Question about Cars & Trucks

1 Answer

97 chevy suburban AC clutch won't engage pressures

Posted by on

Ad

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Top Expert:

    An expert who has finished #1 on the weekly Top 10 Fixya Experts Leaderboard.

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

  • Cars & Trucks Master
  • 21,873 Answers

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 ?

Posted on Jul 26, 2013

Ad

6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
New users get 2 Free calls (no credit card required) and instant help on almost anything you can think of (from cars to computers, appliances, handyman, and even pets).
click here to download the app (for users in the US for now) and get all the help you need.
Goodluck!

Posted on Jan 02, 2017

Ad
  • 2 Answers

SOURCE: ac compressor

take it to the deeler

Posted on Aug 23, 2008

ftw1952
  • 10319 Answers

SOURCE: 99 Suburban A/C Not working

The A/C pressue switch may be bad as well. Also the mode switch on the control head inside the vehicle. There are many other exsisting problems pertaining to a/c. I suggest a manual from Auto Zone for many faults can be noted especially wiring can be at fault

Posted on May 23, 2009

  • 323 Answers

SOURCE: clutch won't engage on air conditioning compressor

The air gap may be too wide between the clutch disc and plate. It usually happens from wear. You can test this possibility by engaging the clutch electrically as you have done and then push on the disc slightly with the handle of a hammer or screwdriver. Be careful not to get your hand or fingers too close while the engine is running. Basically you are helping the magnetic field pull the disc in. I hope this helps.

Posted on Aug 19, 2009

  • 14036 Answers

SOURCE: 2001 chev tahoe has no power at a/c clutch checked

IF YOU HAVE 100 PSI ON LOW SIDE.YOU HAVE A EXCESSIVE AIR AND MOISTURE IN THE SYSTEM.YOU HAVE TO HAVE SYSTEM DISCHARGED AT AC SHOP OR DEALERSHIP.YOU HAVE TO REPLACE ACCUMULATOR OR RECEIVER DRIER.HAVE SYSTEM EVACUATE.THEN RECHARGED.SEE YOUR AC IS NOT TO COME ON LONG AS YOUR LOW SIDE TO HIGH.YOUR LOW PRESSURE SWITCH. IS NOT GOING TO CLOSE CIRCUIT TO TURN ON COMPRESSOR.UNTIL PRESSURE DROP AT A CERTAIN LOW PRESSURE.

Posted on Aug 25, 2009

reisdos
  • 1297 Answers

SOURCE: put in a new dash

well here's the theory first

you PCM (powertrain control module) decides when and IF it wants the A/C compressor to run

when the PCM wants the compressor to operate it supplies a GROUND for the A/C relay

Therefore... FIRST lets see if the PCM is commanding the relay

the easiest way to to remove the a/c relay
install a small wire to pin 85 of the relay...it SHOULD be marked on the relay
re-install the relay

they make cool little adapters for this but they cost about $100 off the tool truck

then using a regular test light, install one end to the vehicle battery and the other to that little ground wire

turn your a/c on, engine running obviously, and see if your test light illuminates

if it does not, then we have to repeat this same test but this time at the PCM pin # 1 connector #3

again, if no illumination then we need to find out why the PCM is not commanding the clutch operation

if however, it does not illuminate at the relay BUT lights at the PCM then you have an open in the circuit between the PCM and the a/c relay

good luck and keep me posted!

Sean



Posted on May 21, 2010

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Air conditioning compressor on my 98 Chevy blazer won't engage. The AC is fully charged. The compressor


the compressor isn't getting the pressure for the clutc to maintain after disengaging the short by removing paperclip. check fuse, relay, and the low/ high pressure lines. if the compreeor doesn't since the correct amount of gas charge and/ or receives it the clutch wont engage not sure about a weak compressor if it may be a contributor. will check back later short on time. I just had mine fixed 2001 chevy 4wd. it was the relay and charge.

