It everything was done correctly plus the controls are working then you will have an air pocket in the cooling system and you must bleed the system out to remove it..........
The heater cor was replaced but it is still not getting warm
Check into the temperature control valve--this is different than the thermostat.
If a thermostat is not working properly, you cannot calibrate it. It must be replaced.
Yes it can cause it to overheat but first check your thermostat. That would be the 1st cheapist thing to do before you did anything else. I got an 85 regal(overheating) and the thermostat or the heater core is the problem im getting them both replaced tomorrow and will let know of how it runs.
Thermostat probably needs to be replaced.
If you need a heater core, the one you currently have would be leaking. If the car is over heating or not getting warm enough, think thermostat.
Was the gasket replaced? Have you checked the hose and the heater core. Is everything tightened down?
heater core plugged or air locked check to see if hoses going to heater core are hot
MY CAR WAS DOING THE SAME THING NO HOT AIR COMING OUT OF THE HEATER I CHANGED THE THERMOSTAT. IT WASNT THE THERMOSTAT. I GOT TO CHECKING AND THE SEAL IN THE WATER PUMP WAS BAD. I REPLACED THE WATER PUMP AND IT WORKS FINE NOW.
Try flushing heater core Try flushing heater core
How did you change the thermostat?
The heater valve could be failing to open for one reason or another.