3.0 A/C Help

livelarg · 05-29-2004, 06:19 AM

I have a question relating to the A/C compressors. I found a compressor for my truck that used the r134 coolant and not the old r12. I wouldn't mind converting over to the new coolant, but what else is needed beside the compressor to do the swap? and cooling wise, which is better?

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My99 · 05-29-2004, 07:29 AM

You don't need a new compressor, you just need new fittings, new R134, and new R134 compatible oil in your old compressor.

miket223 · 05-29-2004, 07:55 AM

I would replace the drier and any o-rings that get exposed from disconnecting refrigerant lines. The drier is only $25-30 from the dealer and they'll have the o-rings in stock. Everything else you should be able to get from an auto supply store. R-134a is roughly 5-15% less effective than R-12 at cooling. Based upon price and availability to the regular consumer, I would go with R-134a. The loss in cooling performance I expereinced was slight and worth the $ I saved by not buying R-12 and doing it myself.

98 Joes · 05-30-2004, 09:25 AM

I agree with replacing the dryer and the o-rings. I converted my BMW over a couple years ago and it's worked flawlessly without replacing the compressor. It blows as cold as the Runner does with factory R-134 in it. Most auto stores sell a conversion kit that includes refrigerant, oil and the fittings to do the job. Highly recommended mod. Especially with summer coming. One thing to remember is that you only use about 80% R-134 as compared to R-12 (2 lbs of R-12 = 1.6 lbs of R-134 as a rough estimate). I suggest buying the dial pressure gauge while your at it. It makes it a cinch to service later on.

Good luck and Be Cool

05-29-2004, 07:29 AM	#2 (permalink)
My99 Registered User Join Date: Nov 2003 Location: Fayetteville, AR Posts: 1,111	You don't need a new compressor, you just need new fittings, new R134, and new R134 compatible oil in your old compressor. __________________ Kyle H Current Yota: 86 4Runner - Daily Beater

05-30-2004, 09:25 AM	#4 (permalink)
98 Joes Contributing Member Join Date: Apr 2004 Location: Puyallup, WA. Posts: 160	I agree with replacing the dryer and the o-rings. I converted my BMW over a couple years ago and it's worked flawlessly without replacing the compressor. It blows as cold as the Runner does with factory R-134 in it. Most auto stores sell a conversion kit that includes refrigerant, oil and the fittings to do the job. Highly recommended mod. Especially with summer coming. One thing to remember is that you only use about 80% R-134 as compared to R-12 (2 lbs of R-12 = 1.6 lbs of R-134 as a rough estimate). I suggest buying the dial pressure gauge while your at it. It makes it a cinch to service later on. Good luck and Be Cool __________________ Doug '94 4Runner SR5 '98 Honda CBR600F3 SJR

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05-29-2004, 07:55 AM	#3 (permalink)
miket223 Registered User Join Date: Sep 2003 Location: Wenatchee, WA Posts: 246	I would replace the drier and any o-rings that get exposed from disconnecting refrigerant lines. The drier is only $25-30 from the dealer and they'll have the o-rings in stock. Everything else you should be able to get from an auto supply store. R-134a is roughly 5-15% less effective than R-12 at cooling. Based upon price and availability to the regular consumer, I would go with R-134a. The loss in cooling performance I expereinced was slight and worth the $ I saved by not buying R-12 and doing it myself.