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There's not really alot that can affect both the gauge and the heater output other than overcooling as a result of the thermostat not correctly regulating the flow of coolant. If it's not then I'd...

Agreed, at 18 psi or 1.2 bars, it's still ok for the engine and you'll only be getting this pass 3500 rpm (I hope). This is the main difference between a PWM controlled signal (like those going to...