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Old 04-06-2013, 09:04 PM   #1
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Ac compressor replacement problems

I have been attempting to replace the compressor in my 91 gta for the past 3 days with no luck on getting it to work right. The first replacement from rock auto was an ac Delco remaned installed it pulled a vaccum on the system it held fine but as soon as I charged it the connection where the lines attach to the compressor started leaking I attempted multiple diffrent combinations of the seals that came with the compressor still no luck. I have also tried a diffrent compressor from oreillys installed and seemed like a better fit held vaccum also charged and as soon as I charged it, it blew again I've ordered the lines now too just wondering if anyone else has these kind of issues before
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Old 04-06-2013, 10:19 PM   #2
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Re: Ac compressor replacement problems

I haven't ran across this in the many hundreds of systems I've worked on but I'd check the length of the bolt holding the line in place, It could have been replaced at some point and is too long for the replacement compressors your installing (bottoming out).

Sorry to ask, But since your pulling a vacuum you are using a set of gauges right ? How many inches of vacuum are you pulling and for how long, And how long are you letting the system sit under vacuum before re-charging ?

What was your suction and high side pressure when it blew ?
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Old 04-06-2013, 10:49 PM   #3
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Re: Ac compressor replacement problems

i actually have access to a professional machine i pulled it down to 30" hg for 30 mins followed by a 10 min leak test holding vacuum the hole time but as soon as i switch the machine to charge it starts leaking before the low side reaches 30psi and thats as far as i let it go before i flip it back to recovery to try to save what 134 has been put in
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Old 04-06-2013, 11:10 PM   #4
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Re: Ac compressor replacement problems

doing more research i think the previous owner installed an 89 and earlier a/c setup on the car because i had to change the connector for the compressor clutch. those of you out there that have worked on both styles are the lines connection at the compressor different between them ?
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Old 04-07-2013, 10:15 AM   #5
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Re: Ac compressor replacement problems

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Originally Posted by 92firebirdLT1 View Post
doing more research i think the previous owner installed an 89 and earlier a/c setup on the car because i had to change the connector for the compressor clutch.
While I haven't worked on both systems side by side, A quick look-up of the hose assembly shows 88-91 being the same part number and 87 back different, But it doesn't state what the difference is between the two.

Same applies to the evaporator, 88-91 and 86 back different. All accumulators 83-91 are the same. Not knowing exactly what has been changed in this system, If both your evap lines exit the same side of the evap the evap and enclosure is still original to the car. If this is the case, I'd suggest a new 88-91 hose assembly as you mentioned with the compressor for your 91 application......
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Old 04-07-2013, 04:28 PM   #6
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Re: Ac compressor replacement problems

i ordered the new hose for the 91 waiting for it to show up to compare to the original it is just very frustrating that it wont be here till Tuesday I miss having an advance auto parts in town they got shipments in every day
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Old 04-07-2013, 05:55 PM   #7
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Re: Ac compressor replacement problems

You frustration is understandable, I hate leaving a system sit at atmospheric pressure while waiting on parts. Don't forget to check the hose mount bolt.....
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Old 04-07-2013, 08:49 PM   #8
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Re: Ac compressor replacement problems

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Originally Posted by Restrorob View Post
A quick look-up of the hose assembly shows 88-91 being the same part number and 87 back different, But it doesn't state what the difference is between the two.
Non-serpentine (v8) cars had the compressor on the drivers side.
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Old 04-09-2013, 12:50 AM   #9
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Re: Ac compressor replacement problems

Well, I THINK I know the problem you are referring to. If it is the same, then I had the same issue. The lines end at a "block" of sorts that gets bolted to the back of the compressor and it's leaking from between the block and the compressor, right? If so, and I do not know the why part, but the rubber/metal washer/gaskets/whatever aren't thick enough. I couldn't figure out why, but I figured out how to solve the issue. I just used 4 rubber/metal washers instead of two between the ac hose block and the back of the compressor. I doubled up on each basically. Is it correct? I highly doubt it. It does work though, for years. They are metal washers with a rubber coating on the ID of the washer, so they are most definately not going anywhere, ever.
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Old 06-26-2014, 11:59 AM   #10
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Re: Ac compressor replacement problems

that is a good tip, I have the same leaking issue at the same spot
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Old 06-26-2014, 05:38 PM   #11
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Re: Ac compressor replacement problems

Well it's been delayed indefinitely the shop I was working in was broken into and my car vandalized got most of the damage repaired between insurance and savings but lost my job as a teacher which lost me the shop haven't had time or money since then to work on it
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Old 06-26-2014, 05:46 PM   #12
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Re: Ac compressor replacement problems

heres a pic of what it looked like
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Ac compressor replacement problems-photo.jpg  
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Old 06-26-2014, 09:23 PM   #13
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Re: Ac compressor replacement problems

Very sorry to hear that....thieves suck!
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Old 07-15-2014, 01:56 AM   #14
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Re: Ac compressor replacement problems

Ditto what Dave said.
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Old 07-15-2014, 10:08 AM   #15
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Re: Ac compressor replacement problems

Yeah, ouch.
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