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Originally Posted by grey88gt
Not trying to start anything with you Phil, I agree on everything you stated, except for the 19psi on the low side. Ive seen alot evap cores freeze up at that psi. May be an exception around here because the humidity is so high. Never the less great instruction here on how to properly fix an AC system.
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grey88gt,
Well, you're gonna' have to argue with the automakers on that one! Many R-134a cars have pre-set cycle switches that can't be adjusted and guess what.........they're set to cut out the compressor at anywhere between about 19 and 22 psig.
If you're system is charged with R-134a and the evaporator is freezing up with the cycle switch adjusted to cut-out at 19 psig, then more than likely the system is slightly undercharged!
Here in Michigan the humidity is pretty high too. Never yet had an R-134a evaporator freeze up at 19 psig.
Sure you're gauges are accurate?
Phil