I have a 95 Tahoe which required pretty extensive air conditioner work last
spring. Had leaks, and it took a new condenser, etc. to the tune of $800.
Now, low and behold, spring 2004 comes along and . . . dead A/C again.
Seems like the panel switch works, but no familiar under hood sound of the
compressor engaging and slightly changing engine rpm. I am hoping this is
not the compressor, cause I am tired of spending big bucks on A/C repairs on
this rig. Any ideas, could it be something simple? Already checked fuses,
Probably the same leak that drained it the first time. There are a few
things that will cause the compressor to not kick on, and low refrigerant is
one of them. The compressor clutch could be shot, the clutch relay could be
shot, the low-pressure switch could be shot as well.
The compressor has a two wore connector, green and black. While the truck
is running, set the controls to Max AC, jump the GREEN terminal on the
compressor directly to the POSITIVE battery terminal, and the BLACK terminal
on the compressor to the NEGATIVE battery terminal. This should engage the
clutch and kick on the AC. If it kicks on and is nice and cold, probably
the low pressure switch. If it kicks on and is warm, probably low
refrigerant. Best bet would be to buy a cheap low-side pressure tester at
Autozone for ten bucks and measure low side pressure (at 2k RPM) with the
I have a '94 6.5tb w/ A/C the A/C will run fine for a couple minutes but
then it will start engaging/disengaging fairly rapidly non-stop with a
loud clicking sound, any ideas? I have just unplugged the power to it for
now. Thanks in advance for any help.
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