Heater blower motor will not shut off. have a 2006 Mercury grand marquis with climate control system. Turning system off will not shut it off. on high output all the time?
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If the blower motor won't shut off, pull the blower motor relay in under hood fuse box. That should kill it till you find the problem. I don't know if you have automatic hvac or manual hvac?
Can you check for hvac trouble codes? Some of the national brand auto stores will check codes for free.
If blower motor wiring connector has both voltage and ground, it will run as long as the battery has voltage.
I saw two different wiring diagrams on your blower motor, I don't know which one applies?
If the fan will not run on ANY speed in your Grand Marquis, the problem is most likely NOT the control switch.
Check for power and ground at the blower motor connector. If power and ground is present, replace the blower motor. Otherwise, the problem is most likely a failed blower speed control module (VERY common). The blower motor speed controller is located in the A/C evaporator housing just below the heater hoses.
Note: It is also common for a bad blower motor to CAUSE the controller to go bad. You MAY have to replace BOTH.
there is a motor regulator in the rear of the heater near to the motor when it fails only full voltage goes though other speeds are controlled by the resister. looks like this
its screwed into the heater box.
Ok you have a bad blower speed controller if you have power to the motor.
It is located under the hood in the heater housing just below the heater core coolant hoses.
You will have to drain coolant.
Remove the nuts holding the Vapor Management valve and set it aside.
Remove coolant hoses to heater core.
Disconnect electrical connector to the blower speed controller,remove screws,pull it out of heater housing.
The blower speed controller is located under the hood on the right or passenger side on the heater housing just to the side of the heater hoses near the very back of the right cylinder head.
Yes that would cause the concern you are having.
its screwed into the heater box.
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