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#1
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AC not working, any ideas? 2005 X5 4.4
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
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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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1988 325is (purchased new) sold 2004 X5 3.0 2005 X3 2.5 2008 X5 3.0 (new to me) |
#3
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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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#4
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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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2006 Infiniti G35 2001 BMW 3.0I E53 X5 Build date 08/2000 SOLD Lotus Europa 1970 Destroyed by fire Lotus Europa 1970 S2 Renault Powered Lotus Type 52 1970 Twincam Webers Powered PORSCHE 911 Targa 1982 The Garage Queen Audi Avant donated to Kars for Kids BMW 525IT Sold Audi 4000CS Quattro Sold Jensen Healey Lotus Powered Sold Opel 1900 Sold Triumph Spitfire 1971 Sold Triumph Spitfire 1968 Sold Plymouth "Cuda" 340 Six pack SOLD |
#5
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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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