AC repair/overview on a 30 year old truck

[Caman96]

346002 - 1991-93 GM Truck Sanden AC Compressor Upgrade - Small Block V8

Replace your power-robbing R4 compressor with a Sanden-style compressor upgrade that requires less power to operate, runs smoother, and weighs half as much as the original units.

www.classicindustries.com

They are nice, but that says for “truck”. Site specifically says for 1996 and up.
92 Blazer compressor different style.

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[1998_K1500_Sub]

I just looked on Sanden site and I don’t think they make a compressor for a 92 Blazer. I think it said for 96 and up.

Replacing an R4 with a Sanden requires different brackets and hoses.

Google "R4 Sanden retrofit".

ALSO, first and foremost IMHO...

Pull the orifice tube out and see if the filter is clean, or plugged with crap. If crap, I suggest you replace all rubber lines, replace-or-thoroughly-flush all hard lines, and do a d@mn good job of flushing the evaporator (or replacing it, which would be preferable but is not simple).

When you re-assemble, put half of the total oil charge (which I think it's 8oz total for your system, and you'll need to use PAG oil) in the receiver/drier and the remaining in the compressor.

 

[1998_K1500_Sub]

You might want to peruse this thread. It applies to a 1996 truck (which from GM used R134a with an HT6 compressor) but there are other relevant details for you to sift through.

1996 C1500 Reg Cab AC not working - what all do I need?

Hi, I have a 1996 C1500 4.3 reg cab 8ft bed and the A/C is not working, just blows ambient air. Is there anything simple I might be able to check to see if the system is salvagable? I was thinking if the system is bad, to maybe buy a kit or the individual parts needed to replace and flush...

www.gmt400.com

You also might give the guy at AC Kits a call / email and talk to him. He's been helpful to me in the past.

Arizona Mobile Air (ACKits.com)

Auto AC Parts Supplier. Automotive, A/C, Parts, Accessories, Evaporators, Expansion Valves, Accumulators, Filter Dryers, Fittings, Components for rebuilding compressors, Fans, Blower assemblies, DC motors, and reels of hose.

www.ackits.com

 

[1998_K1500_Sub]

Here's some information on the R4-Sanden retrofit, for you or others.

This conversion is a work-in-progress for my 1995 S10 using a Sanden 4864 compressor (see FLX Series Compressor Catalogue, attached).

 

[351FUN]

Definitely not looking to do any retrofits/upgrades, the stock compressor is all I need. I'll also find the orifice tube and check it, if its the filter for the system that's really good to look at. The evaporator core is cheap but it looks like I have to pull the dash to do that? Probably not terrible in these trucks. I think I have a blend door issue too since the passenger vent gets a ton of flow and the driver side gets none.

 

[351FUN]

351FUN I tried looking on RockAuto but I don’t have all your Blazer info, like with or without rear AC. Also, just looking around I couldn’t find any GM Genuine compressor’s other than remanufactured which I personally wouldn’t get.

Blazers don't have rear air, that's only on 4 doors. I've found GM compressors on other sites, not sure if I'd trust the Amazon listing though.

 

[Erin]

This what I ended up going with. No trouble with it.

BuyAutoParts 60-82415CK - Buy Auto Parts

BuyAutoParts 60-82415CK parts are in-stock with free shipping over $. Get a great deal on a A/C Compressor and Components Kit here.

www.buyautoparts.com

 

[Dariusz Salomon]

Blazers don't have rear air, that's only on 4 doors. I've found GM compressors on other sites, not sure if I'd trust the Amazon listing though.

I think that's where I found my Sanden and either purchased from amazon or confirmed that it is a part I need and bought from rockauto. Amazon is ok

 

[Caman96]

Blazers don't have rear air, that's only on 4 doors. I've found GM compressors on other sites, not sure if I'd trust the Amazon listing though.

I didn’t say 4 doors. When I enter information for a 1992 Blazer on RockAuto and look at A.C. Hoses, it shows hoses for With or Without Rear Air.

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[PlayingWithTBI]

Keep in mind, when converting from R12 to R134A you need to completely flush the system. The Mineral oil used in R12 is not compatible with PAG oil used in the R134A system. You can use an Ester oil but, I prefer to flush the system - it needs to be flushed anyway.