On the highway for hours on long trips, the car gets hot inside. AC removed- windows open. The heater vents are putting out a little heat and the center of the car is hot from passing engine heat through the hump.
Is there something malfunctioning in the heater system that is not stopping hot water from circulating in the heater core, with heater in off position? Any way to reduce engine heat in the cabin?

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!