Volvo XC70 This wagon/SUV crossover offers the capabilities of an SUV without SUV size.

A/C Clutch Won't Engage

  #1  
Old 07-18-2018, 08:00 PM
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Default A/C Clutch Won't Engage

Air Conditioning clutch won't engage, ie, no Air Conditioning. I don't believe I have an issue with freon, however. I had an electrical spark at the driver's side cabin fuse box which simultaneously knocked out my CCM (Climate Control Module). I replaced the CCM but now I can't get the A/C to turn on. Just trying to make sure there isn't a specific relay for the clutch. I did look at the schematics, but I am not that good at looking at them. I don't think I saw a fuse or relay for the clutch, but could have missed it.

Does anyone know of a relay for the A/C Clutch on the compressor?
 
  #2  
Old 07-18-2018, 08:50 PM
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There is a relay for the clutch in the fuse box under the hood. I'm not sure why you replaced your CCM. I just happen to have an 05 model XC70 here at the house that we bought for the car lot. I checked and fuse #8 under the hood controls the AC compressor but also the accelerator pedal and another feature.

The relay is labeled as FM 11 also in that fuse box. The diagram under the lid shows which relay it is, specifically, a rectangular one. The others are more square.

Which fuse did you blow?
 

Last edited by tony1963; 07-18-2018 at 08:55 PM.
  #3  
Old 07-18-2018, 09:18 PM
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Actually, I was only checking the fuses for another issue when, as I pulled the fuse out, a spark occurred. No fuse I could find was actually blown. I also replaced the FMI1 relay, thinking that might help, but so far, nothing.

Maybe I am suffering from the same issue where the other CCM from another car is not being recognized even though it otherwise appears to work properly.

Regarding the spark at the fuse box. Seems weird I know. Looks like a previous owner of the car had some type of fuse with a pin sticking out which allowed for continuous power for some other device...I assume a radio or something. Since that was a weird fuse, I am suspicious it might have been the source of the spark. Of course, the CCM going bad could have been a coincidence with the spark I saw, but the timing was perfect.
 
  #4  
Old 07-26-2018, 08:12 PM
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Well, you are going to have to do a more exhaustive diagnostic on this one. We had a Mercedes come in that had no power to the secondary air pump. The fuse was good. It was a maxifuse. However, no power.

When I jumped power directly to the pump, it ran. I traced down the main power source and found that the electronics module was fried on that circuit. Looking more closely, someone had put a 50 amp maxifuse in the module. The module actually came from another car because the headlight circuit was fried in the original module.

Coming to the point, we installed another module and this time the secondary air pump circuit was in tact. Whatever car that replacement module came out of must have had a bad air pump and someone just put a larger fuse in and fried the circuit.

Try putting power directly to the AC compressor and see if it engages.
 
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