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Checking the compressor for Drag

Ryano on Thu December 06, 2007 4:45 PM User is offline

Year: 95
Make: Olds
Model: Cutlass
Engine Size: 3.1
Refrigerant Type: 134a

Its been brought up in a different forum that the cause of GM 3.1 engines may be heating up because of compressor drag. My question is what would one have to do to check this?
I fI take the belt off wont the pully just spin?
Denny

Chick on Thu December 06, 2007 4:51 PM User is offlineView users profile

I'm not really sure what you mean by the "engine" heating up? Do you mean when the AC is being used? Or in general? The 3.1 engine uses the V5 compressor and it takes very little power from the motor to run it, even a bad compressor shouldn't make the engine overheat. The cooling fan that operates with the AC is another matter. If it's not operating properly, the motor can run hot, and if the fan(s) don't work properly you will find overheating in traffic without the AC on a problem.. Not much goes wrong with the V5, two problems most common are shaft seal leaks, and refrigerant control valves..

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

NickD on Thu December 06, 2007 5:19 PM User is offline

Any compressor can seize due to a lack of lubrication or even the idler pulley bearing going south. In which case, you may hear an annoying squeal as the belt slips before it breaks. Regarding the engine overheating due to compressor drag, you may want to submit that to Mythbusters as they are looking for myths to bust.

Ryano on Thu December 06, 2007 5:55 PM User is offline

This would be a good one for Mythbusters.

I found a post where a guy operated his car with high temps couldent figure out why it was happining, no mention of any bearing squeel, he figured it out when the compressor locked up and broke the belt.
http://www.chevytalk.org/fusionbb/showtopic.php?tid/169370/

I also have the high heat problem and would like to know how to check my compressor. what the best way to go about doing this.

I also read a post here about oriface blockage that may play a part in tempory lockup until a certain preasure is reached. Im not certain what the effects are of this condition.
Thanks for the input.

Chick on Thu December 06, 2007 6:15 PM User is offlineView users profile

I didn't read the whole thread, but you will notice he said the fan wouldn't come on at all...That would do it.... The extra heat from the condenser would add to an already poorly operating system... Glad he figured it out..

You can't compare your car to another, so it would be best to post your problem, what you did to resolve it, and make sure your colling fan(s) are working. Pressures would also be a big help along with the ambient temp taken at...Hope this helps..

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

Edited: Thu December 06, 2007 at 7:56 PM by Chick

NickD on Thu December 06, 2007 8:10 PM User is offline

Also, something about a class action suit going against GM for Dex cool antifreeze with various engine heating problems, suppose to be settle in a couple of months with GM picking up the repair bill. Here is the link Class Action.

Edited: Thu December 06, 2007 at 8:17 PM by NickD

Ryano on Fri December 07, 2007 2:42 PM User is offline

Ok there seems there may be a problem with the ECM controling the fans. New Question:

I order to control the fans and cool the engine guys have been turning the AC on, the ECM then use's that circut instead of the faulty one witch makes the fans come on late.
Question: Can the compressor be disabled while this while this backyard fix is in oeration?

Edited: Fri December 07, 2007 at 2:51 PM by Ryano

Chick on Fri December 07, 2007 3:01 PM User is offlineView users profile

By "unplugging the compressor" should do it, but I'd fix the cooling problem first, could be as simple as a relay, temp sending unit or ECM amoung many other things.. The cooling system is important, or you risk blown headgaskets for one thing... TRhat may or may not be the cause to begin with...

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

Ryano on Fri December 07, 2007 3:47 PM User is offline

Quote
Originally posted by: Chick
By "unplugging the compressor" should do it, but I'd fix the cooling problem first, could be as simple as a relay, temp sending unit or ECM amoung many other things.. The cooling system is important, or you risk blown headgaskets for one thing... TRhat may or may not be the cause to begin with...

I agree ! Its hard to explain how wide spred these heating ploblems or, its in every fourm and GM related, guys have spent hundreds of dollars with no cure. They have replaced all the expected parts, t-stats,waterpumps,belts,radiators, both sensors, head and intake gaskets, scanned with Tech1 scanners, you name it! I want to test everything before I do any of this. This is on the wifes car it has about 50K miles on it, she only drive 1 1/2 miles to work, the only time the engine see's operating temp is the winter when warms it up before she leaves. Now is the time to go after this before summer gets here.

Ill try out discottecting the compressor and see when the fans come on and off. thanks for the tip.

NickD on Fri December 07, 2007 9:05 PM User is offline

If it's cold, the compressor may never be commanded to come on and without that command, may also not have the command to switch on the fan. Would be nice to see the fan circuit.

Ryano on Sat December 08, 2007 10:27 AM User is offline

Quote
Originally posted by: NickD
If it's cold, the compressor may never be commanded to come on and without that command, may also not have the command to switch on the fan. Would be nice to see the fan circuit.

I cant seem to get the picture to go in. I guess the test for this will be just to try it with the AC fan turned on, if it works it works!


[url=http://img139.imageshack.us/my.php?image=fancircutadx3ue1.jpg][img=http://img139.imageshack.us/img139/5247/fancircutadx3ue1.th.jpg][/url]

Edited: Sat December 08, 2007 at 10:50 AM by Ryano

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