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Thread: 01 M roadster running hot

  1. #1
    Join Date
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    01 M roadster running hot

    Hi all,

    I had my M for almost 2 years. I don't drive the car much but everytime I drive the car notice that temp gauge gets well past half way mark when it's not even hot out. Checked coolant level it looks good. Car is completely stock. Anything I should do?
    96 2DR SILVER M3 ***SOLD***
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    01 M Roadster - Stock

    87 Buick Turbo T
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  2. #2
    Join Date
    May 2017
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    Have you had any reason to add coolant recently (and maybe had an air lock in the system)?

    T-stat working ? If it is stuck closed, the coolant won't circulate through the radiator.

    Waterpump? Similar problem if the impeller is not pumping coolant through the system.

    Greg
    Tally Ho


    http://wcwebs.net/johnson
    1988 O'Day 322 sailboat - (unlimited mpg)

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  3. #3
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    Never had to add coolant. I assume thermostat is working because I have heat. How do I check water pump? It's not leaking.
    96 2DR SILVER M3 ***SOLD***
    MODS:
    JC INTAKE
    SOFTWARE
    UUC SSK

    01 M Roadster - Stock

    87 Buick Turbo T
    A LITTLE OF THIS........TRY ME!

  4. #4
    Join Date
    Jan 2011
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    Quote Originally Posted by 2gns4me View Post
    everytime I drive the car notice that temp gauge gets well past half way mark when it's not even hot out...Anything I should do?
    ?!? Don't drive the car again until you've gotten to the bottom of the gauge reading hot for one thing.

    Quote Originally Posted by 2gns4me View Post
    I assume thermostat is working because I have heat. How do I check water pump? It's not leaking.
    Don't make any assumptions in diagnostics.

  5. #5
    Join Date
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    The dash gauge is both heavily dampened and inaccurate. Normal is a few degrees left of center, and it takes another 20C to make it move farther. Quit guessing and put a real gauge on it. An OBD2 scanner will be fine.

  6. #6
    Join Date
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    OP, when you say the temp gauge, you are referring to the coolant temp gauge in the instrument cluster, not the oil temp gauge in the console, right?

  7. #7
    Join Date
    May 2017
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    2000 BMW Z3 M Roadster
    Quote Originally Posted by 2gns4me View Post
    Never had to add coolant. I assume thermostat is working because I have heat. How do I check water pump? It's not leaking.
    My understanding (and maybe I am wrong) is that the T-Stat is going to open to flow coolant to the radiator once the temp gets up to operating temp. Until then, you are going to have warm coolant flowing in the block and thof heater.

    If the T-stat is stuck closed, you never get coolant flow through the radiator...and she will overheat.

    I dont think "heat" means your thermostat is working.

    How about checking the temp of the radiator hoses once the car is warmed up, or check the radiator itself (non-contact thermometer shoud work. If they are not hot, I would assume that the T-stat is not opening, and could be a source of your overheating.

    Just my guess.


    Greg
    Tally Ho


    http://wcwebs.net/johnson
    1988 O'Day 322 sailboat - (unlimited mpg)

    2000 BMW Z3 M Roadster (25 mpg - but who cares)

    2019 Subaru Outback
    (30+ MPG)

  8. #8
    Join Date
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    M Coupe
    Quote Originally Posted by rf900rkw View Post
    The dash gauge is both heavily dampened and inaccurate. Normal is a few degrees left of center, and it takes another 20C to make it move farther. Quit guessing and put a real gauge on it. An OBD2 scanner will be fine.
    This... Hit it with an infrared gun
    99 M Coupe
    99 996 Cabrio
    86 Saleen Griggs Road Race Car

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