riordamp Posted February 2, 2006 Share Posted February 2, 2006 For about two years I have had this same problem. I will be driving down road in the winter and all of a sudden the hot air will become cool for a period of time. I can get the hot air to come back instantly simply by giving the temp control a quick twist. I have replaced the thermostat control and the radiator cap. Any ideas? Quote Link to comment Share on other sites More sharing options...
mehullica Posted February 4, 2006 Share Posted February 4, 2006 There is a vacuum switching valve (VSV) that opens the heater control valve. Check it and see it it actually applies vacuum to the heater control valve. Quote Link to comment Share on other sites More sharing options...
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