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Temperature Gauge Quick Check...(m) (archive)

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Posted by bmv on March 04, 2001 at 09:01:51:

In Reply to: temperature gauge going funky posted by Stan on March 04, 2001 at 01:51:38:

Stan,

  • Here's part of what Bentley's says, 170-3:

    "If the gauge reads too high
    when the engine is cold,
    disconnect the connector from
    the sender. Turn the ignition
    on. If the needle position does
    not change, the wiring or the
    gauge is shorted to ground. If
    the gauge needle drops, the sender
    is faulty and should be replaced..."

  • Air trapped? Based upon the limited info you gave, you may have some air trapped in the system. Topping off to the "Kalt" line doesn't do enough. Assuming, of course, that there aren't any leaks:

    When the engine is cold (overnight), and on a level surface:
    First, loosen the radiator bleed screw;
    Second, fill with coolant 'til it overflows, and tighten bleed screw (carefully!);
    Third, bring to operating temp., and loosen bleed screw for it to relieve any excess coolant;
    Lastly, the next day, then, top-off to Kalt line, if needed.

    It might be a good idea to check the level every morning for a while to see if yours is *happy* at a level slightly below the Kalt line...Just so long as your needle isn't in the red zone, it's ok.

  • Bad Thermostat? At operating temp., is the hose from the thermostat to the radiator warm to the touch?

  • Aux. Fan not working? Turn on the A/C. You might have to insert an object (very carefully!!) to check.

    ~bmv

    PS We had an overheating problem recently with our 5/98 1.9. It's funny (well, sorta), how the Service Rep. -- who helped me with the process of elimination -- described some of the Z3's components. To wit: Thermostat = "Notorious"; Radiator = "Cheap sh/t plastic that BMW uses".





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