Question about Audi A6

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So, on my 2000 AUDI A6 2.7T I have now replaced the waterpump, the thermostat, the timing belt, the tensioners, guides and still the car overheats. The mechanic says the heads could be blown, so we put 500ml of Loctite Block and Head sealer in to see if this will work before we embark on the next expensive head gasket replacement cure. I had the heads done 25000kms back, and do not drive this car hard. Could they have blown again and can Loctite Block and Head Sealer solve this problem?

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  • Audi Master
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WELL CHECK THE ENGINE OIL.IF IT LOOKS LIKE MILK SHAKE. THE HEAD GASKET IS BLOWN.YOU CANT USE LOCTITE BLOCK AND HEAD SEALER TO PATCH UP.IT WILL STOP UP THE HEATER CORE AND RADIATOR.WHEN ENGINE OVER HEAT CHECK TO SEE IF COOLANT FAN TURNS ON IF NOT.CHECK FUSE.IF FUSE GOOD HOT WIRE THE FAN TO SEE IF IT RUNS.IF NO FAN MOTOR BAD IF FAN RUNS.YOUR THERMO SWITCH IS BAD OR THE COOLANT TEMPERATURE SENSOR BAD.IF YOU HAVE THE CLUTCH FAN.WHEN ENGINE HOT CLUTCH FAN SHOULD HAVE RESISTANCE. WHEN YOU TURN IT BY HAND. IF NOT THE CLUTCH FAN FREEWHEEL ALL THE TIME FEELS WOBBLY FAN CLUTCH NEED REPLACING.

Posted on Jul 15, 2010

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  • Yuri Grant Roper Jul 15, 2010

    The oil is not milky, but the mechanic did a chemical test that turned from blue to green which he says is the head gaskets. He recommended that we drain the radiator after he put the Loctite in, to see if it worked. My car has 3 fans - 1 for aircon, 2 for radiator (1 electric, 1 viscous), the electric fan comes on when the car overheats, but the larger viscous fan does not. Should this fan come on as well? The aircon fan comes on instead.

  • Jonah Oneal Jul 15, 2010

    THE CLUTCH FAN SHOULD HAVE RESISTANCE WHEN YOU TURN IT WITH HAND WHEN ENGINE HOT.SHOULD NOT BE LOOSE AND FREE WHEEL.HAVE RADIATOR FLUSHED OUT IT CORES COULD BE STOPPED UP NOT ALLOWING COOLING TO CIRCULATE THROUGH IT TO REMOVE THE HEAT FROM COOLANT.

  • Jonah Oneal Jul 15, 2010

    IF YOUR CLUTCH FAN IS THE ELECTRIC HYDRALIC IT SUPPOSE TO COME ON WHEN ENGINE AND TRANSMISSION GET A CERTAIN TEMPERATURE THE PCM WILL TURN IT ON.YOUR CLUTCH FAN IS A MECHANICAL FAN WHEN THE SILICONE OIL GET HOT INSIDE IT CAUSES THE THERMOSTAT COIL INSIDE TO EXPAND TO PUT DRAG ON FAN CLUTCH SO THE FAN LOCK IN DIRECT DRIVE TO COOL THE ENGINE.THE FAN NOT SUPPOSE TO FREEWHEEL IT SHOULD HAVE RESISTANCE WHEN ITS HOT.

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