Hi, when I start my car it's up and running just fine: the temperature gradually increases to an optimal level. However, when I start driving at high speeds, my temperature mysteriously drops down to the lowest level. It goes back up when it is stopped. Can anyone tell me what is wrong with my car? I appreciate the help. Thanks!

JOhn

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sounds to me like your thermostat could be on the way out, and it's letting too much water into the rad. it's a pretty cheap part and easy to change so probably worth doing

yeah...mine was the same as yours too....that would be your thermostat like manphibian said. If you drive it too long it will over heat....i learned it the hard way...

yep thermostat