Heater airconditioner blower motor runs all the time without ignition switch in run position . runs without the key in the switch. the only way to turn it off is to remove the fuse that powers the blower motor.no dealership or parts store carries the service manual. PLEASE HELP
Re: Heater airconditioner blower motor runs all the time...
If you haven't fixed this yet, your Blower motor resister module is bad. It is located to the left of the blower motor and mounted in the A/C air box. Just pull the right kick panel down and you will see it.
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A/C - Heater blower motor ! What make , model and year vehicle ? Manual or automatic climate control ? Could be a bad blower motor control module , a high blow relay contacts stuck closed .
its as if you have tapped into a live positive wire and earth wire but bypassed the switch and ignition
more wiring issues or falty switch
follow wires from motor to switch , ignition
behind fuse cluster if you have to
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.
the blower motor resistor is damaged probably in the process of removing the heater core replace the blower motor resistor, and please dont forget to rate me!!
there is no relay for the heater fan it's a 15 amp fuse and is on the accessories circuit. the reostat is responsible for all 3 speeds .with the key off there should be no voltage to the blower motor whether the fans speed fan switch is on or off. the fuse will be located in the fuse paneleither on the drivers left side in the dash or underneath the dash in the fuse block. you have a short in the harness that is under the dash and most likely it's a bad plug on the harness. your going to have to do some searching but that's where the problem short is... please rate
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