02 2.2 Sunfire A/C problem

[raustin]

pressure is high when I use a refill gauge, compressor is cycling on/off/on very frequently and sounds "labored" when it comes on.

Am i looking at a blockage (like in the orifice tube) or possibly the pressure switch ?

I have all new parts on order but dont want to install the high dollar parts unless I need to.

Russ

 

[raustin]

Hmm - ok, this has developed a little, last night I replaced the compressor, orifice tube and drier. The fault remains the same - I am going to install a new Hi Side pressure switch this evening. Any offering of wisdom would be very much appreciated at this point.

 

[raustin]

Hi Side pressure switch replace, the situation has improved - slightly, but I now find that the radiator fan is not starting, runs when flicked by hand though - replacing that tonight. Weird thing is that the motor only costs $150 from Pontiac dealer, $65 for the complete assy from the breakers yard and $36 for the motor only from Checker Autoparts - guess where i am going

 

[Chowawa]

The radiator fan is the cause of your A/C problem. You should check the relay/breaker (the big one towards the back of the car).
You can swap the relay with the other one and if the radiator fan work, then it's the relay.

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[wde3477]

Agree with Chowawa for the radiator fan being the leading culprit at this point. It should kick on in short order after the A/C is engaged, regardless of engine temperature. Without this fan, the system cannot shed the heat, causing high high-side pressures which will activate the high-side kick-out switch.

One check would be to get going down the highway, where the fan isn't really needed. If the A/C works OK or much improved here - heightens confidence the fan or related circuitry is the problem.

The proper amount of freon is essential - too much or too little will cause problems also.