Question about 1998 Volkswagen Jetta

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I have a 01 Jetta, the car is overheating while driving

I have a 01 Jetta, the car is overheating whille driving down the road but cooling down when we stop, we went to a mechanic and he said from hearing the problem he thinks its the water pump, but its 400 dollars to fix so i want to make sure thats the problem, we put on a new thermastat because that is initially what we thought the problem was, but it is still doing the same thing, whats my problem?

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I just went throught the same thing on my 98 VW and It was the water Pump, The Impeller actually failed. It is press fit on the shaft of the Pump. The Pump was turning but the impeller was not. I tried the Radiator flush and the Thermostat before going here for the same reasons that you mentioned. 400 of them.
Sounds counter intuitive that it would over heat when moving but cool when stopped. But tht it the same thing mine did.

Posted on Aug 09, 2009

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That water pump could be a factor but i dont think thats the problem doesnt make any since as it would most likely cause the car to over heat no matter what you may have a clogged radiator or a bad temp sensor those both can cause any car to act in those ways you have to understand what a thermostat does before replacing one it allows water that has been cooled to run back in the motor to substain a regular running temp that and would cause the car or truck to over heat all the time if not working right and it would not cause in irregular reading if its out it doesnt work just half way the one way is to have a prssure test done to see if the pump is moving when the engine is running the best to do this is with engine completly cold un hook a hose and tap start the motor to see if water is forced out or not

Posted on Aug 02, 2009

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Before investing in a water pump, make sure you don't have a blown head gaskeet. Check the oil; if it resembles a milk shake or if you're getting a lot of white smoke from the exhaust, the head gasket is blown and changing the water pump would be a waste of money. If the oil is fine and you don't have white smoke coming from the exhaust, then $400 is a reasonable price for a new waterpump..
Hope this answers your question. Best of luck.
Greg

Posted on Aug 02, 2009

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    Greg Margossian Aug 06, 2009

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Yes it sounds like the water pump to me.$400 is quite expensive i would have thought.Get anouther quote for the job.good luck.

Posted on Aug 02, 2009

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