I was told that a mechanic does something between the a/c and the heat in the engine compartment. What does that mean?
He probably changes the heater core or checks to see if the heater core is circulating the coolant through. If the blower is not working he will check the Resistor and plug near the heater blower under the dash. Both are under the dash. have you replaced the thermostat ? If you do, after refilling with coolant, bleed the sysytem using the bleeding screw at the outlet of the thermostat until only coolant comes out.
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