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96 CHEVY HARRISON STEP MANIFOLD HOSE

BROWNBAGG on Wed June 25, 2008 8:04 AM User is offline

Year: 96
Make: CHEVY
Model: PU
Engine Size: 4.3
Refrigerant Type: 134
Country of Origin: United States

Had a compressor clutch lock up and take out the serp belt, owner installed an older r12 ccompressor so it could be driven. It has a 134 factory system. the hose manfold will not bolt up. the port seem to be stepped.

Is there a way around this, has in adapter? the compressor are the same brand. style.

GM Tech on Wed June 25, 2008 8:52 AM User is offline

Your truck got a year younger since you posted from the other forum.....There is a big differnce between a '95 and a '96-- the compressor is an HT-6 on the '96- with completely different mountings.....yours I believe is an R-4- found on all pre-'96 models

There is no adapter to reverse what you want to do- the only possible solution if you insist on keeping this Non-step block compressor on this step-block system- is to buy the sealing washer adapter kit that is designed to do just the opposite of your current set-up- and that is to put a step block compressor on a pre-1994 vehicle- as in a service compressor for an R-12 system- that comes with the kit I speak of-- which is A/C Delco part number 15-20058 (seal washer kit). You can try to stack up whichever sealing washer in that kit that makes the block "level" and see if it works-- but I have never done this-- does the clutch coil connector match? is there a high pressure cut-out switch in the rear of the compressor to plug in for the '95 now '96 truck system? Some of those R-12 R-4 compressors had NO switches in the rear of compressor-- and your '95 needs one-- so is there a port to put it in-- or is there a switch already in it? There is also a chance- depending on the year R-12 "Donor" pumpo you have on- that the switch in back is a "recirc" switch and probably not a high pressure cut-out switch-- if the switch is a 2 terminal it is what you want-- if it is a single terminal- then you need to trabsfer the HPCO switch from the OEM pump.

It would be silly to design the compressor to avoid what you are trying to do in the public sales domain- then to come back with adapters available and say it is okay now to do it......there are other things like compatible o-rings and internal parts that were not designed for 134a - so that is why the step-block.....

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The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

BROWNBAGG on Wed June 25, 2008 2:28 PM User is offline

its a late 94 so that would be a 95, it has a true factory 134 system. This was brought to me because the other mechanic and owner has issues. I really dont want to mess with it. Deep down I,m thinking its needs a 134 compressor, but the other mechanic put a used compressor on it, so it can be driven. The owner wont understand this. So I was just checking to make sure I had all my fact and wasnt leaving anything out before I tell him, new compressor, it wont work.

manly just checking to see if someone agrees with me that I cant make it work and get another compressor. the only other way I can think is replace the hose ends.

I really dont want to mess with this truck

GM Tech on Wed June 25, 2008 2:41 PM User is offline

Replacing the hose end won't work unles you have them made up-- the R-12 hose assemblies have english threads on the other ends- condenser and A/D-- so unless you go and cut off a pre-94 donor hose and take it to a hose maker to crimp it on your current hose nat the compressor end manifold - would be the only way--- Too many issues to try to use that POS pump that some ACE mechanic put on there-- Why did he not get a "used" 134a pump? He must have sold him something he had laying around- just to be able to drive it-- with absolutely no intention of ever using it for A/C activation again....

A "dummy" bypass pulley would have served the same purpose

-------------------------
The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

Edited: Wed June 25, 2008 at 2:42 PM by GM Tech

mk378 on Wed June 25, 2008 3:21 PM User is offline

Don't mess with a used R4. If you're going to work on this truck, insist on replacing it with a good one that is the proper fit. You have no idea of the internal condition of that compressor, and like GM Tech said, the other guy probably had it laying around-- for a reason.

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