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#13: 08-14-2011, 05:04 AM
ehsnils's Avatar
Title: Kafka was an optimist.
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As I see it - the main reasons for the temperature to go wild is one of the following:
  • Dirt (like dandelion seeds or similar) in the cooling fins of the radiator - flush from the backside with a garden hose.
  • The thermostat. (Either it's bad or someone did mount a thermostat with a higher temperature than specified, which may be useful in areas with severe winter conditions)
  • The fan(s).
  • Bad head gasket or cylinder head.
  • Bad water pump.
  • Bad temp sensor. (do a separate measurement of engine temp to figure out this one)
And also - if you have something constricting the incoming air flow to the front side of the radiator. Stuff covering the opening below the bumper can make a large difference.

Also see:
A bad flow through the heater core can also cause problems.