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Thread: Don't think my heater is working?

  1. #1
    Join Date
    Oct 2005
    Location
    Durban, South Africa
    Posts
    398

    Default Don't think my heater is working?

    Howzit Guys,

    I don't think my heater is working too well. Last night I had it on, and it blew hot air like it should. This was for a few minutes while going to pick my sister up from work. Then it went cool and only luke warm-ish air came out. Any idea what this could be? My blower only works on the 4th setting, I know this is the 'sword' issue I prsume. Just it's hard to find a replacment here.

    Anyone know how to fix the heating issue though?

    Many thanks!
    Car: BMW 525iA.
    Engine: M20.
    Trans: Auto.
    Year: 1990.

    Location: Durban, South Africa.

  2. #2
    Join Date
    Dec 2003
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    baton rouge, loserana
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    6,922

    Default

    the electric pump under the heater valves may be dead, easy to test with a couple wires
    all america wants is cold beer warm cat and a place to take a poop with a door on it

  3. #3
    Join Date
    Oct 2005
    Location
    Durban, South Africa
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    Default

    Thanks, Winfred.

    Any idea on where it is and how to test it?

    Many thanks.
    Car: BMW 525iA.
    Engine: M20.
    Trans: Auto.
    Year: 1990.

    Location: Durban, South Africa.

  4. #4
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    Dec 2003
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    baton rouge, loserana
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    Default

    it's mounted under the heater valves and has a 2 wire plug, hook it to the battery and it should run, not positive if it's in the same place on your car but on usa cars it's right next to the fuse box, the heater valves have a 3 wire plug for the left and right sides of the car and usually fail in the full heat position
    all america wants is cold beer warm cat and a place to take a poop with a door on it

  5. #5
    Join Date
    Dec 2004
    Location
    Sydney, Australia
    Posts
    4,374

    Default

    Quote Originally Posted by winfred
    it's mounted under the heater valves and has a 2 wire plug, hook it to the battery and it should run, not positive if it's in the same place on your car but on usa cars it's right next to the fuse box, the heater valves have a 3 wire plug for the left and right sides of the car and usually fail in the full heat position
    If your car did not have separate passenger and driver heat controls it could be a valve actually is stuck.

    They are very unlikely to both stick at the same time...

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  6. #6
    Join Date
    Dec 2003
    Location
    Wellington,New Zealand
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    Default

    in a rhd dr car the pump is in the same place,directly under the valves,which are under a plastic cover next to the fuse box
    Gone but not forgotten

  7. #7
    Join Date
    Oct 2005
    Location
    Durban, South Africa
    Posts
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    Default

    Thanks guys.

    Well I took a look there and it seems to be working now.
    Car: BMW 525iA.
    Engine: M20.
    Trans: Auto.
    Year: 1990.

    Location: Durban, South Africa.

  8. #8
    Join Date
    Oct 2005
    Location
    Durban, South Africa
    Posts
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    Default

    Okay, now it's not working. Seems to only work when it feels like it. Is this a case of it being the heart is getting stuck or what?
    Also I can't seem to get the A/C working. I might be doing something wrong. I press the A/C button in and turn fan on which only works on the 4th setting due to the sword being broken i think and i get warmish air though. How can i tell is a/c is actually turning on or off?
    Car: BMW 525iA.
    Engine: M20.
    Trans: Auto.
    Year: 1990.

    Location: Durban, South Africa.

  9. #9
    Join Date
    Dec 2004
    Location
    Sydney, Australia
    Posts
    4,374

    Default

    Quote Originally Posted by Rob
    Okay, now it's not working. Seems to only work when it feels like it. Is this a case of it being the heart is getting stuck or what?
    Also I can't seem to get the A/C working. I might be doing something wrong. I press the A/C button in and turn fan on which only works on the 4th setting due to the sword being broken i think and i get warmish air though. How can i tell is a/c is actually turning on or off?
    Pull the sword and try the re-soldering trick that many people have posted about... pending your best inspection of the transistors/circuit board first.

    Join the Aussie
    540i LE yahoo forum

    08/88 535i e34 M30+miller MAF, 'stiens, tints & teeth!

  10. #10
    Join Date
    Oct 2005
    Location
    Durban, South Africa
    Posts
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    Default

    What's the re soldering trick you're talkingh about? first I've heard of it?

    Thanks a lot for the help!
    Car: BMW 525iA.
    Engine: M20.
    Trans: Auto.
    Year: 1990.

    Location: Durban, South Africa.

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