Question about 1998 Chevrolet Blazer

1 Answer

AC clutch only engages intermittently.

The system is charged with refrigerant (and holding), relay switch is good because I've changed it out, Clutch engages and stays engaged when I "jump" power at the fuse block. How do I troubleshoot the problem?

Posted by on

Ad

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Chevrolet Master
  • 22,246 Answers

On the Ac system is a low pressure switch ,sounds like its faulty so fit a pull or flick switch from ignition supply and run this direct to the pump

Posted on Jul 25, 2013

Testimonial: "You got it! I jumped the connection at the switch and the clutch engaged perfectly. I'm assuming that I can leave the connection jumped and just bypass the sensor since I know that the pressure isn't low? It'd be much easier (and cheaper) to plug the gauge up every few days to check the pressure."

  • 1 more comment 
  • Colin Stickland
    Colin Stickland Jul 26, 2013

    ,not a good idea ,gas should be checked by weight not pressure ,when its not so cold you know it wants topping up

  • medicdan623 Jul 26, 2013

    Youve been a big help Mr Stickland. Thanks a million for sharing your expertise.

  • Colin Stickland
    Colin Stickland Jul 26, 2013

    glad this old analogue grease monkey could help,Us brits owe a lot to our american cousins because without you lot because without you lot we would have had a gestapo led common market 70 yrs ago

×

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.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
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
  • 625 Answers

SOURCE: Air conditioning

by pass the cycling switch located on a/c acumulator and turn a/c on if works then you might be low in freon or have a bad cycling switch

Posted on Jun 17, 2008

  • 11 Answers

SOURCE: 1996 chevy s10 will not

check the crankshaft sensor

Posted on Aug 14, 2008

SOURCE: I have a 1992 chevrolet

The pressure switch will open when freon pressure is too low, the compressor clutch is controlled by the computer or module.
The switch isn't necessarily bad, you can check it with a multimeter. The fitting it is threaded onto should have a valve inside and an O ring to seal so no freon loss should happen when removed.

Posted on Aug 23, 2008

alicantecoli
  • 22246 Answers

SOURCE: ac not working

if you by passed the relay and clutch engaged then this shows that pump works ??but was it getting cold on and around the restrictor valve where the pipes enter the cab is normally a valve block but american monsters use a valve in the pipe for cooling and if its not getting cold their or blowing cold inside cab then system needs re-gassing with R 134 gas if its an older system with R 12 gas then it will need to have adaptors fitted to valve connections and refilled with R134 gas.The main cause of A/C system loosing gas is porosity in the rubber flexible pipes also the back seal on the pump.Or just regass and put a leak stopper in the system

Posted on Nov 04, 2008

66 chrgr
  • 1011 Answers

SOURCE: cannot find relay center in 1990 corvette

check the low side switch located on the ac receiver drier for 12 volts if so jump it with a paper clip if the compressor comes on then the relay is good if not the relay is in the fuse junction box under the hood.Most likely the pressure sensor.

Posted on May 23, 2009

Add Your Answer

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

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

Have a 95 grand jeep chrokee limited 5.2 liter pcm will not ingauge AC clutch relay


the AC compressor has a "shutdown switch" when not enough refrigerant is in the system run a wire from the

run a wire from the + battery cable to the compressor pulley switch with the engine running, ac on if the compressor clucth engages (turns) you have low refrigerant charge





=

Feb 05, 2013 | 1995 Jeep Grand Cherokee

1 Answer

1998 dodge ram1500 airconditioner clutch not getting power


You may just be low on refrigerant, if the system is low the compressor will not engage, the oil that lubricates the system is carried by the refrigerant as it is pump around the system, so if it is low the compressor will seize up, so it is shut off by the low pressure sensor switch. To confirm this is the problem have a shop that repairs AC systems run a pressure test on the system with a set of AC pressure gauges. If it is low you have a leak, it must be repaired before it is re charged.

Jul 17, 2012 | Pontiac Grand Am Cars & Trucks

1 Answer

1991 Mercedes Benz AC Cycling Switch /Compressor Clutch Won't Engage Completly Spins 1/6 of a complete spin repetedly then stops


You need to have the refrigerant charge level checked, it sounds like it is low. You Need a set of AC pressure gauges to do this testing. If the system has a low charge the pressures will be very low in the low side testing port.

