Quote:
Originally Posted by JRMichler
This has nothing to do with a hotter thermostat. It means that the old thermostat was not fully closing, so the engine warmed up slowly. If a thermostat is fully closed, the engine will warm up at the same rate regardless of the thermostat opening temperature.
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Could be, I don't remember if the old mk 2 Jetta heater core was on a separate line from the thermostat.
The big question, is:
Have you had any experience raising the coolant temp to increase MPG? If so, this is the place to share that experience.