PTC Supplemental Heater
 

What does it do? I see that I paid $250.00 and have no idea what it is for.

It makes the heater blow hot air before the engine is warmed up. Makes the cab warmer quicker.

Ah, then it has been a very good friend of mine. The hero behind the scenes.

Thank you

do you guys know how the supplemental heat works? I'd *love* to be able to retrofit something similar onto my 7.3. It takes a good 25 minutes for me to stop shivering in February.