Question about 1999 GMC Suburban

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The AC is not cooling and when I check the clutch on the compressor it isn't engaging and turning the compressor.

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  • mikefeldman3 May 26, 2009

    I got the freon and tried checking the pressure and adding. At first it looked like it was taking it but it was really weird. The pressure would read low then after I added it would shoot up to the red but if I pulled the trigger againg it would start to drop back down to low pressure, after about 6 time of going through that cycle it went down to 0 pressure and I have not been able to get it to move. when I pull the trigger it moves the needle a litle but always comes back to 0. I tried that for a long time and it doesn't appear that anything is happening, The can is not getting lighter. The clutch is still not engaging but I can turn it freely by hand. I tried loosening the top from the can of freon to make sure there is pressure and it appears there is. I will check the fuse tonight.

  • its420_us May 11, 2010

    Check your fuse first.

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  • 78 Answers

You must of lost freon and when there is no freon your clutch will not activate.Must check it for pressure in the lines.If there is pressure check pressure switch.Good luck let me know

Posted on May 24, 2009

  • Danny May 27, 2009

    BRO you have to check the pressure on the low side it has to be about 30 psi and on the high side it has to be about 150 psi.If your low side is about 5-15 psi and your high side is over 200-400 you have a bad compressor .Let me know Good Luck

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1 Answer

No cooling effect from ac


the obvious first, check freon... second, check fuses, and finally check that the clutch engages on the ac compressor when turned on (you should here a click and notice a small, momentary difference in the idling of the truck) you can also visually check the clutch by watching the compressor when someone else turns it on. if the clutch is not working, the inner part of the pulley does not spin.

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No electrical power to AC Compressor. The switch light comes on in car when AC power button is turned on.


  1. Check if air blows with the fan setting turned to high.
  2. Check that the radiator cooling fan engages when the A/C button is pressed.
  3. Locate the compressor.
  4. Turn on the A/C.
  5. Check if the compressor's clutch has been engaged.
  6. If the clutch engages, the fault is elsewhere.
  7. If the clutch does not engage, check for power to the clutch.
These steps might help find the problem.

Sep 16, 2013 | 1997 Ford Escort

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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.

Jul 24, 2012 | 1992 Buick Regal

1 Answer

Compressor isnt turning at all dont know if i need new one or if i need new clutch how can i tell


The pulley on the compressor is always running when your engine is running, but the only time
it compresses the freon is when the clutch engages, if the compressor's pulley was not turning,
it would have already snapped a fan belt or your serpentine belt. voltage runs from your fuse box
thru your air condition switch on your dashboard to a low pressure switch that is located at the
accumulator a long cylinder,close to the firewall under the hood or close to the condensor, front
of the car. the switch detects freon pressure in the accumulator, if there is freon pressure, the switch
will stay closed and allow voltage to go to the compressor clutch to engage it and compress the freon,
if there is no freon pressure the switch will open, and there will be no voltage to air compressor, its a
saftey switch to keep your compressor from getting damaged.its possible that the switch could be bad
it may not have voltage at the switch, or it may be open because there is insufficient freon pressure.
check and make sure there is freon in the system.check for voltage at the low pressure switch if you have freon in your system and voltage at the pressure switch, set your ac on high, pull the molex off
the switch, and jump it out with a jumper wire, if the clutch engages and your car starts to cool, just
replace the switch. if the clutch engages but does not cool, then your ac system has some blockage
in the lines. if the clutch does not engage at all then it would be the compressor clutch. good luck!

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We have a 2000 3.0L caravan that we recently bought. The ac belt was off the compressor, so I put that on. The clutch would not engage. So reading online, I decided to bypass my Ac Clutch Relay. When...


i think you need a new compressor which is why the belt was left off ,also the gas is the main lubricant for the compressor as well so running it with no gas hasnt helped either ,best of british with it anyway

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1 Answer

AC blowinghot air


Locate wires coming from compressor clutch and trace to nearest plug that you can unplug. Turn on A/C to max cooling. If clutch not engaged (center of compressor drive pulley not spinning with pulley), unplug compressor clutch wires and use multimeter to check voltage going to compressor clutch. If voltage is around 12 volts or more, then clutch should be engaged when plugged in. Plug clutch wires back in (with motor still running and ac set to max). If clutch still not engaged, then clutch definitely bad because 12V signal should engage it.

May 08, 2010 | 2002 Lincoln LS

1 Answer

My 2002 Expedition air conditioner will sometimes blow hot air and others cold air


I would check the following possibilities:
1. Is compressor clutch working? - You need to do this when the ac is blowing hot air only - locate compressor drive pulley on engine - rubber belt wraps around it. Start engine and set to max ac. When the ac is blowing hot air, look at the center of the compressor drive pulley using a good flash light - watch it for a while, it should be spinning with the pulley - this means the compressor is engaged. If not, the compressor is not engaged. If your ac is blowing hot air, then the compressor should be engaged and running (trying to cool). If it is not engaged, then your compressor clutch is probably going out. Could be low voltage to clutch, but more likely the clutch is worn out and only working some of the time. Note: if working normally, the compressor clutch will engage and disengage in cycles- but the air should always be cold. If clutch is bad, compressor would need to be replaced (sold as one unit). This is tricky to diagnose and could take some time - you need to do it when ac is blowing hot air but set to max cooling.

2. Low on refrigerant or refrigerant has moisture in it? If your ac blows cold initially after being off for a while, then heats up, and continues to regularly cycle back and forth between hot and cool air, then the system may be low on refrigerant or the refrigerant may have moisture in it that is freezing and restricting refrigerant flow. An a/c shop can check refrigerant level and even replace refrigerant if moisture is suspected.

Could be other issues, but I would start with these.

Good luck

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1 Answer

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