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  #21  
Old 07-22-2019, 08:41 AM
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Bumping an old thread but my AC has problems.

3.0d facelift, compressor starts only after kickdown is performed (3000 rpm). And it really blows cold air after that nicely, but if you try to turn the AC on idle, pressing the flake does nothing, the hot air continues to blow. I guess the problem is in the clutch, right?
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  #22  
Old 07-22-2019, 04:36 PM
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Have you verified that the aux fan is working? Symptoms sound like aux fan isn't working....
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  #23  
Old 07-23-2019, 08:07 AM
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Quote:
Originally Posted by wpoll View Post
Have you verified that the aux fan is working? Symptoms sound like aux fan isn't working....
Aux fan is replaced with new recently. AC was working even with the old non working aux fan. I just found out the problem is not connected with the rpms or even the clutch. It just works intermittently. If it starts it alwaya works through the day. It just doesn't want to start in the beginning. Dunno if this could be a sensor or something. Freon is also filled up to maximum in the system.
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  #24  
Old 07-23-2019, 06:54 PM
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Do you have a variable displacement compressor? The valve is set so that there is the least amount of drag on the engine when it is at idle. Could be that the solenoid that control the valve is not allowing the compressor to go to it max displacement so refrigerant is not being pumped through the system.
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  #25  
Old 07-24-2019, 02:55 AM
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I have no clue about a solenoid valve on the compressor. If there is such present it's plausible. The system is behaving strange, I've tried both to start it using INPA diagnostic, and it just doesn't want to, and if you drive a bit and it just starts randomly, after that you have all the cold air in the world. Diagnostic says IHKA is working correctly and the signal is given for a start when you press the flake. But neither the AUX fan, or compressor starts. No error codes as well are present.
So far I've eliminated the following:
  • AUX fan (replaced with new)
  • IHKA control unit (has been replaced in 2011 by the previous owner with brand new)
  • Not enough freon or pressure (system was filled and tested in the dealership for leaks)
  • Compressor clutch (it doesn't make sense to behave like this if it's bad)

Will check compressor ground when we lift the car next week. It could be some kind of sensor maybe...?

Last edited by zboost; 07-24-2019 at 06:25 AM.
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  #26  
Old 07-25-2019, 02:29 AM
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After some more observation the problem seems to be the variable compressor valve/solenoid as symptoms are a lot similar to all with that - when car has stayed for a while, cold starts after 5-10 minutes of driving, or driving in high rpms sometimes manages to build the pressure. The AUX fan doesn't kick in until the cold starts blowing, and compressor compressing.
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