Jun 26, 2012 | Cars & Trucks

1 Answer

What energizes ac relay on 2005 freestar


The low side pressure switch in the AC low pressure line signals the PCM (computer control) to close the AC compressor relay and raise the idle speed. If the system is low on refrigerant charge the relay will not allow the system to engage the compressor, this is because the oil that lubricates all the works is suspended in the AC refrigerant, if that is low then the system gets no lubrication and will quickly seize up..

Mar 23, 2012 | 2005 Ford Freestar

1 Answer

My a/c compressor is only blowing hot air when I turn it on. I know a little about cars so I know it's the a/c but I am not able to find one on any site that may sell used or new.


If all you get is hot air there are several possibilities. The compressor is driven by the serpentine belt and is engaged and disengaged by an electric clutch mounted on the compressor drive pulley. With the engine running, have an assistant turn on the AC while you observe the AC compressor clutch. If the clutch engages, you can be reasonably sure that the system has freon, and the electric circuit is OK. If the clutch doesn't engage, which is the most likely situation, either you are low on freon, the AC clutch relay is inop, or AC compressor fuse is open (blown). A search of Google images will give you the location of the AC relay. You can pull out the relay, carefully remove the cover, reinsert the relay, and engage the compressor clutch by manually closing the relay contacts. Warning: do this only for a second or two in order to see the clutch engage. If the clutch does engage, then you are probably low on freon. There is a safety switch that prevents the clutch from operating if there is not enough freon in the system. Hopefully, this is the case. Go to Walmart and get two cans of r-134 and the inexpensive kit, and following their instructions, charge your system. If this is not the problem, you'll need a set of AC gauges and the skill to use them. Hope this helps. Dano

Aug 31, 2011 | 1998 Lexus Gs 400

1 Answer

I have a 2007 chevy sliverado 1500. the ac is not working i have changed the fuse and the freon is good what else could be the problem?


This won't be a complete solution, but here's a place to start. Have the engine running, truck in park. Open the hood and stand to the side of the truck. Have someone help by sitting in the truck turning the AC on and off over and over. Your AC pump runs off your engine belt and has a clutch on it so that when you aren't using the AC, the pump doesn't turn. You should hear the AC Clutch engaging and disengaging as your helper cycles the system on and off. If you don't hear this, it's probably an electrical problem and the clutch isn't hearing the signal to engage. If you hear the clutch clicking on and off (usually a pretty discernible click) and if indeed the system is charged well with refrigerant, then I would suspect the clutch may be worn to the point that it won't engage. Either of these is a fairly expensive fix, and should probably be done by a mechanic. My truck has to be drained of refrigerant before the clutch can be changed, and if this is the case for you then that refrigerant should be captured and recycled rather than let go into the atmosphere. Also, if work needs to go this deep, filters should be cleaned and lubrication replaced as well... a mechanic will do a great job here. If it's electrical then the solution shouldn't be as involved, but nobody likes electrical work so the price is usually high anyway. :) Good luck!

Aug 29, 2011 | 2007 Chevrolet Silverado 1500HD

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

A/C Clutch not engaging on my Tuarus 1998


YOU CHECKED ALLOT BUT YOU DID NOT MENTION THE AC COMPRESSOR CYCLING SWITCH, DID YOU TEST IT? DOES THE COMPRESSOR RUN IF YOU JUMP IT, HAVE U CHECKED TO SEE IF THE COMPRESSOR TERMINAL HAS 12 VOLTS AND GROUND WHEN TURNED ON? THE CYCLING SWITCH AND THE COMPRESSOR CLUTCH ARE ALMOST ALWAYS THE PROBLEM WHEN THE SYSTEM IS CHARGED BUT THE COMPRESSOR DOES NOT RUN.

Sep 11, 2008 | 1996 Ford Taurus

2 Answers

Air conditioning


here is a link to your problem and a solution:
http://en.allexperts.com/q/4-Wheel-Drive-2700/2008/5/C-Clutch-engaging.htm

Jun 15, 2008 | 1999 Dodge Intrepid

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

223 people viewed this question

Ask a Question

Usually answered in minutes!

Top Chevrolet Experts

yadayada
yadayada

Level 3 Expert

76846 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22246 Answers

Ronny Bennett Sr.
Ronny Bennett Sr.

Level 3 Expert

6924 Answers

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

Answer questions

Manuals & User Guides

Loading...