I've got a 2004Envoy with 5.3l. I just put a reman a/c compressor, had system evacuated, and refilled. It just don't blow real cold? Its cold, but not cold like the old R-12 was. Is this normal?
Thank you for your answer! That's about the temp I'm getting. I just thought it would really crank moving! Warm/Cool at idle. Cool not cold moving. But that's cool, I just was wondering if I could make better. I'm happy.Yeah it should be between 38-45 moving and 50 at idle.
You are not kidding! I could get snowflakes out of my 1973 Olds! The old torpedo compressers. R-12, I knew her well!This problem is exactly why I always suggest the "Intelligent Expansion Valve" for R134a.
It is capable of changing the orifice size to compensate for thermal loads - all by itself.
But - no matter - the system can only get as low as the freezing point of water - depending on the local humidity factor, elevation and air density at that moment. 32°F is not usually achievable in an AC system.
The problem is that if it is freezing the humidity out of the ambient air, the evaporator will ice-over and stop working.
38°F-45°F is a very good range to hit - at the evaporator.
After the chilled air flows through the admix plenum, it will pick up latent heat from the heater core and the ducting anyway.
The reason why you cannot get to less than the 'preset-approved temp' is that the whole system freezes up and the passenger's compartment gets warm.
But yeah --- R134a is a urine-poor substitute for R12 or Ammonia.