Jul 25, 2015 | AC Cars & Trucks

1 Answer

Hi I have a power issue to my ac compressor on my 97 chevy 3500 checked the fuses and the relay and both pressure switches seem to b working dont know what else to look for


Not sure I follow you.
Power goes from the ac relay to the low pressure switch, then the high pressure switch, then to the ac clutch. The clutch is grounded nearby.
Are you saying you don't have power at the clutch or any of the switches ? Do you have power on the lite green wire coming out of the relay ?

Jul 08, 2013 | Cars & Trucks

1 Answer

97 chevy suburban won't start I believe it is


does the motor crank when key is turned?If so check for a spark at the plugs.Get an auto electrician bypass your alarm

Mar 22, 2012 | 1997 Chevrolet Suburban

1 Answer

2007 toyota tundra a/c clutch won't engage. Is there a fuse or relay?


Hi Jim, When that happens it usually means that the gas has leaked out and the pressure in the system is too low to operate. There are pressure sensors in the system for just that reason. Have the pressure checked, or if you live somewhere where you can buy the do it yourself kits, purchase one and check the pressure. If not you would do well to go see a refrigeration technician. There are relays and fuses but the most likely cause is the one I've mentioned. Regards John

Nov 09, 2011 | Cars & Trucks

1 Answer

I have a 1998 chevy cavalier, I was driing and the AC was working. I stopped and when I started teh car again a couple hours latter the AC was not working. The fuses are good and the comressor and dryer...


Did you check the AC relay? Usually located under the hood, try swapping it with another relay with the same part number that isn't required to run the vehicle. If the AC now works, then replace the relay. If not , then verify compressor operation. With the engine running, watch the compressor clutch while someone else turns on the AC control. The clutch should engage and begin to run. If not, then find the pressure cycling switch usually located on the accumulator. Disconnect the harness and jumper the contacts. With the engine off and the key turned on , turn the AC control on. You should now be able to watch the clutch engage and disengage by removing and replacing the jumper lead. If it does, then replace the switch. I hope this information is helpful. Thanks for trying Fixya.

Jul 04, 2011 | 1998 Chevrolet Cavalier

1 Answer

AC compressor won't engage clutch


Lots of things can cause this, I will list them, easiest first.

A blown fuse or relay can prevent the clutch from kicking in. Low refridgerant charge will also do this, the low pressure switch will prevent the clutch from engaging when there is low refrigerant to prevent damage. You may need to put more in, and you also may need to jump the low pressure switch to get the compressor going to add more in. Very rarely the controls could have gone bad, which are the buttons on the dash. Id check out the fuses, relays, and pressure in the system first. A shop may even do a free diagnosis for you.

Jun 17, 2011 | 2002 Ford Escort

2 Answers

Ac problem no voltage to ac clutch on dodge caravan 1999 3.3 eng


If you do not have enough refrigerant in the system. The low pressure switch will prevent the compressor from engaging to avoid damage.

Check your pressure.

I don't recommend this, but you may need to jump your low pressure switch to get the compressor going to add more refrigerant to the system. But if your low on charge, it may be "best to take it to a shop to have them fill the system".

Jun 09, 2011 | Dodge Caravan Cars & Trucks

1 Answer

1999 chevy suburban. the ac compressor doesn't engage. could it be a relay or is the compressor bad?


hi.
it is possible for either to be faulty, but it far more likely to need regassing.
there is a pressure switch in the freon system that will prevent the A/C clutch engaging if the pressure is too low.

i would get the refrigerant checked and topped up before starting to worry about anything else.

Apr 17, 2011 | 1999 GMC Suburban

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

373 people viewed this question

Ask a Question

Usually answered in minutes!

Top Cars & Trucks Experts

yadayada
yadayada

Level 3 Expert

76649 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22219 Answers

Randy Ohler

Level 3 Expert

14585 Answers

Are you a Car and Truck Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...