I would only use the transmission heater on cold days when not towing a trailer.
600 watt heaters are too small, even two 600 watt heaters both running at a total of 300 watts could still be too hot. I am thinking more along the lines of using a 1500 watt heater and running it at 200 to 400 watts.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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