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I have a 2003 honda civic ex with 110k miles that over heats after freeway speeds. The water pump and timing belt were replaced at 100k miles.The thermostat was recently replaced as well.

The interesting thing about this situation is that the car doesn't heat up when just driving around town. It is only noticed after 30 min+ of freeway speeds when the car is promptly stopped at a stop light or in traffic congestion. When I see the temperature gauge shoot up to hot (it moves faster than the second hand of a clock), I speed up if possible and it promptly falls back down to the normal operating temperature.

I have also noticed when the car is idling that the hot air blows cold air up until the car is moving again when then it returns to hot air. I have checked the coolant levels multiple times and it is normal.

Any suggestions would be greatly appreciated, I have no idea what to do next.

Ken
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1 Answers1

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IMO this classic low coolant level

Even if your coolant looks fine in your overflow tank it doesn't mean your cooling system is at appropriate levels or that there is not air in your cooling system.

Here is a perfect example of a similar situation.

When your car is cool, remove the radiator cap and check your fluid level.

If the fluid level is ok, start the car with the cap off. Have a friend rev your engine a bit and see if the fluid level drops and air bleeds out of the system. Fill the radiator accordingly. Wash, rinse and repeat this procedure until you can't add more fluid to the radiator and replace the cap. Once complete make sure your overflow tank is filled appropriately to the marks indicated on the overflow tank.

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DucatiKiller
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