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  #1  
Old 07-13-2018, 01:16 PM
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AC not working, any ideas? 2005 X5 4.4

Hello, my AC stopped working, just blows ambient air. Last year I replaced the variable displacement valve in the compressor, drier desiccant element, evacuated the system and recharged to factory amount. It always took 10-15 minutes to start blowing cold, even after I replaced the compressor valve. The clutch always engaged right away, but now the clutch doesn't engage at all. The system has pressure, 130 psi on both high and low sides (equalized pressure since the clutch isn't on and compressor isn't compressing). I can rotate the compressor by hand with no binding, seems like it should do something if the clutch would engage). My guess is something to do with control or a bad clutch coil. The 2005 X5 4.4L only has one fan, no auxiliary fan in front of radiator/condenser assembly, and it comes on when engine is hot, but the fan doesn't come on when the engine is cold and AC is on.
Could someone please tell me how to test the fan controls, and explain how it should operate as related to the AC system?
Also, where is the low pressure switch? I see the high pressure switch, but don't see any switches on the low side under the hood. Could it be under the dash near the evap core and expansion valve?
In general, how do I check the fan controls, and high & low pressure switches. Pretty sure I know how the check the clutch coil and need to do that first. Also, I checked the fuses and all are good.
Thank you!
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  #2  
Old 07-13-2018, 05:35 PM
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As far as I know the only pressure switch is on the high side and it is actually not a switch but a sending unit so that it can tell the IHKA how high or low the pressure is and operate the aux fan and compressor accordingly.
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Old 07-14-2018, 02:09 AM
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If it was taking time to start cooling, the compressor was failing, I used ICE-32 to ease the problem, but ended up replacing the compressor, I think yours just went Kaput...
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Old 07-15-2018, 10:52 PM
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Could be the air gap between the clutch plate and coil is great enough that the coil isn't strong enough to pull the clutch plate to engage the compressor. Turn on the AC and with the engine running give the clutch plate a little nudge. Does the compressor engage? Be careful as the clutch plate could suddenly engage and knock whatever you use to nudge it into you or so other parts of the engine.

Or if you're an old school DIYer, just take out a set of feeler gauge and see what the clearance is.
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Old 10-21-2018, 10:56 PM
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Finally had some time to look into this, the compressor clutch coil was bad. I was able to buy one on ebay and replace the coil without removing the compressor or opening up the system. The gap between the clutch plate and pulley is .014".
Thanks all for your help on this!
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