Air condition not working

Hi mecarchaser,

Does the compressor cut in and out with any or specific blower fan speed mode with A/C switch turned off? Was any repairs carried out prior to this occurring?

HVAC is an acronym that stands for the closely related functions of "Heating, Ventilating, and Air Conditioning"

First diagram shows an automatic HVAC control panel.

Something has caused the compressor to come on when the blower motor is turned on.

What is the engine capacity for your vehicle?

Blower motor is the heater fan.

Did you try swapping the A/C clutch relay?

The A/C compressor clutch relay is grounded by the PCM and it could possibly be faulty. Check all ground circuits for proper and clean conditions.

Does the A/C compressor kicks in and out when the blower is not turned on?

To check for a bad gound, the easiest way is to use an ohmmeter. Push probe to a well grounded location and use the other probe on any ground wire that you wish to test. Anything more than 1 ohm should be cleaned and retightened.

It might not be a ground circuit connection but a faulty Power Control Module or a leaking vacmun line.

The A/C compressor relay is activated by the PCM and if it is kicking n and out, the PCM is either faulty or it is getting the wrong signal from somewhere.

The heater fan should not turn the compressor on unless it is shorted to the circuit.

Here is a wiring schematic. Note the location of the ground circuits that should be checked. Check out the diagrams (Below). Please let us know what you find.