druhl Posted June 11, 2005 Report Share Posted June 11, 2005 My 97 STS has about 180,000 miles on it and runs great. The other day I was driving on the highway and the fan kept cutting out when I went up hills. It was a very hot and humid day about 90 f. It has been giving me trouble from time to time. It was worst than ever the other day though. It somtimes sounds like a jake brake on a truck, which I think is the valve in the heater box vibrating. I have checked for a vacuum leak but have found none. The tank does not have a leak in it and the check valve is good. I have check the system over with a vacuum gauge. I have a feeling it is the rings. Does anyone have any ideas. thanks Dan Link to comment Share on other sites More sharing options...
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