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  View original topic: Water temp fluctuations
vwdevotee Wed Jun 07, 2006 10:15 am

I can be driving along and my coolant temp will be steady, about middle of the gage, and it will all of a sudden start climbing, almost all the wa y the big scary red zone at the top, and then, not half a block later, it will return to normal? What's up? Has anyone seen this behavior before? Should I just blow the car up and save myself the misery?

plasticman1432 Wed Jun 07, 2006 11:46 am

More than likely it's a coolant temp sensor going bad.........but it's hard to speculate anything without knowing what car you're dealing with.

xiqtem Wed Jun 07, 2006 3:54 pm

I had the same problem with my 84 gti and it turned out that a pocket of air got into the system and would cause a hot spot wherever it happend to be and when it was by the water temp sensor it would register hot. I fixed it by idleing the car and putting more water/antifreeze in whenever the level went down in the tank with the filler cap.



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