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what is involved changing 85 Toyota truck to 134a

Arcseeker on Fri June 17, 2011 10:13 PM User is offline

Year: 1985
Make: Toyota
Model: pickup
Engine Size: 2.4L
Refrigerant Type: R12
Country of Origin: United States

I am admittedly ignorant of many things A/C, that said, I want to change to 134a in this vehicle. I have a fresh rebuilt compressor (rebuilt by Denso) Denso P1013C that has not been installed yet, I have ordered a new evaporator core and also have a new (stock ) Denso TXV valve, does this need to be different ?. I am still looking for a parallel flow condensor that will work. The compressor says it has Denso oil 6 in it. i have seen in my recent searches for info that i need to change the service valves too. Do I have to get a different dryer than the stock one?

any help will be greatly appreciated, this car is getting a fresh rebuild on the motor and transmission, would be great if I can modernize the A/C system too, besides I am in Kalifornia and R12 is insanely expensive now.

Bob

Edited: Fri June 17, 2011 at 10:35 PM by Arcseeker

TRB on Fri June 17, 2011 11:04 PM User is offlineView users profile

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NickD on Sat June 18, 2011 6:58 AM User is offline

Everything is insanely expensive now like having to replace a fuel pump for 450 bucks when you could buy a complete rebuilding kit for a buck and do the job in five minutes instead of a day.

If not too badly mistaken, Tim will correct me, your system only holds around 24 ounces of R-12, with R-134a conversions that I have never tried, problems are encountered with attempting to obtaining a clear sight glass at 2,000 rpm, doors, open, AC on, blower at max on a 80*F + day. Also have to find an R-134a calibrated TXV besides that parallel flow.

Call me lazy, but a lot depends on the condition of your system, just stuck with R-12

Arcseeker on Sat June 18, 2011 10:16 AM User is offline

Quote
Originally posted by: NickD
Everything is insanely expensive now like having to replace a fuel pump for 450 bucks when you could buy a complete rebuilding kit for a buck and do the job in five minutes instead of a day.



If not too badly mistaken, Tim will correct me, your system only holds around 24 ounces of R-12, with R-134a conversions that I have never tried, problems are encountered with attempting to obtaining a clear sight glass at 2,000 rpm, doors, open, AC on, blower at max on a 80*F + day. Also have to find an R-134a calibrated TXV besides that parallel flow.



Call me lazy, but a lot depends on the condition of your system, just stuck with R-12

I wouldn't call you lazy at all since I didn't address the practicality of doing this swap in the first place. All said and done the system as originally built performed flawlessly for a very long time. Seems to me that as I already have the components I would probably end up with more total expense changing it than remaining with R12. I should really be asking how I can optimize this system for reliability and longevity. I want to do this right.

Are the green O-rings the best I can get for this as an r12 system? I see the red Nylog for sale too, is it used as o-ring dressing also?

Regarding the rebuilt compressor, I empty the oil out, measure it and replace the recommended amount for the system? I want to assemble this entire system as far as possible before taking it in to be recharged in condition clean and empty except for the oil.

Does it make any sense or will I see any benefit using the condenser for a 4runner? It is bigger with more tube and fin area , it will fit, and the inlet and outlet fittings are the same. I also have a set of hard lines and hoses to hook it up that came from a 4runner. In case you are unfamiliar with the vehicle the 4runner has a passenger area volume comparable to a jeep cherokee or the like, my pickup is the XtraCab model.

Is brake cleaner all right for cleaning out the hard lines and hoses? i would just use it for these items, not the condenser,evaporator or dryer. The lines came from a system that was working, no evidence of compressor failure.

If I don't crack open a can of refrigerant does it pretty much have an unlimited shelf life?





Edited: Sat June 18, 2011 at 11:37 AM by Arcseeker

chris142 on Sat June 18, 2011 1:49 PM User is offline

We retrofitted a friends 86, 4runner to R134a. This truck had the larger condensor in it already. It's got a 2nd smaller condensor mounted in front of the larger one. Flushed the system with AC solvent, New dryer, Ester oil ( I forgot how much but I'd guess 6 or so oz)and 1.40lbs of R134a.

He says it works great! He drives across the desert on I-40 from SoCal to Arizona every month and he says that he has to turn it down going across the desert as it gets too cold.

NickD on Sat June 18, 2011 8:53 PM User is offline

Never thought about adding a second condenser, sounds like a good idea, have to give that some thought for my 88 Supra Turbo if converting.

It already has an intercooler, AT and engine oil cooler, and two auxilary electric booster fans in front of the condenser, but they say, there is always room for one more.

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