Re: Temp gauge problems
You are likely setting a p0116 trouble code. The pcm uses ect temp and iat temp and after about 10 minutes of run time compares the two, if the ect temp is too high as per the pcm's calculations it set dtc p0116 and the temp gauge will default to cold and the ses light will come on. Very common with an aftermarket coolant heater as it raises the cold start coolant temp much higher than the stock block heater. Try just using the heater approx 1 hour prior to starting the engine so the coolant temp does not get too high
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