Question about 1998 GMC Jimmy

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No cold air

When ac is turned on the Ac compressor kicks on the ac fan kicks on the ac lines get very cold and the housing where the ac fan is is crackes at the top wher i feel very cold air comming out but its still blowing hot air out of the vents

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  • Anonymous Apr 27, 2009

    1999 jimmy,starts to blow cool air then goes to all hot . acts like a door stuck in the box under dash

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Had the same problem. Is it an automatic thermostat? If so, it is the module that opens the air door. It is just inside the glove box. If you look it is probably turning. It is a tight fit, but not hard to fix.

Posted on May 07, 2009

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Air doors stuck broke or not getting vacuum.

Posted on Apr 20, 2009

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1 Answer

COMPRESSER KICKS ON (blows cold)only ON LOW IF YOU TURN BLOWER ON ANTHING BUT 1 the ac light goes out and compressor kicks off, changed the climate control thing and that didn't fix it!!


that sounds like normal operation to me. might be low on charge therefore won't kick in on high speed due to not damaging the system and running the ac compressor to cause damage. have the system checked at a local shop. if ok, then recheck that everything is plugged in. all sensor on the ac lines. sounds like it might even be the low side cut off switch or plugged orfice tube or something along those lines...best left to a professional with a machine where they can monitor pressures, and proper operation and see what's going on.

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83 chevy ac compeser kicks on but no cold air


May just need a recharge, you can buy kits with a gauge at walmart or parts stores, worth a try and a lot cheaper than a $300 compressor.

Jul 21, 2014 | Chevrolet Chevy Cars & Trucks

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07 Nissan Titan blows cold when ac on then after an hour it so it blows warm when I turn the ac off for approx 5 minutes and turn on the it's cold again. On long trips in AZ ac is a must. Help!?


When it starts runing warm check to see if the compressor clutch is engaged and turning the compressor.. Check for lines freezing up.. look for ice where the line(Pipe) GOES THROUGH THE FIREWALL into the evap housing. There is a relay that turns the compressor clutch off at certain times (to save fuel) .. possibly this is malfunctioning.

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My Cadillac 08 CTS will not blow cold air the relay checked out but when I jumped the relay the compressor kicked in and it blew cold air when I put the relay back in I had nothing tried a horn relay...


there are 3 switches that control the operation of the ac compressor . There is a high pressure switch that will not allow operation if the head pressure goes too high ( excessive gas-blocked system-tx valve condenser fan not working )There is a low pressure switch that stops the compressor when the gas has leaked out and is insufficient A thermostat that will not register and so will not switch on the compressor and finally ac compressors will not work unless both the ac switch and the blower are switched on. Have the system checked out by an accredited ac specialists.;l

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AC dead. all the time? truly all times.
1: does the fan blow? full speed.
2: does AC work on a hot day and a cold started engine? y/n
3: did you check the freon pressure, with the cheap refill kit
that has a gauge with the kit and hose.
is the gunge reading zero?
4: you start engine, and open hood and look at the AC compressor.
is the fan belt to that compressor turning, or is the belt missing.
if turning is the AC pulley spinning, that is not just the pulley but the
compressor front part and its main shaft, are they spinning.?
if not the AC clutch is disengaged.
if disEngaged, that means the AC logic box, is not happy.
The AC logic box can shut down the AC for 4 or more reasons.
and to find that , I stop here.
the fsm shows the pins on the logic box to see with logic input is failing.
on my car, its:
1: A/C on , switch is off.
2: fan not on, or power to it dead, no fan the logic cuts the compressor so the core dont freeze up and crack.
3: engine overload
4: engine overheat.
5: freon pressure too high.
6: freon pressure too low.
7: too cold outside, so shuts down , has to be extreme cold, RTM.
at the least. all this logic functions, save fuel and save other parts
from damage. and huge costs.

that is it for today, one more unsolved.

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1 Answer

2004 ford expolorer air conditioning will not stay on


I would suspect the AC compressor cycling switch (located in low pressure line from compressor) or a AC cutoff wide open throttle relay ( in under hood fuse and relay center) would be causing this problem.

Jul 24, 2012 | 2004 Ford Explorer

1 Answer

Compressor and fans do not turn on until rev engine


I passed this question the first time I read it, so I will take a stab at it now.
The fans don't come on until the compressor has pumped the freon pressure up to say 150 or 200 psi. And the compressor clutch has to have voltage to engage the clutch.
I wonder if the clutch is going and needs 14 volts instead of 12 to engage ? Or the relay that powers the clutch ?
Speeding up the engine would increase voltage from the alternator.
This is assuming the serpentine belt is tight and everything else is working correctly.
I think I would swap the relay with another and put a meter on that circuit to the ac clutch to see what it takes to engage it.

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1 Answer

I have a 05 scion tc that the ac compressor will blow ice cold and after a few mins the compressor will kick off. If u turn the ac off for a few mins and turn it back on it will blow cold for a few mins...


may be a few things try checking the a/c lines when it does the shut off thing are they freezing up? may need a dryer. is the fan coming on at the radiator when the a/c comes on? it needs this to keep the head pressure down. does it drip water when the a/c is on under the car? may another sign its freezing up.

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I have a 97 Toyota Camry. The AC has been working great and gets really cold. Yesterday as I am driving the light on the ac power button starts to blink, after about 45 seconds the ac turns off and stops...


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