New AC Questions (Not the same old ones)
 

After pouring over the internet, mostly here, but also some other sites, I want to know if I can swap in the compressor from a 90-95 4Runner. I have an 87 4Runner 4x4 5Speed 22re. If i get a compressor from a newer 22re 4Runner that can handle the added pressure of R134a, change out all the seals, get a new dryer, change the ports, remove all the old oil, and make sure I dont have any leaks I should be able to add the proper oil and fill it with R134a. Right?
I downloaded the FSM for the 2nd gen 4Runner and cant tell if it is exactly the same. I also google image searched, but I couldnt find any definitive proof that this would work. Its hot out here in Hawaii!

Here is what I was told and here is what I learned about r134. My system is an r12 system. After trying to drain out much of the r12 out...nothing did come out. I then installed r134 into my system. Now Ive heard a mixture of things from different people...that you can add r134 to an r12 system..or you cant. Theyll tell me who there certified by but i could careless....

What has been the common point from what I have been told is it depends on your condensor. That being said Im sure you know that there are 3 different oils or I guess maybe mixtures you can add to your compressor.

1. Pag 150 oil designed just for r134 only
2. Mineral oil designed just for r12 only
3. Ester oil designed just for mixture of the two.

These questions are not that hard to answer. Go to a dealer site like http://www.toyotapartsoverstock.com/...erm=compressor Look up the compressor for an '87. Okay, it's a little complicated, because it matters whether it's for a Canadian, California or 49-state truck. But select any one of them, and half-way down the page look at "Product Fitment." In EACH case, the '87 compressor fits no vehicles newer than '88.

Why? I don't know. A compressor is a compressor, so you could probably take one out of a beer cooler and make it work eventually. It might be as simple as the mounting holes. But for plug and play, a compressor from a '90-95 won't fit an '88.

As to Yota.Jay's comments re mixing. First, you can't "drain" R12 out of anything. It's a gas at room temperature and pressure. If you just open up one of tubes, it will spew out into the atmosphere, destroying the ozone layer, killing us all, and setting you up for a $10,000 fine.

The issue is the oil; mineral oil in the old R12 system, polyalkylene glycol (PAG 46, not PAG 150) for R134a. This won't just drain out (both are "oily"); you need to blow it out with A/C System Flush pushed through under pressure.

What if you can't get it all out, will it ruin your A/C? Well, you can listen to "certified" people, or you can listen to anonymous people on the internet willing to tell you "what they learned" (without any references). Or, you can listen to Toyota. TSB AC002-98 http://tms.cleanautoalliance.org/documents/ac002t98.pdf Toyota says you can just leave the mineral oil in with the new PAG 46, and it will work, but your sight glass won't be usable anymore.

Last, you don't need a compressor that will handle the "higher" pressure; it's not that much higher. (And Toyota continued to use R12 right up to January 1, 1994, so getting a compressor from a '90-'94 doesn't matter.)

Well your not dead, I don't have a fine...the people on the internet have spoken. As always with anything I'll go get a second opinion. Sight glass dont have a clue what that is? Im just told mixing the two...there isn't a def. yes or no. It's subjective-depending on who you talk to it will change. Im just filtering the information I get and getting cons, pros, and equals through it all.