I'm stumped. Vehicle is a 2003 Dodge Dakota 4.7L. I had a bad clutch on my OLD compressor. That was the only thing wrong, no internal compressor damage/debris. The insides were very clean. I had a trusted mechanic replace with a NEW (not reman) compressor, new accumulator/dryer, and new orifice tube. Vacuum pump for 1 hr, all was perfect. No leaks. Pag 100 oil and R-134a only (no stop leaks, dyes, added junk). System capacity is 30 oz. He added 36, and was monitoring gauges appropriately.
My a/c blows cold. But the compressor has been short cycling excessively. I took it back and asked if it was overfilled. He hooked everything up and said yes, but not by much (temp did go up about 8° from initial service). He let out about 3 oz. It still short cycled. So I let out about another 2 ounces on my own. Still no change. I only have a low pressure gauge, so I am half blind. But what I can see is when the compressor engages, it starts around 29 psi and drops quickly to about 24, where it stays for about 30 seconds before stopping. When stopped, it gradually rises to about 48-50 psi over about 10 seconds, then re-engages and repeats.
What could this be? I know this is a classic under-filled symptom, but if anything this is a little over. Bad compressor? Sensor? Still overfilled? I'm tired of not running a/c in 95°/90% humidity because I don't want to damage my new system. Thanks in advance!
My a/c blows cold. But the compressor has been short cycling excessively. I took it back and asked if it was overfilled. He hooked everything up and said yes, but not by much (temp did go up about 8° from initial service). He let out about 3 oz. It still short cycled. So I let out about another 2 ounces on my own. Still no change. I only have a low pressure gauge, so I am half blind. But what I can see is when the compressor engages, it starts around 29 psi and drops quickly to about 24, where it stays for about 30 seconds before stopping. When stopped, it gradually rises to about 48-50 psi over about 10 seconds, then re-engages and repeats.
What could this be? I know this is a classic under-filled symptom, but if anything this is a little over. Bad compressor? Sensor? Still overfilled? I'm tired of not running a/c in 95°/90% humidity because I don't want to damage my new system. Thanks in advance!