Depending on the configuration, Lacetti can be equipped with or without air conditioning.

Lacetti air conditioner is charged with the most common refrigerant R-134a

Refrigerant charge: 670 g ± 20 g

Compressor oil Isupag 513

Oil filling volume: 220 ml.

All this data can be found on a plate under the hood of the Lacetti, to the left of the castle.

How to turn on the air conditioner on the Lacetti

The air conditioner is switched on by pressing the "A / C" button on the heater control unit. Set the air temperature regulator to the blue zone so that cool air begins to flow. To prevent the windows from fogging up, it is also necessary to use an air conditioner. It will dry the air inside the car.

Air conditioning system device

Before listing the device, let's make an understanding of the principle of operation of any air conditioner. Since, in general, they are all similar in design.

The principle of operation of the air conditioner is based on the properties of liquids to release heat during condensation and absorb during evaporation. In this regard, the air conditioning system includes:

Air conditioning compressor. Its task is to compress freon and move it along the refrigeration circuit. The compressor is driven through a belt from the engine, but it does not work constantly, but by engaging an electromagnetic clutch.
Capacitor. It is a radiator in shape, made of aluminum. In it, freon passes from a gaseous state to a liquid. The same condensation process
Evaporator (in the form of a radiator, made mainly of aluminum). In the evaporator, on the contrary: freon passes from a liquid to a gaseous state. This is the evaporation phase.
Thermostatic expansion valve (TRV). It serves to lower the freon pressure in front of the evaporator
Air conditioner fan. Designed to enhance heat transfer with the environment.
Low and high pressure connecting pipes. Serve to create a closed loop of the system and circulation of freon through it.

Features of the Lacetti air conditioning system

The features include the operation of the compressor, or rather the operation of the electromagnetic clutch. It is controlled not only by pressing a button on the heater control unit, but also by the electronic engine control system (ECM). The ECM receives data from the air conditioning pressure sensors and from various engine systems that affect the engagement of the electromagnetic clutch. For example, the ECM can disable the clutch when:

wide open throttle
high temperature of antifreeze in the cooling system
low or high freon pressure
high engine speed

During normal operation of the engine systems, the compressor clutch will be engaged.

Why the air conditioner does not work on the Lacetti

When you press the "А / С" button, the button indicator does not light up (nothing happens). In this case, the problem is with the button contacts or the board. It is necessary to solder the contacts with a soldering iron, or replace them (buttons, or boards). According to reviews on the forums, this breakdown is a "disease" of the Lacetti.
When you press the "A / C" button, the indicator lights up, but the click of the clutch under the hood is not audible. The air conditioner fan does not turn on, the cold does not come in. The ECM does not allow the air conditioner to turn on, most likely the problem is a broken wiring, or high-low pressure in the air conditioning system. It is necessary to check the pressure in the system at the service station and bring it back to normal.
When you press the "A / C" button, the indicator lights up, but the click of the clutch under the hood is not audible. The engine speed "sags", the fan turns on, cold air does not come in. In this case, there is a possibility that the air conditioner compressor is stuck and does not turn, therefore the engine speed "sags". Turn off the air conditioner. It is also possible that the wiring is to blame. In this case, it is necessary to check the fuse F6 in the passenger compartment, Ef17 in the engine compartment and the operation of the compressor relay. If these manipulations did not help, then check the connector at the compressor clutch (for more information about the Chevrolet Lacetti fuses, read the article :).
When you press the "A / C" button, the indicator lights up, a click of the compressor clutch under the hood is heard, a slight cold comes in, and noise is heard in the glove compartment area. Here the problem is most likely a lack of refrigerant. It is necessary to check and, if necessary, refuel the system.
When you press the "A / C" button, the indicator lights up, you hear a click of the compressor clutch under the hood, the cold begins to flow only after a long time. This situation occurs due to low pressure in the system, since after prolonged operation, the air conditioner still starts to work. Need to refuel the system and check for leaks.
When you press the "A / C" button, the indicator lights up, a click of the compressor clutch under the hood is heard, cold begins to flow and after a while the air conditioner turns off. The problem is in the overpressure in the system, or in the pressure sensor in the air conditioning system.
When you press the "A / C" button, the indicator lights up, a click of the compressor clutch under the hood is heard (the compressor works without extraneous noise). The system is filled, but there is no cold, and the pressure values in both circuits are the same, then most likely it is out of order control valve (article number 96813684).

