Heater won't get hot. Thermostat is ok diverter door works. What else do I check

Asked by Nov 01, 2015 at 09:38 PM about the 2006 Mercury Grand Marquis

Question type: Maintenance & Repair

3 Answers


Check the heater control valve.


And you may have air in the system that needs to bled out, or a plugged heater core. Make sure the engine gets to operating temp. of 195 to around 200* to insure a good thermostat.


be sure your coolant in the rad and expansion bottle is topped up

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