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Posted on Aug 15, 2008
Answered by a Fixya Expert

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Over heating bug guy

After reading your answer i found that my fan wasn't even working, unless i had the heater on. i asked a dealer and he said it could be the water pump, but my over flow box has boiling hot water in it. so i was thinking if the pump wasn't working then the water in the over flow box should be cold right. dose the water pump control the fan. i thought there was i temp thing that turned the fan on depending on the temp of the car. the dealer want 200 to look at it.

  • Aaron Nov 02, 2008

    My 2002 Gti 337 is starting to get hot. The fan doesnt turn on until the temp reaches 230. Not sure if the water pump is bad or the thermostat.

    Any tips on airbleeding the coolant?

  • Ralf Feb 27, 2009

    My car was running fine until one day the "STOP. Check coolant" light came on. No smoke or anything. I drove it another quarter mile to the next repair shop / gas station.

    There was liquid dripping from the bottom. So I thought it must be coolant and a cracked hose or so. The mechanic tested the car the next day and said there are no leaks and he thinks it would be the thermostat (he wanted $300 to fix it). I took the car to bring it to a friend 1.5miles away and fixed it with a friend ($26 repair cost).

    We drained the coolant, but I am not quite sure if we did it the right way. We turned on the car and waited for the car to heat up ....90F ....and after 25-30min the indicator climbed pretty quick to ~190F and stayed there. Another 10-15min later the indicator started to climb again and we saw that coolant in the reservoir started to boil and spill. At the same time the heat in the car wasn't working. Just pretty cool air is coming in (cold weather outside).

    Is it the waterpump or is it just air in the system or what could it be? Any help / ideas are really appreciated.

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  • Master 6,966 Answers
  • Posted on Aug 15, 2008
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Hi,

Appreciate the "Ask Me"

Some thoughts:

  • if the pump is not working or the thermostat is stuck closed, the water will not circulate, engine would be very hot but the radiator and/or the coolant reservoir would be comparatively cold;
  • the water pump is mechanically driven by the belt and has no electrical connection therefore it could not switch anything on or off;
  • in your vehicle, the fan is controlled by two switches; a thermal switch on the radiator and either the heater or the A/C switch. Either must be engaged for the fan to work on reaching a certain temperature.
  • in my country being in Asia, we normally remove completely the thermostat (not applicable in cold weather) and hard wire the fan to be always on when the engine is running.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards. Thank you for using FixYa.

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