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Need 1992 4.3l S-10 Conversion help

Torino on Thu April 01, 2010 4:44 AM User is offlineView users profile

Year: 1992
Make: Chevy
Model: S-10
Engine Size: 4.3
Refrigerant Type: r-12
Country of Origin: United States

The compressor on my '92 s-10 has a leak and it looks like I need a new one. Since I need a compressor I thought I would convert to 134. Could someone give me the parts and directions to do a good job? Should I get a compressor from another year s-10 that runs 134?

Edited: Thu April 01, 2010 at 4:45 AM by Torino

Chick on Thu April 01, 2010 4:49 PM User is offlineView users profile

here is a link to the 92 S-10 blazer replacement parts, the compressors shown will be R134a ready.. Chnage the accumulator, O tube, flush the system and use BVA auto 100 ester oil or Pag 150.. check the FAQ page for vacuum charge instructions.. hope this helps..

Email: Chick


Freedoms just another word for nothing left to lose

Torino on Thu April 01, 2010 8:37 PM User is offlineView users profile

Thanks Chick

Torino on Fri April 02, 2010 2:42 AM User is offlineView users profile

Do I have to change any O-rings. What about those kits you can get that have the oil added to the coolant?

Edited: Fri April 02, 2010 at 5:45 AM by Torino

NickD on Fri April 02, 2010 6:58 AM User is offline

When you refer to refrigerant as coolant, think more about anti-freeze that is getting impossible to find without a premix, 50-50, no good in my Wisconsin climate. In like manner getting difficult to find a can of R-134a that doesn't have a bunch of crap added to it.

In the good old days, was considered a sin to pump oil with refrigerant, oil doesn't cool, refrigerant does, so a separate oil sump was used in compressors. Now the oil is mixed with the refrigerant because its cheaper, like a two cycle engine. Chick gave you the recommendations, important to flush out your old system and get it clean again, and use the type of oil he specified and the correct quantity. Too much and you will lose cooling, too little and your compressor will seize, and you certainly don't want to mix oils in your system, can make sludge in the process. Believe the correct amount of oil in your system is 8 fluid ounces, Tim has the charts and that's exactly what you want to put in. And try to find a can with only R-134a in it, actually easier to buy a 30# cylinder as you don't have to switch cans when charging. Always the possibility of adding air, that doesn't cool very well either.

Torino on Fri April 02, 2010 11:40 PM User is offlineView users profile

Mechanic said all r12 has leaked out. Do I install the new compressor then flush system or do that before I install compressor. Would it be best for me to install the parts then take it to an ac place and let them fill the system?

HECAT on Sat April 03, 2010 7:28 AM User is offline

You remove the parts being replaced, and then flush. You cannot flush through compressors, filters, or the orifices. Once you have confirmed all components to be reused are completely clean and dry (no oil or solvents remaining), you can begin to add fresh oil and new parts.

Do not use one of the "kits". They are refrigerant cans that include oil (how much) and sealant (clogging, contaminating junk); with instructions to charge it all in on top of the remaining mineral oil. These are also known as "death kits".

You can order this A/C Repair Manual and read the Flushing Tech Paper in my signature below.

It not quite as easy as changing an alternator or a water pump, but we can help. It usually does require some deeper A/C operational understanding and some minimal tooling. You will have to make the call yourself as to whether you are going to tackle it, or take it to a shop.


HECAT: You support the Forum when you consider for your a/c parts.


k5guy on Tue April 06, 2010 6:49 PM User is offline

Speaking from experience on a K5 Blazer (very similar to S10), on a R12 to R134a refit, I'd replace the condenser while you can. I did my first refit without changing the condenser, and the performance was lousy. Changing the condenser to one made for R134a made all the difference.


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