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Old 03-10-2011, 07:26 AM
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Join Date: Mar 2011
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Default 1998 Honda Civic Overheating...then back to normal!!


I am looking for some advice on my 1998 Honda Civic EX. This has been a great car and have got a ton of good miles on it. The problem that I am having now is with the temperature gauge. The measurement is completely all over the place while driving. While moving around town, the gauge shows the temperature VERY hot. As soon as I reach a consistent speed, the temperature drops back to normal (moves very erratically!). The gauge seems to get even hotter while idling.

Another issue (may or may not be related) is the heat coming out of the vents is only working while the car is in motion. While stopped, it pumps out cold air. The temperature immediately changes when I get going again.

Both problems seem to be getting worse.

The car has coolant, and all other levels of fluids are normal.

Any ideas??

Thanks for the time!

Eric T
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Old 03-10-2011, 08:04 AM
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Not sure about the temp needle jumping around while driving, unless it could be the temp sensor malfunctioning, or there is a serious air bubble in the system. Has the coolant system been tampered with recently? Can you see any leaking? Is the smoke coming from the exhaust whiteish?

Do you know if there is any oil in the coolant (you should be able to see the oil sitting on top of the coolant I believe), or coolant in the oil (milky brown oil)?

When idling, does your fan come on? If you are unsure, locate the thermostat housing (follow the lower to the back of the motor) and unplug the switch on that housing. Stick ends of a paperclip in the holes and then turn your key in the car. The fan should come on. If not, the fan is dead, or there is a wiring issue. If it does come on, there is a problem with the fan switch most likely.

I am sure there will be other members chiming in soon to help as well. Just make sure you do not drive your vehicle while overheating, or you risk blowing the HG and possibly warping the head.
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