Question about 2003 Honda Civic

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2003 civic overheats at idle, ok when moving, fans are working

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If it's an old radiator thats been in there for a long time it's probably dirty and just needs a good cleaning/flushing. sometimes it will get a bubble and overheat so flushing is a great idea.
When you are moving, enough air passes through the radiator to keep it in the normal range.But at idle with little or no air moving across the radiator it's limited capacity to cool because of it being dirty makes it overheat. And it would also be a good idea to replace the thermostat while you're at it. Good luck hope this helped

Posted on Apr 25, 2010

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Sounds like the fins radiator is plugged with dirt and not enough air can flow thru it. Try blowing it out with compressed air

Posted on Apr 25, 2010

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01 Audi tt quattro starts to overheat while idling but coils down after driving at higher speed, is it a thermostat or the fast relay switch


overheats at idle only are typically the fan system. Cars use the fan to pull air across the radiator for cooling. Any speed over 10 mph there is more than enough natural wind to do this without a fan. If the problem immediately goes away when you start moving, it is probably a malfunction or issue with the fan. I have on more than 1 occaision had a customer tell me they had the fan replaced and car was still overheating, and it ended up thje fan was spinning backwards or not turning on because of a fuse or relay issue.

If it doesnt cool down fully once speed is above 20mph for more than 30 seconds, there may be other issues like plugged radiator or weak water pump impellars. water pump is a fan that moves water instead of the air. if the blades wear, they still kinda work, but at idle they work poorly because the broken blades only move a little air at low speed, rev the engine up, they spin faster and work better. If the fan is functioning OK (Turns on and off by itself) and car still runs warmer at idle than at rev, water pump may be worth investigation.

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1 Answer

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3 Answers

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1 Answer

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2 Answers

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1 Answer

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