My A/C blows hot air as often as cold. I can see the compressor clutch engage and the accumulator gets cold as heck....but hot air comes out of the vents. Then all the sudden it's cold. A couple minutes later it's blowing hot again. Then cold, then hot. No lukewarm. Nicely cold then full on 95deg summer heat.

Dash temp switch set to full cold so it should have kept blowing cold. Compressor clutch action doesn't synch with hot/cold cycles. Near as I can tell the compressor clutch engages as soon as I turn on the AC and it stays on.

Ideas?

 

Vacuum leak, and temp door acting strange.

 

have u checked the blend door?

 

if the compressor clutch is disengaging, then that's your problem. if will disengage whenever pressure is too high, or too low - due to over or under charge.

if the compressor is running continuously, but the temp is not cold or swings cold/hot, then it MIGHT be the blend door opening up to the heater core, or, it might be a malfunction with the ac components - expansion valve, orafice tube, or accumulator.

if the compressor is running, then everything on the low pressure side should be ice cold and stay that way. we recently had a jeep ac act up and be only half-cold. it was a bad expansion valve.

 

Where and what is the expansion valve? Sorry in advance for not knowing.

 

expansion valve is a square box looking thing, just off the firewall. its the first step of the conversion of the refrigerant from liquid to cold gas. it can malfunction and interfere with the flow of the refrigerant. our trucks don't have one.