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Old 03-23-2019, 09:46 AM   #16 (permalink)
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Originally Posted by JRMichler View Post
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.
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.
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