Question about 2002 Chevrolet Impala

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A/c is not cooling there is a new compressor, clutch, and dryer on it. is there a sensor that would make it not cool

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  • Christopher Foulkes May 11, 2010

    Is the compressor turning on or cycling when you turn the a/c on?

  • Anonymous May 11, 2010

    Who did the repairs and why? What were the original complaints?

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1. The system should have bee Evacuated after installing all the new parts to remove natural atmosphere air.
2.The system should have then been recharged to the containment quantity of Freon, usually about 3 lbs, having added 3 fl. ozs. of PAG oil to lubricate the Compressor vanes.
Then the system is run up, on Max A/c and full blowers with the vent controls set as desired, engine RPM about 1000, and the COMPRESSOR CLUTCH SHOULD BE ROTATING, If the system is correct, then the Lo pressure return pipe will be cold, cold. If
not you will have to look for other causes, Broken belt, faulty Fuses and Relays, Thermostat in the Evaporator, Holed Conderser. Joint seals that were separated during the rebuild, wich should have been replaced at the time.
Best of luck in your efforts.
Regards, DT

Posted on May 10, 2010

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Are you sure the system is turning on. You may have a relay that went out when your compressor was changed. Has it properly been charges. A lot of these systems need to be vaccumed before charging.

Posted on May 10, 2010

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Sounds like you popped a hole somewhere and coolant has escaped to the point where system is now undercharged. When that is the case the low pressure sensor prevents the AC clutch from activating, hence no cooling.
The compressor is cooled by the return gases and when they are insufficient, there is no cooling for the unit and the sensor activates to prevent destroying the compressor.

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The accumulator or dryer looks like a long cylinder, it has a pressure switch on it and two wires attached to it. pull the wired molex off, with the ac set on max cooling, jump out the two wires with a wire or paperclip, if the clutch on the ac compressor engages, check the cab to see if its cooling, if it does cool the switch needs to be replaced, if it does not cool, you may need freon, and there could be a sign of a leak in your system, that can be best checked with ac manifold guages. the low pressure switch is there for safety if the canistor or accumulator is low or has no freon the switch opens up and keeps the clutch from running so that the compressor will not burn up. good luck!

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A/C compressor replaced, now A/C does not cool properly. Had to take it back twice to original Repair shop to cool car insidethen took to new repair shop & installed dryer (don't know why first...


did the old pump burn up or was it just the clutch? If it locked up or had a lot of damage it will fill the lines with debris. If so the engine system needs flushed and change the orfice tube.
also check your pressure readings on your high and low side. do you have rear air?

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Whenever I turned on the air condition in my Ford Explorer 2006, after few second the radiator Fan start running very frequently on high speed making noise. When the fan starts on high the rpm of the...


The cooling fan is supposed to come on when the /ac compressor clutch cycles on, and off when it cycles off.
The idle speed kicks up to compensate for the additional a/c compressor load and the additional alternator load. usually, just the low speed comes on until it hits a much higher temperature.

the system should cycle 4 to 7 times/minute at 79 degrees F.

Here are some things to consider:(The PCM (engine computer) is NEVER defective, don't replace it). I don't think it is the ECT (engine coolant temp sensor) or the Cylinder Head Temp Sensor. Or the VSS or the MAF sensors.


The electronically controlled fan clutch is controlled by the powertrain control module (PCM) based upon requests for airflow to cool the engine, transmission and A/C condenser. If no cooling is required, the electronics permit the fan to spin at a slower speed yielding improved fuel economy.
-------------------------------------------------------------------------------------------------------------------------------
Inoperative or damaged:
  • Electronically actuated fan clutch
  • Electronically actuated fan clutch controller
  • Wiring, connectors, relays or modules
  • Engine Coolant Temperature (ECT) sensor (4.0L SOHC)
  • Cylinder Head Temperature (CHT) sensor (4.6L [3V])
  • Mass Air Flow (MAF) sensor
  • Vehicle Speed Sensor (VSS)
  • ----------------------------------------------------------------------------
If the cause is not visually evident, connect the scan tool to the Data Link Connector (DLC).
Retrieve any DTC Codes (Diagnostic Test Code). Autozone will do for free.

--------------------------------------------------------------

The cooling fan clutch actuator valve controls the fluid flow from the reservoir into the working chamber. Once viscous fluid is in the working chamber, shearing of the fluid results in fan rotation.

The cooling fan clutch actuator valve is activated with a pulse width modulated (PWM) output signal from the powertrain control module (PCM). By opening and closing the fluid port valve, the PCM can control the cooling fan clutch speed. The cooling fan clutch speed is measured by a Hall-effect sensor and is monitored by the PCM during closed loop operation.

The PCM optimizes fan speed based on engine coolant temperature (ECT), engine oil temperature (EOT), transmission fluid temperature (TFT), intake air temperature (IAT), or air conditioning requirements. When an increased demand for fan speed is requested for vehicle cooling, the PCM monitors the fan speed through the Hall-effect sensor. If a fan speed increase is required, the PCM outputs the PWM signal to the fluid port, providing the required fan speed increase.

-----------------------------------------------------------------------------------


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1 Answer

No a/c not cooling at all it does cycle on and off the compressor turns on and off just charged has dual heating and cooling controls blend door sounds like it is working but only after you turn it off...


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1 Answer

My ac wont get cool.......it blows hot air and(caddy seville 95)


Below is a guide to troubleshoot and check system function. This can be done by most folks.

Look at the front of the ac compressor and have someone turn on the ac from inside the car. The front of the pulley(clutch) will spin when turned on.

If it does not spin, the low pressure switch (LPS) is not satisfied. Meaning there is not enough freon in the system to operate the system. Means low freon capicity because of a leak.

The LPS can be jumpered to cause the compressor to run (clutch to engaged) which will draw the freon in the system.

The LPS is usually a two wire sensor on the suction of the compressor. (between evaporator and compressor) Unplug the sensor and install a jumper, this will engage the clutch. Connect a new can of freon
and fill to system capacity.

The capacity of the ac system will be on a label under the hood, do not overfill. Probably about 2 lbs. Local parts stores (Auto Zone and Advance) will have freon with stop leak. This may help the leak. They also make a freon with a UV dye. I always add a single can with dye so that if stop leak does not work I can find the leak in the future.

The system should be filled until suction pressure is about 30 to 38 psi..

Remember the flow for the a/c system is :
1. From the compressor a high pressure (HP) gas goes to the condenser in front of the radiator.
2. From the condenser a HP liquid goes to an expansion device (orifice tube or expansion valve)
3. From expansion device the low pressure gas enters the firewall to the evaporator.
4. From evaporator the low pressure liquid/gas mixture goes through the dryer2_bing.gif back to the compressor suction.

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3 Answers

The car has been sitting for almost a year. I started it today to drive out of necessity. The A/C clutch does not engage. How do i jumper across the pressure switch to add freon? Thanks, Ken


dont!!! an you start to add freon, itll start to cycle the compresor clutch until within safe operating pressure and then it will hold clutch in constant. charge liquid(with can upside down). if wont take freon in this manner than your more than low on charge. running low on charge will quickly destroy pump, especiallt those old harrisons. the refrigerant also cools the compressor. good luck and wear gloves-

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1 Answer

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Save your self some money and just get the system evacuated & recharged, there is no point in putting a clutch in (IF) the system is keeping cool now. You never want to put a clutch in with out the compresor anyway.

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