Question about 1998 GMC Suburban

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Need electrical schematic for 1998 Suburban ac system, has rear ac, no power to clutch, power to high and low presure switches

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Could be something to do with the rad fan relay or reostat ,if fan doesnt work then ac clutch will not kick in

Posted on Sep 11, 2009

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My 1998 is Izusu trooper AC button is not lighting up what could it be? no AC. (added punc)


check fuses and relays --a few reasons no power -low or no freon --compressor bad --climate switch bad --loose or damaged wiring

Sep 08, 2016 | 1998 Isuzu Trooper

1 Answer

97 chevy suburban AC clutch won't engage pressures


Looks like the low pressure switch gets power from a 10amp ac fuse. Power then goes to the ac relay which is powered on by the ac heat controller on the dash. Power then goes thru the high pressure switch to the compressor. The ac relay is grounded to the body. Do you have power on the lite and dark green wires going into the relay and is it grounded ?

Jul 26, 2013 | Cars & Trucks

1 Answer

How jetta compressor clutch work


Ac compressor clutches get power from a relay via pressure switches.
If the system is low on freon, the low pressure switch prevents the ac clutch from engaging.
The clutch is a magnet.

Jul 05, 2012 | 1998 Ford Windstar

1 Answer

AC not running in my 1998 Jeep Cherokee. Changed AC clutch compressor RELAY, freon level is good, temperature sending unit replaced along with cooling fan! Checked all fuses still good. Can't seem to...


Hello, You have two switches which work off the pressure of the Freon. Both of these switches cut off the power to the compressor. One is for HIGH pressure and the other is for LOW pressure. Check for power at the compressor clutch connector harness while the controls are set and the engine is running. You may have power and a bad clutch.

When you say that the Freon pressure is good, does that mean the pressure is within the proper range? Too much Freon will make the HIGH switch cut off power and too little will make the LOW pressure switch cut off power.

The ideal amount(ozs) of Freon is what is recommended by the Manufactuer and it will provide a moderate amount of pressure of about 35psi-40psi. You can borrow pressure gauges, called Manifold gauges to measure your system at autoparts stores with loaner programs.

The low pressure side of the system is the one you use to induce the Freon to go into an empty system. You can bypass this switch by taking off the connector and putting a "U" shaped jumper into the harness and the compressor clutch should get power to LOCK up all of the time.

You can take off the switch connector at the compressor clutch and then check for power when bypassing the HIGH pressure switch if the LOW pressure switch does not make the system get power. Only, really only bypass the HIGH pressure switch with the clutch connector disconnected. The HIGH switch is there to prevent damage to all of the components from seals to lines to every piece of Freon hardware in the car. Bypassing with the A/C clutch disconnected will allow you to know if power is getting to the compressor clutch.

Finally, you can get FREE wiring and fusebox diagrams through Autozone.com. Just sign and register to their site and then you can print the documents for yourself.

Good luck with this repair and I hope my solution helps you.

Mar 19, 2012 | 1998 Jeep Cherokee

1 Answer

Location of expansion valve on 2001 suburban. Blow warm rear.


The rear expansion valve is connected to the evaperator. I hope this helps.
Thank You,
Roy

Aug 09, 2009 | 1995 Chevrolet Suburban

1 Answer

I need a wireing diagram for the ac on a 1991 Chev PU. Clutch does not kick on. Power at fuse- no power at the tank or at the clutch. Thanks Anne


If the AC system is too too low or too high in system pressures, A safety switch interupts the power to the compressor to protect it. Have you system ck'd befor wasting time figuring out a wiring diagram that will end up telling you to have it ck'd at a shop. Good luck

Jul 11, 2009 | 1999 Chevrolet Suburban

1 Answer

I have a 99 chevy suburban and i dont know witch


most of the time this wont be the case ,,,this has a ht6 compressor,bad to leak,,look for low freon levle and check low presure switch and high presure switch and connector,high side switch is on back of compressor,check to see if bad connector or bad switch/these are in series with one another ,before clutch activation

Jul 05, 2009 | Chevrolet C1500 Cars & Trucks

1 Answer

The ac is blows but the air is not cold.... the compressor is working the ac clutch may not be engaging


if refrigerating system low in presure(low refrigerator level)presure sensor wil not send signal to engage clutch...the second think if system under normal pressure check electrical connectors if they ok,a/c compressor is faulty.

Jun 14, 2009 | 2001 Chevrolet Silverado 1500

2 Answers

A/C wil not work


if your low on freon the unit will not work.low pressure switch cuts it off. or you have a bad a/c clutch asy.

Jun 12, 2009 | 2004 Hyundai Santa Fe

1 Answer

1998 cadillac deville reads service ac system


Hi,check if the compressor clutch is engaging,if not check the conection at the compressor if ok check,fuse ,or relay ,if those are fine and the commpressor is engaging,check freon presure ,may be too high or low, if this is the case ,correct the problem and disconect the negative cable from the battery for a minute to reprogram the sistem..C1

Jan 04, 2009 | 1998 Cadillac DeVille

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