I drilled two 1/8" holes in the thermostat, now the engine warms up nicely and doesn't go over 180 degrees. Next, I will fix the under 35MPH heating problem, by upgrading to 2 electric fans. A fan shroud is out of the question, no room. Right now I'm running one 14" fan at 2000 CFM, plan on using a 10" @ 1440 CFM and a 12" @ 1770 CFM that should take care of it, 3200CFM, even with the air on...Freeway speed is great at 160 to 180 all day long.