Questions & Answers for: Mercury Grand Marquis heater not working

...working properly also. I'm stumped. if the heater hoses are hot on both sides(indicating the engine is at full temp) and you feel the heat controller in dash is working properly, i would suggest ...

...working. Also a broken valve to the heater core. A vacuum leak, or faulty actuator would cause the door not to function. You can narrow down the problem somewhat by making sure that both heater hoses ...

Car heater stopped working and door locks, looked at fusses and it isn't the problem heater fan not working

heater does not work check the heater core tubes (2 of them at the firewall) for heat. If cold, then the heater core is plugged up and will have to be flushed out, or replaced. Check the heater fan to

...working, all I get is cold air, I've changed the thermostat and flushed out the heater core but still no heat, what could be the problem vacuum line not closing the flapper door or the heater control ...

In a 2002 Mercury Grand Marquis where is the resistor for the ac/heater located. I understand it is somewhre on the passenger side behind a firewall. How do I get to it to replace it/ Thank you Hello,

1998 mercury grand marquis heater doesnt work only cold air comes out the air cond works fine the enginecoolant is new, the engine doesnt overheat. Either your heater control valve is not properly ...

...actuator damaged not working. if one of the heater cores hoses one leading to heater inlet but out let hose to heater core cold more likely heater plugged need have coolant system

heater not working heater does not seem to provide any warm air but appears to be providing cool air Feel your heater hoses. If both are hot, the heater core is circulating coolant, and the thermostat

Heater core and blower is working but still no heat what is the problem is both your heater hoses near the firewall hot? is so then it sounds like one of the doors in the blower system is not working ...