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What would cause car to have no heat while idling but warm while driving?
Wiki User
∙ 15y ago
Air moving through the radiator cools the coolant which cools the engine. Even without the fan, if you are driving in cold temperatures the result can be very dramatic on the temperature of your coolant (and engine). Car manufacturers are more worried about overheating than about cabin temperatures (same coolant goes thru your heater core) and they usually sell the same cars in all climates. Here is an old Michigan winter trick: try putting cardboard or some type of tarp or bra in front of the radiator. Watch your temperature gauge, though. It it starts getting too hot you might want to make it smaller or cut a hole in it to provide more air.
Wiki User
∙ 19y ago
Wiki User
∙ 15y agoon the hoses going to the heater core there is a gate valve that connects to a vaccum switch it came apart you have to reconnect them back so the switch will open the valve and let the hot water through again . this worked for me.
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