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1990 Toyota coverted R134 Compressor

MikeAlpine on Fri July 27, 2012 7:34 PM User is offline

Year: 1990
Make: Toyota
Model: Pickup
Engine Size: V6 3.0
Refrigerant Type: R134
Country of Origin: United States

Thanks to all who chose to read this post.

I have a 1990 Toyota Pickup (great vehicle) with a system that will not hold a charge. Dye is telling my mechanic that it is leaking at the compressor. I did not buy this new and a prior owner converted it to R134. My mechanic, best I ever had, tells me it looks factory, that it must have been done at the dealer. It has the R134 hoses and is a NipponDenso.

The issue is that when I try to source a replacement, it's always a R12 compressor for the original 1990 Toyota pickup. My mechanic tells me that it is very difficult to read the numbers on the compressor, but it looks like DE21GN A901. Those numbers are apparently are not exactly correct.

I guess an R12 compressor will work, but it would be nice to do it right. I am not necessarily interested in absolute lowest dollar solution, but I don't mind playing the odds that a decent unit will not fail and force me to pay double labor.

I appreciate any input, as I am pretty much in the dark. I just want to find a good replacement.

Thanks again to all and especially those who are kind enough to share their knowledge.

Cussboy on Fri July 27, 2012 9:34 PM User is offline

All modern compressors can handle either refrigerant and either type of refrigeration oil.

If that new compressor comes filled with oil, make sure that it's the right type of oil (I tested mine for my 1988 Mazda truck - I stayed R-12 - compressor came with ester oil for R134a). Most likely best to drain out the oil in the new compressor, flush with several ounces of correct oil, turning compressor over several times, then draining, then repeat flush/drain, then fill with correct amount. That's what I did with my compressor.

JJM on Sat July 28, 2012 4:40 PM User is offline

Where exactly is the compressor leaking from? Most compressor leaks are from the shaft seal, and shaft seals and typically be replaced (with the proper tools - many of which are available from the site sponsor).

And Cuss is correct... R-12 or R-134a for the compressor doesn't make difference... just make sure you're using the right oil. One thing you do want to make sure is that when you replace the dryer, however, that it has XH-7 or XH-9 desiccant compatible with R-12 or R-134a. XH-5 used in R-12 systems will fail with R-134a, which is a disaster.


When considering your next auto A/C purchase, please consider the site that supports you:

MikeAlpine on Sun July 29, 2012 4:18 PM User is offline

Thanks Cuss and Joe,

It goes to show how little I know about this. It certainly simplifies things. My mechanic is out this week, but I certainly will find out were that puppy is leaking. She blows really cold right now, so that's a good thing. Actually, I have not driven it in a few days, but I am heading to the car wash right now.

Thanks again. I will report back when I know more.


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