Q: Does a blocked heater core make the engine over heat

asked by on October 16, 2016

I am getting no heat in the cabin and the heat Guage goes to the red zone then will drop back down and then rise again.I have replaced the thermostat but still have the same problem .so I'm wondering if the heater core is blocked or if I should replace the water pump

My car has 197000 miles.
My car has an automatic transmission.

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