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Converting a S10 back to R12

bob234 on Mon August 23, 2010 1:39 AM User is offline

Year: 1993
Make: Chevrolet
Model: S10
Engine Size: 4.3
Refrigerant Type: R12

This truck was converted back to R12 by the previous owner. He said the high side schrader valve was leaking, so he just removed it, and stuck a R134A retrofit adapter with its own valve over the high side port. Then he recharged the R12 using the low side port on the accumulator. I want to change the compressor on this one as it sounds very bad, but how is a shop supposed to evacuate the R12? Also, anyone know where I can get just a high side schrader. I am keeping this truck R12. R134A doesn't work well with old style S10s. Head pressures skyrocket and compressors make grinding and rattling noises in 95+ heat. With R12 the same exact compressors will run quiet, and blow ice cold.

Edited: Mon August 23, 2010 at 1:55 AM by bob234

webbch on Mon August 23, 2010 10:30 AM User is offlineView users profile

There are plenty of adapters that a shop will have to deal with this. If it were my equipment, I'd be sure to ID the refrigerant, rather than go on the PO's word.

After that, a complete flush of the evaporator, condenser, and all the lines (with exception of any line that has a muffer) is in order since the compressor probably grenaded it's internals throughout the system. Along with the new compressor, you'll also need new accumulator, replace any lines with a muffler, o-rings, mineral oil, and then finally the R12. The R12 is pretty spendy - the last time I checked was about 3 years ago, and the shop rate was like $60/lb, so I bought a tank of it and paid about $15/lb, but a larger initial investment.

I have to say it's strange that he recharged with R12 (the correct refrigerant for that vehicle, but very $$$ these days), but did a pathetic hack job on resolving the schrader valve. It's far more likely that he put a blend in the system.

Edited: Mon August 23, 2010 at 10:31 AM by webbch

Dave in Texas on Mon August 23, 2010 12:07 PM User is offlineView users profile

I converted my '87 Cad back in '96-'97. A few years ago, I too had a leak from the High-side OEM schrader valve(darn hard to find too with the adapter over the port)....rubber-seat deterioration was the cause. I replaced it with a plastic-seat type valve, instead of the rubber-seat type. Hasn't leaked in the past 2yrs.

At 2, I went home with a 10. At 10 I woke up with a 2 !!

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