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Thread: Blown fuse F63 of air-condition

  1. #1
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    Lightbulb Blown fuse F63 of air-condition

    Hi all experts
    BMW E46 318I engine N42
    my AC climate unit does not turn on found that Fuse F63 was blown out , I changed the fuse and the fan blower does not start and when I press the AC button the fuse blown again.
    I need the wiring harness of the AC ,can any body post a screen shoot of it here?

  2. #2
    dworthy's Avatar
    dworthy is offline Wagon meister :) BMW Tech Expert
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    Fuse #63 is for the A/C compressor relay. What I would do is see what is spiking on the relay. Not knowing if this is a euro spec or british spec, as the relay is in different locations AFAIK.

    What you can do is search for "BMW WDS" as that is the wiring diagrams for our cars. I have WDS only for offline on a XP Pro computer, otherwise it won't work.
    Darin
    Current:
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  3. #3
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    Quote Originally Posted by dworthy View Post
    Fuse #63 is for the A/C compressor relay. What I would do is see what is spiking on the relay. Not knowing if this is a euro spec or british spec, as the relay is in different locations AFAIK.

    What you can do is search for "BMW WDS" as that is the wiring diagrams for our cars. I have WDS only for offline on a XP Pro computer, otherwise it won't work.
    than you for your reply, it this fuse for the relay circuit or for compressor circuit ?

  4. #4
    dworthy's Avatar
    dworthy is offline Wagon meister :) BMW Tech Expert
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    Yes, it is. So you could have a relay gone bad or the clutch itself to the wire running from the relay to the clutch. I would say you have a couple of tests to perform to figure out what has gone bad.

    How I would handle it would be like this:
    1 Remove relay and see if the fuse blows
    2 Test relay while out to see if it is good
    3 Test the wire to the A/C compressor, but first unplug the wire.
    4 Lastly check the clutch.

    Good luck, I would say most of the time it is the relay.
    Darin
    Current:
    16 220i Active Tourer Platinsilver MET (C08)/Dakota Black (PDSW), P7ACA, P7LDA, P7LHA, P9BDA, 6sp Manual - Wife's new toy!
    05 325it Electric Red(438)/Gray(N6TT) ZCW, ZSP 5sp Manual Back set cover, trunk mat, Euro Infra-Rot front windshield, and mud flaps! Mr. Wagon My new Winter car.
    05 M3 Imolarot II(405)/Gray(N5TT) ZCW, ZPP 6sp Manual C.F. Lip, CSL diffuser, SSK, Euro Infra-Rot front windshield and a trunk liner! Mr. Go_Fast Stored for the Winter
    Past:
    95 318is Montreal Blue Met (297)/Beige(K1SN) RIP, killed by an Idiot.
    84 M535i gray market Burgandy Rot Met/Black Leather Lowered by Intrax on bilies, poly everywhere, B&B cat back system, K&N, and a hitch! Da Beast - Still running w/400k+!
    91 316i euro Tizianrot/Gray cloth - E-36 w/M-40 RIP, but great on gas! Best was 38 MPG
    82 528i euro Saphire Blue Met/Blue Leather RIP
    79 525 euro Green/Green RIP
    79 318 Silver/Black - The first one that got it all started
    M-Flight Member

  5. #5
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    I would start by checking the insulation on the wire on top of the compressor. The short wire from the connector to the clutch (wire coils under the pulley) often has cracked or entirely missing insulation.

    Another likely area for problems is the wire from the body to that connector. If it's routed incorrectly the insulation can wear through.

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