Refrigerant Leakage Lacetti

Before filling the Lacetti air conditioning system with R-134a refrigerant, it is advisable to find out where it leaks. In order not to refuel every year.

Frequent refrigerant leaks:

High and low pressure piping connections to the compressor. Be sure to replace the O-rings ( article number 94580424 or №94525304 ).
Place of connection of pipes to the evaporator
Filling nipple marked "H" on the cap.
Capacitor. There is a possibility that it could have been pierced by flying stones.
A / C compressor shaft oil seal ( article number 9118305)

If the Lacetti air conditioner does not work, then there are usually two reasons for this, which we will consider in this article.

Why the Lacetti air conditioner does not work

So, if the air conditioner does not turn on on your Lacetti, then two reasons are possible:

If, when the air conditioner button is turned on, the indication on this very button does not light up, then 99.9% of the button block must be soldered. This is detailed in. This is a well-known Lacetti problem. It is not difficult to eliminate it yourself.
If, when the button is turned on, the indication lights up, but the Lacetti air conditioner still does not work, then, most often, this is an insufficient amount of refrigerant in the system.

With this problem, I advise you to immediately go to the service station, and not try to figure it out yourself. By the way, it is not so difficult to figure it out, but you will not be able to fill the air conditioner system CORRECTLY on your own.

The network has instructions for refueling air conditioners yourself from cans to control the pressure on the manometers. But this is an incorrect refueling.

Remember: In the car air conditioning system, the weight of the refrigerant is important, not its volume and pressure!

You can open the hood and look at the sign, which is located to the left of the lock

It clearly and clearly states how much GRAM of R-134a refrigerant is needed

In order to properly charge the air conditioner, you must first pump out all the refrigerant from your car, and then just pump it back in as much as it should be!

Can you do this at home? I doubt. Unless, of course, you are not an ardent fan of doing everything yourself and can buy expensive equipment in your garage to refuel the air conditioner every 2-4 years.

Now almost any self-respecting service station has equipment that will automatically pump out all the refrigerant from the car air conditioner, pump in as much as needed and issue a check.

When my air conditioner no longer wanted to work, I immediately went to the service station, since I had already soldered the control unit and I was sure that everything was in order with it, and in the Chevrolet Explorer program, the pressure in the air conditioning system began to show less than usual.

At the service station, a miracle device was connected, which pumped out everything that my air conditioner had and evacuated the system.

We refueled as needed and checked for leaks. No leaks were found, and there was not enough refrigerant because I had never charged it before. As they say, time takes its toll.

This business cost me $ 18. and hour of time.

Advice: Do not leave the air conditioner idle for a long time, turn it on at least once a week, even in winter. This will extend its service life.

Peace to your home and good luck on the road!

The control module was installed on the Lacetti for this car from 2003 to 2008.

In the catalog of original spare parts for the Lacetti it goes under the number: 96615408 .

You can find out the price and photo on this page. The part comes with an air conditioner button. The button is not sold separately. If you have any questions, please contact our specialist by phone.

Reasons for the failure of the heater:

The air conditioner heater control units fail due to their design features, if your cable breaks, it can still be repaired, the main thing is that the place of its attachment directly to the module is not damaged. More often than not, the plastic cable holder breaks down on the unit. If in your heater the cable attachment to the switch has come off, then it will not work, the part is not suitable for repair, more precisely, it is possible to repair it, but it will not be enough for a long time. And staying in winter or summer without air conditioning is not the most pleasant thing. Therefore, 96615408 must be replaced as a whole. We provide a standard 180-day warranty on ours. We do not recommend buying a used Chevrolet Lacetti control unit, it will be difficult to determine the state of attachment to the switch by eye, and therefore to identify the current wear of the part.

