I have a 2000 Blazer that has just developed a problem in the A/C.
The cooling is intermittent. Sometimes the compressor will engage
immediately when the truck is started and put out cold air (28 - 32
degree air). Sometimes the compressor will NOT engage for 10 - 20 -
30 minutes and I will get hot air. Then, all of a sudden, I'll get
cold air. It might stay cold for 5 minutes or it might stay cold for
30 minutes - and then turn hot again. There seems to be no rhyme or
reason - sometimes it works and sometimes it doesn't.
I have charged it with refrigerant (134a with oil) and when it cools,
it is REALLY cold.
With the hood up, I can see that the compressor clutch is not engaged
when it is blowing hot air and, as soon as the clutch engages, I get
I don't know much about A/C systems but I'd like to get an idea as to
what might be the cause before I commit to spend major bucks on a 10
year old vehicle.