Question about 2002 Volkswagen Jetta TDI

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Overheating in slow traffic. suspect front fan

Overheating in slow traffic. suspect front fan not working. is there a known issue with this?

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Yes,it is the fan switch,and it is in the radiator hose

Posted on Jul 12, 2010

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  • Master
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Temp sensor probably bad. You can listen for the fan at idle or just open the hood and look to see if its turning.

Posted on Jul 12, 2010

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Had the 2011 Nissan Xterra work done. Ran codes and found the connecter wasn't plugged in right. Had it corrected and reset. All tests are good. Drove home temp show little high. Safe to drive to PA?


No --- any rise in temperature is something to be taken seriously
If it has a viscous fan hub ( fan clutch) I would be suspecting it first
if it is not working properly then overheating will show up in slow moving traffic , stop lights
basically any place where there is no air flow through the radiator
do all the checks first for your own peace of mind

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A possibility is the water pump. This is what circulates the water through the engine and back to the radiator for cooling. Water pumps consist of several vanes attached to a rotating shaft. If a few vanes are broken, you'll get reduced water circulation, causing overheating.

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If the over heating is occurring at idle at lights , long slow pulls under load, slow moving traffic, I would be investigating the fan drive system. If it is a viscous fan hub I would have it replaced. If it is a horton fan clutch ( air controlled ) system I would be looking at the clutch and control for the air. Other than that, pressure test for coolant leaks, check for over fuelling ( turbo not working properly) and a compression test to check for gaskets and cracked head

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1995 Honda Accord, 4 cylinder, overheating issues. Only overheats when in stop and go or slow traffic. No obviously leaks from the radiator. It's also brand new. Both fans come on when the temp gauge...


You may have air in the system, find the highest spot in the cooling system .Try open a hose and if there is a bleeder opening that.If it overheating at low speeds it is a water flow problem(volumn). I would suspect a bad water pump or a thermostat stuck partially open.The timing belt drives water pump and if it is loose then that could be a problem.if you replaced the radiator because of rust then the blades on water pump could be worn.Rust is abrasive.

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3 Answers

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check the electric radiator fan, either its not working or turning too slow

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Sounds like your theorem stat might need changed

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Are you quite sure it is not overheating? Your mention of heavy traffic, ie. stop and go, would tell me that your radiator fans are not working. I had a car with bum electric radiator fans. It worked fine if it was moving a lot. But in slow traffic, it would get warm enough to have a vapor lock or something without setting the engine-hot light.

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