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EXCESSIVE PRESSURE ON COOLANT CIRCUIT??? 850

posted by  RUIAMARO on  Sun Oct 27 02:24 CST 2002
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last visit: Wed Sep 3 13:35 CST 2014
[RELATED]

AFTER REPLACING, IN THE LAST FOUR MONTHS, THE TOP TUBE, A CRACKED COOLANT RESERVOIR, AND A CRACKED RADIATOR, DOES ANY OF YOU HAD A SIMILAR PROBLEM.
IS IT POSSIBLE THAT THE HEAD GASKET IS BLOWN. I HAVE NOTICED THAT THE VENTILATOR TURNS ON OFTEN, AND THAT THE SYSTEM LOSES PRESSURE FROM ONE DAY TO THE NEXT ONE. IT DOESN'T LEAK COOLANT. THE TEMPRATURE INDICATOR NEVER PASSES FROM MIDWAY UP. THE LAMBDA LIGHT IS ON FOR SOME TIMES.

94 855 T5







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    EXCESSIVE PRESSURE ON COOLANT CIRCUIT??? 850

    posted by  someone claiming to be Dave on  Mon Oct 28 00:02 CST 2002 [RELATED]

    I wouldn't assume "bad head gasket" just because you now think the radiator cooling fan comes on at times. The fan comes on due to temperature, not pressure.
    The "check engine" light has nothing to do with cooling system pressure either, not related.








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      EXCESSIVE PRESSURE ON COOLANT CIRCUIT??? 850

      posted by  RUIAMARO on  Mon Oct 28 01:24 CST 2002
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      last visit: Wed Sep 3 13:35 CST 2014
      [RELATED]

      thanks for your reply.
      my thought, was that pressure from the cylinders was passing to the coolant, and heating it more than usual. as for the lambda light on, i thougt of coolant passint to the exhaust and the probe detecting it (oxigen).








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        EXCESSIVE PRESSURE ON COOLANT CIRCUIT??? 850

        posted by  someone claiming to be Dave on  Mon Oct 28 16:33 CST 2002 [RELATED]

        If THAT was happening, you'ld be blowing coolant from the bottle and probably overheating. It's not common and I've ONLY seen that on 850s where the owner damaged the radiator from hitting something, cracking the plastic side tanks, lost alot of coolant and severely overheated the engine by driving it low on coolant (red radiator light on too).
        THAT condition can be properly diagnosed by using a "block tester" which any experienced engine tech has. It detects carbon monoxide in the cooling system.
        The O2 sensors only detects O2, not carbon monoxide. There's many reasons why a check engine light can be on but cooling system problems usually isn't one of them unless it's overheating or the ECT (coolant temp) sensor is NG.








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    EXCESSIVE PRESSURE ON COOLANT CIRCUIT??? 850

    posted by  Moregolf on  Sun Oct 27 04:48 CST 2002
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    last visit: Tue Apr 22 07:55 CST 2008
    [RELATED]

    Could be. You might want to look a the dip stick and see if there is any condensation on it. (Hope not) Thermostat OK?







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