Model: Impala SS
Engine Size: 350 LT1
Refrigerant Type: R134A
Country of Origin: United States
My compressor is not engaging when I turn the AC on. The entire system is about 3 years old, I checked the fuses they are good.. Thought it might be the coil? Just to see I disconnected the connector on the accumulator and short across the terminals on the connector to see if the compressor would engage and it didn't. I checked voltage when I pulled the connector off the accumulator and had 12.79v. I also checked to see if I was getting voltage at the pig tail at the compressor and I am not?? No voltage at all.. Why would I not be getting voltage to the compressor? Relay? I did get a new one just in case but it made no difference
Edited: Sun June 24, 2012 at 8:00 PM by c6mcfall
Did you unhook battery for 10 seconds to reset low refrigerant code 46?
Did you have Autozone read your codes for a code 46?
Service engine light does NOT light for a code 46 FYI
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......
I will check it for codes tonight, I can hook it up to my laptop, no service engine light came on.. yet.
Ok I finally got around to checking this and I'm getting MALF error 66 A/C Pressure Sensor Open/Short, MALF 67 A/C Pressure Sensor Degradation errors
I reset and the codes go away, still no engagement of clutch. Now I get no MALF errors
I jumper connector on the accumulator and short across the terminals on the connector to see if the compressor would engage and it didn't
So?? Where to go from here...
checked the resistance of the coil.. connected my ohm meter to the connector and getting 4.2 ohms..
Ok, so I checked the relay, it's fine.. took off the cap, manually engaged and it worked. have 34 Low / 185 high side. Any ideas?
What is the pressure in system when its allowed to sit for a while? The value in psi should be about the same value as temperature in Fahrenheit.
I don't know if that sensor is a transducer or a switch... if it's a transducer, jumping isn't the right approach.
You can't jumper 3 wire sensors. GM likes to use sensors rather than switches. The multiple codes would indicate a bad sensor.
"Among the many misdeeds of the British rule in India, history will look upon the act of depriving a whole nation of arms, as the blackest."
~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446.
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