jjcuff1 Posted May 24, 2007 Share Posted May 24, 2007 tried new cap, purged system, (no flush or thermostat yet) But city driving AC on or off no problem. stays at 50% or less as soon as I get to 70-80mph straight highway driving it gets pegged. I turn the heat on full blast and it drops to 70% but still creeps up at highway speeds as soon as I get off the highway it drops to 50% again AC or heat on/off do not matter over the long drives it is heat related? I suspect the water pump? at city driving it is seeing rpm changes and therfore moving, maybe at steady rpm it is stalling? I hear no squealing from it though. I am going to backflush and replace thermo. oh after I stopped while still hot with AC on both fans are working. i have a 94 s Link to comment Share on other sites More sharing options...
cranny Posted May 24, 2007 Share Posted May 24, 2007 thermo sticking shut sounds like off hand. its also very possible your rad is rotten , have a look at the fins , see if they just crumble away. Link to comment Share on other sites More sharing options...
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