I have a 1989 Blazer that is running on R12. Just last week it was blowing so cold, it would get down to 37 degrees and make my fingers numb at night. Now the best it will do is 50 degrees. I put the guage on and it said 45psi, which is what it was always at. I do notice the compressor makes a racket like it is going to blow apart, but stops when I spray water on the condensor. What could the problem be? Too much charge, clogged orifice??
What's the high side pressure?
45 psi low, 280psi high. If spraying water on condenser, it will be 40 psi low, 220 psi high. Will also blow 35 degrees driving in heavy rain, but once the rain stops, back to the lame 50-60 degrees again. Should I have the R12 recovered and try Envirosafe's Industrial 12A instead. Someone told me it blows way colder.
Key parameters with pressures, both high and low are the ambient temperature and relative humidity plus engine speed, for your engine a constant 1,500 rpm. Just specifying your pressures without these other parameters given is worthless as the low side can vary anywhere from 18 to 75 psi with these other variables.
Just because you read a pressure does NOT tell you that you have not lost refrigerant. 65% of mobile a/c system complaints are due to as leak. I'll bet if you recovered the refrigerant in your system, you would have less than half of the specified amount......this is based on having done thousands of a/c repairs just like yours... the number one diagnostic bit of info you can have is to know how much refrigerant you have in the system. The only way to know thisis to recover and weigh the recovered refrigerant. You probably have a shaft seal leak and shell o-ring leaks on the compressor.
The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......
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