08 uplander clutch will not engage
The ac compressor will not engage intermittently. Occasionally it will come on and works perfectly. I recently replaced the compressor, well everything except the rear evaporator. That leaves the ecm and harness. Originally the compressor stopped making pressure and hence the replacement. I need to know about the high pressure switch control of the ecm. Control unit in dash was replaced. What should the voltages be on those three wires and any other thing that would tell the ecm to shut down.
Brian |
How about the condenser cooling fan? If the fan is not working, it will not condense the refrigerant back to a liquid. Pressure will be too high and the clutch will not engage.
Check for a seized fan, blown fuse, wiring issue or fan motor issue. |
Originally Posted by mpyrol
(Post 428927)
The ac compressor will not engage intermittently. Occasionally it will come on and works perfectly. I recently replaced the compressor, well everything except the rear evaporator. That leaves the ecm and harness. Originally the compressor stopped making pressure and hence the replacement. I need to know about the high pressure switch control of the ecm. Control unit in dash was replaced. What should the voltages be on those three wires and any other thing that would tell the ecm to shut down.
Brian Brian |
Originally Posted by KChevy75
(Post 428948)
How about the condenser cooling fan? If the fan is not working, it will not condense the refrigerant back to a liquid. Pressure will be too high and the clutch will not engage.
Check for a seized fan, blown fuse, wiring issue or fan motor issue. |
A/C is still working now in September.
|
Originally Posted by mpyrol
(Post 428927)
The ac compressor will not engage intermittently. Occasionally it will come on and works perfectly. I recently replaced the compressor, well everything except the rear evaporator. That leaves the ecm and harness. Originally the compressor stopped making pressure and hence the replacement. I need to know about the high pressure switch control of the ecm. Control unit in dash was replaced. What should the voltages be on those three wires and any other thing that would tell the ecm to shut down.
Brian |
Originally Posted by mpyrol
(Post 434950)
A/C is still working now in September.
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