Climbing steep, winding  Mexican grades, when my engine gets REALLY hot--I
can keep the temp guage needle where it belongs--just by driving with the
heater on.

My '85 never overheats at highway speeds, but she'll heat
up quickly in prolonged stop & go city traffic or doing steep grades in low
gear--especially when weather's warm.

"Cooling" the engine with the heater gives an extra measure
of controll & protection.
Sometimes I wish for a teflon sock, but it works!

Phaedra