1999 Mercury Mystique Heating problem?

Q: was wondering if anyone has any thoughts on a heating issue on this car. I have replaced two thermostats, and a resister that was bad on the blower motor and still no heat. anyone think that the heater core is partially blocked? running out of options with this. feel free to give me some pointers on this thanks

A: If the issue is no heat even though the blower is working and the controls deirect the airflow to the proper places, then it could be a heater core. However, the most overlooked issue is not fully bleeding the air from the system or low coolant level, especially after replacing a thermostat. Another possible cause is a worn water pump impeller - low coolant flow. You don't say what engine this has, but it is common on the 2.0L 4 cyl. It can happen on the v-6 as well. It might be nice to know how many miles the vehicle has and when the problem started.

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