Question about 1994 Audi S4

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The temp guage rises fast in normal driving conditions. The coolant rises to boiling temps all of the time.
So far we have replace the thermostat, water pump, fan clutch, coolant, flushed the radiator, and still it over heats.
Is this a common problem with Audi or have I missed something??

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  • earlberg Sep 12, 2009

    Thanks for the advise.

    System is completely full, 5 ltrs of coolant filled then run, then topped up and ran again.
    I am using a good grade synthetic oil.

    With everything I have already R&R'd could the problem stem soley from a plugged CAT or EGR valve that is not operating properly?



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Is the system completely full? DId you fill up the system while running, with cap off. Burping radiator hose while filling, Then wait til thermostat opens and sucks coolant from radiator to engine block, then fill system again? Try changing your temp sensor. Make sure it is 50/50 mix and you can also use thinner 5w30 or synthetic oil. Synthetic adjust to the temp. Also a K&N filter or cold air intake will help. Same with more open exhaust. Check that your CAT isn't plugged. Make sure EGR valve is opening allowing fresh air to cylinders.

Posted on Sep 12, 2009

  • Nate Stansfield
    Nate Stansfield Sep 12, 2009

    low coolant
    stuck thermostat
    bad temp sensor or circuit
    bad hoses
    bad water pump
    plugged exhaust
    Low oil pressure or thick oil
    lack of air flow
    radiator fan or relay faulty
    plugged egr


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