08 uplander clutch will not engage
June 2nd, 2019, 1:03 PM
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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
Brian
June 2nd, 2019, 5:20 PM
#2
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.
Check for a seized fan, blown fuse, wiring issue or fan motor issue.
June 3rd, 2019, 11:07 PM
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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
Brian
June 6th, 2019, 12:15 PM
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Back to work on uplander and everthing works as it should. I only drove 10 miles though. Fans cycle as they should. If it overheats it should show warning message on the display. When it does go out I have no ground at the relay from the ecm. I reckon I will get another new hi pressure switch. It can sit for a day and work or not hot or cold. Weird. Going to do a longer ride and let it stop working and check voltages again.
September 14th, 2019, 9:10 AM
#6
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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
September 14th, 2019, 9:11 AM
#7
CF Monarch