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Q: Why does your car overheat when heater is off?
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Will a leaking heater core cause your car to overheat?

A leaking heater core will cause the engine to overheat because the coolant is leaking out.


Would a heater core in a 1995 Honda accord make it overheat?

It could, but I'd start by checking the timing. If it's off the car will overheat, and that's easy to adjust. Heater cores are a grade-A pain to replace because you have to take apart the dash to get to them.


Could a Heater core on a 1500 Chevy will it make it overheat?

No, a clogged heater core will not make it overheat. A leaking heater core will.


A sentence using overheat?

The car's engine will soon overheat without some kind of fluid in the radiator. I'm taking off my coat before I overheat.


Why would a 1984 Town Car overheat when you use the heater if you changed the thermostat six months ago?

water pump may not be worn out, heater core may be clogging


Why does car over heat and water fog up windshield And the smell of antifreeze stong in car?

Typical of the heater core leaking. Overheat because of low fluid and pressure. Foggy windshield due to heater core leaking and will smell antifreeze in the car.


If Heater core is bad on a 1984 Mazda GLC will car overheat?

Not necessarily. It depends on what you mean by a bad heater core. The core will either be leaking or stopped up. If it is leaking, then it can cause the engine to overheat and the only fix is to replace it. A clogged or plugged heater core can sometimes be fixed by flushing it. You can also temporarily bypass the heater core until you can get it fixed. Just connect the inlet & outlet heater hoses together.


Car heater blows cold air when not driving?

A car heater taps off engine heat. If you aren't driving, then the engine is cold and there's no heat for the car heater to use.


Why does car heater work when car is off?

The battery runs a fan that pushes air through the residual engine heat in the heater radiator into the car.


What causes a 1997 Honda Civic to overheat if the heater is not on?

generally if an engine overheats, but then does not overheat when heater is turned on, is a good indication that the engine thermostat is stuck and needs replacing


Why heater fan motor won't turn off after car is turned off?

well for one is your keyed turned all the way off. But i would say you probably have a short in you wiring somewhere. But try turning off the heater while the car is running then shut your car off.


Would the motor overheat if you bypassed the rear heater unit?

No