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Use of R134 expansion valve on R12 system

cooldude on Sun May 25, 2008 1:31 PM User is offline

Year: 1993
Make: Toyota
Model: Camry
Engine Size: V6 3vzfe
Refrigerant Type: R12

I am replacing parts to renew my camrys a/c. I will charge with R-12. The expansion device that I purchased says "R-134a" on the side. Can I use that? Should I?



bearing01 on Mon May 26, 2008 2:24 AM User is offline

Your expansion valve looks like this, correct?

That flying-saucer thing on the top is the internal power element bulb which is filled with, in this case, R134a vapor. This enclosed vapor will pressurize/expand based on the refrigerant temperature exiting the evaporator. The vapor expansion, in the bulb, pushes on an internal diaphram to open/close the expansion valve to regulate the superheat in the evaporator. You want this type of expansion valve to have its power element charged with the same flavor of refrigerant as what's used in the evaporator. Otherwise the evaporator superheat won't be properly regulated and the evaporator won't operate as efficiently as it should, causing cooling capacity to go down.

Edited: Mon May 26, 2008 at 2:26 AM by bearing01

cooldude on Mon May 26, 2008 11:30 AM User is offline

Thanks. My device looks exactly like that. I ordered from NAPA and the desciption makes no mention of refrigerant type. As I said below it has "R-134a" on the side of it. I think I will return it and try to find one for R-12.

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