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A leaking heater core will cause the engine to overheat because the coolant is leaking out.
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.
No, a clogged heater core will not make it overheat. A leaking heater core will.
The car's engine will soon overheat without some kind of fluid in the radiator. I'm taking off my coat before I overheat.
water pump may not be worn out, heater core may be clogging
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.
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.
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.
The battery runs a fan that pushes air through the residual engine heat in the heater radiator into the car.
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
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.
No