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Thread: 88 735i overheating - SOLVED

  1. #26
    Join Date
    Mar 2014
    Location
    Quezon City, Philippines
    Posts
    636
    My Cars
    '89 535i/5, '88 735i/5
    ^ Coolant temp sensor and sender have different connector colors. Blue goes to DME, black to the cluster.

  2. #27
    Join Date
    Jul 2010
    Location
    Westlake,OH
    Posts
    112
    My Cars
    1988 BMW 735I
    Shogun, thank you again for the links: I will go ahead and tackle the fuel sender problem. I'll keep you guys posted.

  3. #28
    Join Date
    Jun 2011
    Location
    NYC & Long Island & So FL
    Posts
    1,119
    My Cars
    '93 740il '84 633Csi
    Was the vendor of the defective new parts helpful for the returns?

  4. #29
    Join Date
    Jul 2010
    Location
    Westlake,OH
    Posts
    112
    My Cars
    1988 BMW 735I
    Yes, the vendor has replaced the defective parts without any problem at all: for the first defective visco fan they sent me another one, same make and model....for the second defective fan I was reimbursed. I just threw away the defective temperature sensor.

  5. #30
    Join Date
    Jan 2005
    Location
    Japan
    Posts
    54,654
    My Cars
    11/88 E32 750iL+98 E36M3
    I just read an interesting article on a German E34 forum, the temp gauge sometimes went from 12 o'clock to red within minutes. So the car owner panicked a bit and threw parts into the car one after the other and nothing helped: new radiator, new temp sensor, new water pump, new thermostat, several times bleeding the system etc pp.
    In the end it turned out that one of the 2 ground/mass points X490 close to the steering column had a lose nut and all the wires there sometimes had contact and sometimes not. He re-tightened the nut and had good chassis ground again, all problems solved
    Shogun tricks and tips for the E32 series are HERE!

  6. #31
    Join Date
    Jul 2013
    Location
    New Jersey
    Posts
    39
    My Cars
    1989 BMW 635CSI
    Does your 735i happen to be Alpine white jeanro?
    Last edited by G4DARE; 12-20-2017 at 04:37 PM.
    2001 BMW 330ci Convertible
    1989 BMW Schwarze 635csi Factory 5 Speed

    1988 BMW Alpine Weiss 735i Factory 5 speed - Sold
    1988 BMW Alpine Weiss 535is 5 Speed - Sold
    1978 SAAB 99 Notchback Coupe ProRally - Sold

  7. #32
    Join Date
    Feb 2019
    Location
    Usa
    Posts
    1
    My Cars
    89 BMW 735i
    I have an overheating issue as well on my 88 735i that I turned turbo. I have been reading on several different forums for bimmers. There is guy saying he changed his pump pully from the 140 mm to 110mm v belt pully and it solved his overheating issue. I haven't tried it yet due to not having a machine shop close by. But u could try that.

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