In a message dated 98-05-21 14:49:31 EDT, you write: > Why is this? The heater core under your dash and if you have a rear heater, under your rear seat, is essentially a radiator like the one mounted behind the front grill of the bus. Therefore turning on the heat runs the engine coolant through these "extra radiators" transfering the heat from the coolant to the passenger compartment. Since the heat is being taken from the coolant by blowing air through these "radiators" the engine temp will drop slightly or dramatically, depending on conditions. This is a normal condition. Also helpful if your automobile is overheating due to stressful conditions like hill climbing-- crank on the heater full blast and help that coolant and therefore your engine get cool. You may sweat a bit. But it beats overheating. I should add, if your engine is continually running too hot and needs to be regulated by turning on the heater something is amiss. And this situation should be checked out. Best O- Jeff 83.5 Westy |
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