[oisiaa]

I have a ScanGaugeII plugged into my OBDII port and it seems like the engine temperature is higher (about 225 vs. 218) when I have the climate control set to max heat. Does the thermostat purposely keep more heat in the engine when using the heater?

 

[oisiaa]

In my diesel the engine seems to run in the low to mid 80C range except when climbing a long steep hill behind another vehicle when I have seen as high as 91C. Outside temperature seems to have no affect on it. Mind you we don't have a lot of times when the heater actually turns on, it is mostly the cooler that is on.

Wow, the diesel really runs cool! That's only 176F!