1994 Mercury Grand Marquis Q&A
1994 Mercury Grand Marquis Question: heater
my heater doesnt work it wont heat at all - Visitor
If your heater is not blowing cold, you can focus on two separate systems. 1) Is the engine itself getting up to the proper operating temperature? If the termperature is not hot enough, heat will not blow. Also, you could have a restriction in the heater core. Check the inlet and outlet hoses for how hot they get. They should both be very hot. Be careful of course when checking this. 2) You could have a temperature blend issue inside the car, which keeps the cold air from getting shut out of the ventilation system when calling for just heat. If the blend door motor does not work, it will not close the cold side and open the hot side (which happens at the same time on the same door). This motor failure is fairly common. Look at your engine temperature first, then look on the inside. Good luck! - DaveJHM
make sure the heater hoses are hooked up and getting hot both of them while the motor is running. If they are then its probably a blendoor not opening . - scooter50
Having issues with the heater as winter is approaching. So, I've done some research and unable to find exactly what I need....
The heater core leak
The heater hose outlet may leak coolant at the back of the intake manifold. Sometimes this is misdiagnosed as a leaking intake manifold gasket because it resembles a leaking manifold.
Hi, I'm looking for the installation procedures to install a new heater core in a Mercury grand marquis 1993 v8
how do i get my heater core from under the dash. i have remove everything except for my steering wheel.