Question about 1992 Audi V8

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My car is overheating

I have change the water pump i had the radiator check , i have had the engin compretion check for gasket leak i have had the thremastat change and the rediator inlet and out let hose are ok but it still over heat when you are driving it it will not over heat when it is sitting running . i dont know what elce to do to solve this problem
Many thanks Mr Kent

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  • 218 Answers

Check and make shure the fan is cycleing proprly

Posted on Jun 05, 2010

  • Richard Scordino Jun 05, 2010

    Overheating while driving is likely caused by a partial obstruction in the radiator or an external obstruction of the air conditioner condenser in front of it (bugs , leaves etc). Unlike older cars, frontal area on newer vehicles is limited and therefore every bit of the radiator is necessary to keep the engine from running too hot. A few random core passages being obstructed internally are difficult to find, as coolant will simply go around them making flow appear to be normal.
    At idle, your fans provide sufficient air flow to keep everything cool. At speed, your fans essentially do nothing as the vehicle speed provides sufficient air flow. However, at speed the cooling system needs good coolant flow in order to get rid of the heat...at speed the engine is working harder and making far more heat than when at idle. Limited coolant flow will then cause an overheat.
    One thing to double check though is to have a hydrocarbon test done on the cooling system.
    A small head gasket leak may only be putting a very small amount of exhaust into the system at idle. Many times this can be purged without being noticed. While under power it will build up faster and cause problems. Your best bet though is with the radiator. Chances are that it's got some blockage inside that went undetected.

  • Richard Scordino Jun 05, 2010

    Overheating while driving is likely caused by a partial obstruction in the radiator or an external obstruction of the air conditioner condenser in front of it (bugs , leaves etc). Unlike older cars, frontal area on newer vehicles is limited and therefore every bit of the radiator is necessary to keep the engine from running too hot. A few random core passages being obstructed internally are difficult to find, as coolant will simply go around them making flow appear to be normal.
    At idle, your fans provide sufficient air flow to keep everything cool. At speed, your fans essentially do nothing as the vehicle speed provides sufficient air flow. However, at speed the cooling system needs good coolant flow in order to get rid of the heat...at speed the engine is working harder and making far more heat than when at idle. Limited coolant flow will then cause an overheat.
    One thing to double check though is to have a hydrocarbon test done on the cooling system.
    A small head gasket leak may only be putting a very small amount of exhaust into the system at idle. Many times this can be purged without being noticed. While under power it will build up faster and cause problems. Your best bet though is with the radiator. Chances are that it's got some blockage inside that went undetected.

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