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Weird humming noise & over heating while sitting in traffic

I have a 2001 VW Jetta VR6, I have had the water pump & thermostat replaced, radiator, block and heater core flushed and I am still getting the humming noise and over heating. Only happens when sitting in traffic. I turn the heater on full blast to try to cool down the engine. The fans have been checked and are working fine. Mechanic can't seem to figure out the problem and I can't afford to keep paying him for maybe's. Once I start moving, it cools down, but starts to heat up again when I am sitting. My commute is a little over an hour, this happens about 40 minutes into my commute, but only when I am sitting in traffic, never when I am cruising along. Any ideas?

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  • pmdbentley Nov 18, 2008

    I am not sure if it was rusted. The mechanic didn't say. I mentioned to him about the head gasket when I first took it to him and he said Jettas are known for their water pumps going out. I trusted that was the problem. If it was the head gasket all along, were all those things replaced for nothing?

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You might want to check the tention on the belt that drives the water pump, also give the pully for the water pump a good shake to see if the bearings are starting to go, the impeller blade may not be able to keep up at idle RPM

Posted on Nov 18, 2008

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The humming is the noise the coolant makes when the car overheats and forces open the relief valve in the radiator cap and flows through the small hose to the recovery bottle., it you had all this work this done only 2 things can cause the issue, one is a problem with the cooling fan, the other is a blown head gasket, which I suspect is the problem, before you flushed the system was the coolant rusted?

Posted on Nov 18, 2008

  • yadayada
    yadayada Nov 18, 2008

    U didn't waste your money, those repiars/maintence are normal items and need to be done every 60,000-100,000 miles or so, the head gasket can be verified with a gas sniffer that detects hydrocarbons or a there are strips that you put in the coolant to detect head gasket leaks, any full service parts store will have the test strips.

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