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Thread: 2001 BMW 740iL AC problems

  1. #1
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    2001 BMW 740iL AC problems

    BMW 740iL E38 I'm having a weird air conditioning problem / heat problem everything worked fine up until two weeks ago I had a slight coolant leak which caused a slight overheat with the air conditioning running sitting in a parking lot I did my coolant add. Bled everything out everything was back to working like normal, Ice Cold Air Conditioning red hot heat. now I only have an ambient temp outside temp through the vents that's with the AC on or if I switch it to heat and put it at 90 degrees everything stays outside temperature, blower motor works fine the AC clutch is engaging and staying on coolant is full, Freon is full, I put a gauge on it. I swapped axillary fans because I thought that was a problem and put it on a thermostat so it comes on and off now at a certain temp until I can get a correct 3-wire fan for the car but before I done the fan swap I was noticing my auxiliary fan was doing the shake symptom so I swapped it with one from an E46 but now I am stumped as to why nothing is working right. the outside temp is same as inside temp with control set down 60° or with the air conditioning off in a heat on in it to 90° nothing is changing and I did not have a problem with this till the last two weeks outside temp gauge is working its reading correct outside temp 81 degrees right now.
    Last edited by vinnysdubs; 09-20-2018 at 12:46 PM.

  2. #2
    Join Date
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    any help would be great as im stumped on this

  3. #3
    Join Date
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    99 840ci Sport Indv
    You really need diagnostics - INPA is pretty expansive on the IHKA problems. But, it does seem you have multiple problems - so I would start by disconnecting the battery for a couple of minutes to fully reset the IHKA.

    Set the drivers temperature to the highest setting and run the engine, do the heater pipes (the pipes that run to the heater matrix) get hot? They should do, and reach 90C or so.
    Timm..2007 E64 650i Individual Sport..1999 E31 840ci Individual Sport..ex owner of 2000 E38 740..1999 E38 740i V8 M62..1998 E38 735i V8..1993 E32 730i V8..1988 E28 518i


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