Air conditioning system: 1 - evaporator; 2 - reducer; 3 - low pressure pipeline; 4 - refrigerant pressure sensor; 5 - valve for charging and discharging refrigerant; 6 - capacitor; 7 - receiver; 8 - compressor; 9 - high pressure pipeline

Common components of a heating, ventilation and air conditioning system

Electric fan.
Heater hoses.
Fan resistor.
Fan high speed relay.
Heater / Air Distributor Housing Assembly (Air Conditioner Module).
Heater heat exchanger.

Air conditioner pressure sensor.
A / C compressor relay.
Air filter.
Air conditioner expansion valve.
High pressure line of the air conditioner.
Evaporator heat exchanger.
A / C suction hose assembly.
Discharge hose from A / C compressor to condenser.
Compressor.
Capacitor.
Receiver drier.

Air conditioning V5

The variable capacity v5 compressor, together with the expansion valve on the evaporator, is basically a self-regulating system. It does not have an intermittent pressure switch, a high pressure cutout switch, and a low pressure cutout switch. The compressor clutch is controlled by the engine electronic control module (ECM), which receives data from various engine systems and a pressure sensor located in the high pressure refrigerant pipe. During normal operation, the clutch is engaged continuously. If one of the monitored conditions is violated, the ECM will disengage the compressor clutch until normal operation is restored. These conditions include the following:

Wide open throttle.
High engine coolant temperature.
High engine speed.
Low refrigerant pressure.
High refrigerant pressure.

The compressor clutch will remain disengaged until normal operation is restored.

System Components - Functioning

Compressor

All compressors are driven by a belt from the engine crankshaft through a compressor clutch pulley. The compressor pulley rotates without rotating the compressor shaft until voltage is applied to the electromagnetic clutch solenoid. When voltage is applied to the clutch solenoid, the driven disc and clutch hub assembly is pulled back toward the pulley. By the force of an electromagnet, the driven clutch disc and the pulley are combined into one unit that rotates the compressor shaft.

When the compressor shaft is driven to rotate, the low pressure refrigerant vapor from the evaporator is compressed into high pressure and high temperature vapor. The compressor oil used to lubricate the compressor is carried along with the refrigerant. See "Air conditioning compressor overhaul v5" in this section.

Condenser heat exchanger

The condenser assembly in front of the radiator consists of a coil through which the refrigerant flows and cooling fins for fast heat transfer. The air passing through the condenser cools the high pressure refrigerant vapor and causes it to condense into a liquid state.

Expansion valve

The expansion valve is located next to the evaporator coil on the passenger side firewall.

The expansion valve can fail in one of three positions: open, closed, or flow restriction.

An expansion valve that fails open will cause A / C compressor noise or no cooling. This could be due to a broken spring, a broken ball, or excessive moisture in the air conditioning system. If a defect in the spring or ball is found, the expansion valve must be replaced. If excessive moisture is found in the air conditioning system, the refrigerant must be recharged.

An expansion valve stuck in the closed position causes low suction pressure and no cooling. The cause may be a failure of the dome drive or excessive moisture in the air conditioning system. If a defect in the expansion valve dome drive is found, the expansion valve must be replaced. If excessive moisture is found in the air conditioning system, the refrigerant must be recharged.

Restricting the flow through the expansion valve causes a drop in suction pressure and no cooling. It can be caused by a blockage in the refrigeration system. If it is suspected that the cause of the problem is a blockage, it is necessary to recharge the refrigerant, replace the expansion valve and the receiver-dryer.

