New engine A/C
I could never get the engine A/C in my 1987 El Capitan to work right. It would cycle too much despite being charged, and didn't put out cold enough air. My solution? Take everything out except for the...
Forum Discussion
atsrmf wrote:
R-134 rings are green and can be used with either refrigerant. R-12 rings are black and can only be used with R-12. As far as I know, black o-rings aren't made anymore.
The o-ring acts as the seal, or gasket, in the fitting. Tightening the fitting does not improve the seal.
Flare fittings depend on 2 metal surfaces mating to make the seal, therefore the connection has to be tight. This makes it more prone to leakage.
R-134a works on higher pressures, and the molecule is smaller, therefore the seal must be better than R-12. ALL R-134a fitting are made for o-rings.
What I was questing was your statement "You cannot use R-134a in an application where there are R-12 fittings, or it WILL leak."
Why won't R12 fittings work with R134A?
Richard
