Puzzling problem! Clutch does not engage
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Joined: Apr 2005
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Puzzling problem! Clutch does not engage
I have a 1994 Motorhome with a 7.5 liter engine.
I just charged the system with R134a and Leak tested ok by a professional.
However, the clutch will not engage when plugged into the wiring harness. If I wire it direct to the battery, it runs, and everything appears checks out ok. I checked the ground wire on the wiring harness and can use it with the positive from the battery and it will run. The strange thing is that I have 14.12 volts at the witring harness but it will not engage the clutch when plugged into the compressor???? I don't understand. Can anybody help? By the way, being a motorhome, we had to do this outside in about 32 degres F tempreratures. Would there be a temperature sensor that would prevent the clutch from engaging?
I just charged the system with R134a and Leak tested ok by a professional.
However, the clutch will not engage when plugged into the wiring harness. If I wire it direct to the battery, it runs, and everything appears checks out ok. I checked the ground wire on the wiring harness and can use it with the positive from the battery and it will run. The strange thing is that I have 14.12 volts at the witring harness but it will not engage the clutch when plugged into the compressor???? I don't understand. Can anybody help? By the way, being a motorhome, we had to do this outside in about 32 degres F tempreratures. Would there be a temperature sensor that would prevent the clutch from engaging?
Elder User
Joined: Nov 2005
Posts: 654
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Originally Posted by noel
I have a 1994 Motorhome with a 7.5 liter engine.
I just charged the system with R134a and Leak tested ok by a professional.
However, the clutch will not engage when plugged into the wiring harness. If I wire it direct to the battery, it runs, and everything appears checks out ok. I checked the ground wire on the wiring harness and can use it with the positive from the battery and it will run. The strange thing is that I have 14.12 volts at the witring harness but it will not engage the clutch when plugged into the compressor???? I don't understand. Can anybody help? By the way, being a motorhome, we had to do this outside in about 32 degres F tempreratures. Would there be a temperature sensor that would prevent the clutch from engaging?
I just charged the system with R134a and Leak tested ok by a professional.
However, the clutch will not engage when plugged into the wiring harness. If I wire it direct to the battery, it runs, and everything appears checks out ok. I checked the ground wire on the wiring harness and can use it with the positive from the battery and it will run. The strange thing is that I have 14.12 volts at the witring harness but it will not engage the clutch when plugged into the compressor???? I don't understand. Can anybody help? By the way, being a motorhome, we had to do this outside in about 32 degres F tempreratures. Would there be a temperature sensor that would prevent the clutch from engaging?
Tuned
Joined: Feb 2003
Posts: 495
Likes: 0
From: Cincinnati, Ohio
Put some gauges on the system and get the clutch engaged and read the pressures. As Snoman indicated you might have a high pressure switch and/or a low pressure switch staying open. By reading the pressures you should be able to diagnose the problem. High cutout is probably at 300-350 low probably 20-25.
John
John
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