Jimmy825 Posted February 3, 2021 Share Posted February 3, 2021 I have a 97 RD688s with an E7 350. When driving along when cold outside, my temperature gauge does not go up very much and if I idle, the heat I get goes cold. If I put a piece of cardboard in front of the radiator, it gets warmer and on a hard pull, it will get up to 180 to 200 and then level out after the pull back to around 130 to 140. But if I idle, it blows cold. I bought a winter front recently and will try that but I was wondering if it may have a stuck open thermostat. Or does a Mack just run cold all the time. I have never experienced a truck having an issue like this Quote Link to comment Share on other sites More sharing options...
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