Evaporator heat exchanger

An evaporator is a device that cools and dries air before it enters the vehicle interior. High pressure liquid refrigerant flows through an opening in the expansion pipe and is converted to low pressure gas in the evaporator. The heat of the air passing through the evaporator heat exchanger is transferred to the cooling surface of the heat exchanger, which cools the air. Since the process of transferring heat from the air to the surface of the evaporator heat exchanger takes place, moisture from the air condenses on the outer surface of the evaporator heat exchanger and is discharged outside as water.

Receiver drier

A sealed receiver / drier assembly is connected to the condenser outlet tube. It serves as a refrigerant reservoir, receiving both liquid and gaseous refrigerant and compressor oil from the evaporator.

At the bottom of the receiver drier is a desiccant to remove any moisture that may enter the system. Near the outlet pipe of the receiver-drier there is a drain hole for the oil returning to the compressor. The receiver-drier is serviced only as a complete unit.

Heater heat exchanger

The heat exchanger of the heater heats up the air before it enters the vehicle interior. The engine coolant circulates in the heat exchanger to heat the outside air passing through the fins of the heat exchanger. The heat exchanger operates continuously and can be used to regulate the temperature of the conditioned air in air conditioning mode, as well as in heating and ventilation modes.

System components - control

Regulator

The air conditioning system is controlled by switches and levers on the control panel. The compressor clutch and fan are electrically connected to the wiring harness control panel. In the off position (off), the fan circuit is open. In other modes, the air flow is provided by four fan speeds. In the modes maX (maximum), normal (normal), bI-level (two-level) and defrost (removal of frost), cooled and dehumidified air is supplied.

The temperature is regulated by the temperature regulator on the control panel. This regulator is connected by a cable to a temperature flap that regulates the air flow through the heater heat exchanger. When the temperature regulator is rotated within the working stroke, the sliding clamp on the cable at the junction with the temperature flap should take such a position that will ensure the fixation of the temperature flap in both extreme positions. The position of the temperature flap is independent of the mode switch. On some models, the temperature flap is electrically controlled, without the temperature control cable.

On some vehicles, the engine cooling fan is not part of the A / C control system, but the fan runs continuously when the A / C switch is in the maX, normal or bI-level positions. On some models, the engine cooling fan runs when the switch is in the defrost position. This additional function is part of the A / C control system and is designed to prevent excessive compressor temperature rise. It also improves the efficiency of the air conditioning system. On some models, the engine cooling fan is turned off when traveling at speeds above 56 km / h (35 mph) when there is sufficient airflow through the condenser coil for effective cooling. Cooling fan operation is controlled by the powertrain controller (pcm) or ECM (ECM) through the cooling fan relay.

Pressure meter

The pressure sensor acts as a high and low pressure cut-off switch in conjunction with a fan intermittent switch. The pressure sensor is located on the high pressure liquid line near the front right strut and air filter.

Temperature control keys

To increase the temperature of the air entering the vehicle interior, press the upper button with the red arrow pointing up.
To lower the temperature of the air entering the passenger compartment, press the lower button with the blue down arrow.
The air mixing flap is electrically controlled.
The temperature is controlled by mixing the air passing through the heat exchanger of the heater with the air passing through the heat exchanger.

Each press of the key changes the set temperature in 0.5 ° c (1 ° f) increments. It is shown on the temperature indicator of the function display.

Functional display

It is a liquid crystal display showing the status of the selected control parameter. The indicator displays (from left to right) the following parameters:

Preset temperature - shows the temperature set by the temperature controller.
Automatic control status - shows in which mode the system is operating (automatic or manual).
Heated glass icon - indicates manual activation of the full heated glass mode.
Mode - the mode activated by the system in automatic mode (or by the driver in manual mode) is displayed by luminous arrows showing the direction of air distribution.
Air conditioner - The snowflake icon indicates whether the air conditioner is on or off.
Fan Speed - Indicates the fan speed with glowing bars, starting with one at the lowest speed and adding segments sequentially up to the fifth at the highest speed.

