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fjasper · 03-09-2011, 04:09 PM

I guess you could put in a coolant temp switch that turns on a block heater when the coolant is below a certain temperature, say 150F, maybe. Run a 120v one off an inverter, or look for a 12v one. It wouldn't harness exhaust heat, but it would speed warmup (to an unknown degree).

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Whether or not it would help overall mileage may depend on the efficiency of the alternator, the relative efficiency gains of warmer coolant, driving cycle, etc.

03-09-2011, 04:09 PM	#49 (permalink)
fjasper Bookworm Join Date: Apr 2010 Location: Kalispell Posts: 127 Sylvio 2 - '04 Audi allroad quattro Biturbo 6-spd 90 day: 25.09 mpg (US) Atlas - '04 Audi allroad 2.7T 6MT 90 day: 25.09 mpg (US) Thanks: 7 Thanked 29 Times in 21 Posts	I guess you could put in a coolant temp switch that turns on a block heater when the coolant is below a certain temperature, say 150F, maybe. Run a 120v one off an inverter, or look for a 12v one. It wouldn't harness exhaust heat, but it would speed warmup (to an unknown degree). Like This Whether or not it would help overall mileage may depend on the efficiency of the alternator, the relative efficiency gains of warmer coolant, driving cycle, etc. __________________ Last edited by fjasper; 03-09-2011 at 04:15 PM.. Reason: Added link.