Reply to "R12 capacity"

panteradougMember

The important temp is what is blowing out of the register.

Take a meat thermometer and stick it in the duct vent.

Traditionally R12 can give you about 32 degrees there. R134a maybe as low as 39.

That's the important temp. That is what is blowing across the condenser.

You don't have to change anything going to R134a. Just put it in and it will work.

When it first came out as a substitute around '93 or '94, the instructions said it was not compatible with the R12 oil and the condenser needed to be enlarged.

I'm not arguing that those instructions are incorrect, I am saying that after using R134a in all my cars, including my 68, R134a works fine.

Haven't even blown a compressor head gasket or a hose because of the higher pressure...not yet anyway and it has been 20 years!

7/17/131:30 PM

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