Eight extra keys

Fully heated windows - electric shutter motors direct all air to the windshield and outlets on the windows for the fastest removal of frost from the glass.
Air Supply - toggle between fresh air supply (initial state) and recirculated air. The air flow arrows indicate which mode is on.
Automatic mode switch - the set temperature is maintained automatically. In this mode, the automatic temperature control (fatc) controls the following elements:

Electric actuator of the air mixing flap.
Electric drive of the mode damper.
Electric fan speed.
Electric intake air damper.
Turning the air conditioner on and off.

Main switch - turns off the automatic air conditioning and ventilation system.

Mode Switch - Allows you to manually set the airflow direction.

The selected mode is shown on the function display.
Each time you press the mode switch key, the next function is displayed.

Air conditioner switch - allows you to manually turn on and operate the air conditioner.

Fan Control Switch - Allows you to manually set one of five fan speeds.

Heated glass switch - Turns on the heated rear window and outside rearview mirrors if the vehicle is equipped with heated mirrors.

Wide Open Throttle (WOT) Compressor Shutdown

When accelerating at full throttle on vehicles equipped with multipoint injection (MPI) systems, the throttle position sensor (TPS) sends a signal to the pcm or ecm controller, which controls the compressor clutch.

Air conditioner turn-on delay relay

On some vehicles, this relay controls the activation of the entire air conditioning system and provides a short delay in the activation of the air conditioner after starting the engine.

Compressor V5 - general description

Mounting and installation may differ from vehicle to vehicle with V5 compressors, but repair procedures are the same.

Before dismantling the compressor or carrying out repair work on the vehicle, the compressor connections and the area around it must be cleaned.

Important: After removing the compressor from the vehicle for service, drain the oil by opening the oil drain plug. In addition, suction and discharge oil must be drained to ensure complete drainage. Measure and record the amount of oil drained. Dispose of used oil and charge the compressor with the same amount of fresh polyalkylene glycol (PAG) compressor oil.

The compressor is removed from the vehicle unless otherwise specified.

For proper maintenance, a cleanliness of the tools and work area is essential. Do not allow dirt and foreign materials to get on or inside the compressor. Parts to be re-installed must be cleaned with trichloroethane, naphtha, Stoddard's gasoline, kerosene or an equivalent solvent. Dry the cleaned parts with clean compressed air. Use only a lint-free cloth to wipe parts.

Compressor V5 - Functional Description

The v5 is a variable displacement compressor that can meet the needs of the vehicle's air conditioning system in all conditions without intermittent shutdown. The main mechanism of the compressor is a swinging disc with a variable angle of inclination and five cylinders located around the circumference. The centerpiece of the compressor capacity control is the bellows-driven pilot valve located in the rear compressor cover. The position of the control valve is determined by the compressor suction pressure.

Oscillating disc angle and compressor capacity are determined by the difference between suction and crankcase pressure. When the compressor air conditioner requires high power, the suction pressure will be above the threshold. The valve maintains a flow from the crankcase to the suction line. If there is no pressure difference between the crankcase and the suction line, the compressor has maximum capacity.

When the power demand of the air conditioner is lower and the suction pressure reaches a threshold value, the valve allows exhaust gas to flow into the crankcase and closes the passage from the crankcase to the suction chamber. The swing disc angle is determined by the balance of forces across the five pistons. A slight increase in the pressure difference between the crankcase and the suction line creates a total force on the pistons that moves the swinging disc around the pivot axis, reducing its angle of inclination.

The compressor has a unique lubrication system. The flow from the crankcase to the suction line is directed through the rotating wobble plate to lubricate the wobble disc bearing. The rotating disc acts as an oil separator, removing some of the oil from the crankcase into the suction line and redirecting it to the crankcase where it lubricates the compressor mechanism.

Wide open throttle compressor shutdown (wot)

When accelerating at full throttle, the throttle position (tps) sensor sends a signal to the ECM that controls the compressor clutch.

Shutdown at high rpm

When the engine speed reaches its maximum limit, the ECM disengages the compressor clutch until the engine decelerates.