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A leaking heater core will cause the engine to overheat because the coolant is leaking out.
No, a clogged heater core will not make it overheat. A leaking heater core will.
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.
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.
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
No
Usually, you'll get antifreeze on your passenger floor, steam out the defrost and / or have a very noticeable sweet coolant smell in the car. The heat won't work well and the car will overheat.
no, it will not
yesYes when an air bubble makes it to the water pump the water stops circulating and there for you will over heat and the heater core will no longer produce heat through the cars heater vents.
No , this coolant is coming from your heater core and you are losing engine coolant ; you need to have this repaired because the engine will overheat and suffer damage that will be more expensive than the repair of the heater core .