Question about 1997 Ford Thunderbird LX

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Heater blower won't turn off

Whenever the key is in the on position the heater blower run's at full speed and won't turn off with the switch, only turn's off when the key is in the off position. The only way to run the car is to remove the fuse for the heater.

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  • Anonymous Dec 16, 2008

    2004 Ford Explorer: heater blower motor runs at full speed and will not turn off unless vehicle is shut off

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    2004 ford explorer blower on high when key is turned on thanks

  • nyssababe Jan 19, 2009

    i have the same problem in my peugeot 205. how can i fix this.



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Most likely a blower resister which should be located under the passenger compartment

Posted on Nov 28, 2008


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I have a 2005 hyundai elantra heat blows cold air i changed thermostate and radiaor and blew out the heater core any sugestions

check to make sure the blend door is changing from cold to hot. With the engine off and the key in the run position set the blower motor to the highest speed. Turn the temp dial to full cold and wait 30 seconds. Now turn the temp dial to full hot a listen carefully. You should hear a difference in sounds as the blend door sweeps through its full range.

If it is working and the engine is fully warmed up feel the heater hoses where the pass through the fire wall. One should be very hot and the other should be pretty warm. If one is hot and one is significantly cooler than either the heater core is plugged or there is air in the heater core causing a block in flow.

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Heater fan runs on high all the time unless key switch is turned to off position.

Even with the mode switch in off position? The mode switch is tied into the circuit for the heater speed control switch.

Other than that, I don't know. Are you sure you replaced the right relay, the blower motor relay?

Oct 14, 2015 | 2001 Jeep Cherokee

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My heater won't turn on and has power to it

If blower motor has power but won"t run, blower may be faulty or the thermostatic switch maybe bad. If the thermostatic switch is bad, the blower may have 1 speed or in your case, no speeds at all. The thermostatic switch is usually located on top of,or on the heater box or housing if you will, most often times close to the blower. Will have a plug with multiple wires going to it.

Apr 26, 2015 | Cars & Trucks

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Heater blower won't turn off. Even when key is removed.

I would check ur blower resistor by the blower, idk if u had other problems before this like the blower only working on certain speeds but, but your problem could be the ignition switch and cylinder could be the contacts are keeping in run position

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Trouble shot heater switch and blower moter

You don't give much info, so it's hard to give you a good answer. Do you have power up to the heater switch and after turning the heater switch to the on position do you have power to the blower? Did you check the fuses, do you have power on both sides of the fuse? if you do follow that wire and check for power at the other end of it. Some cars have a temperature sensor and the blower will not come on until the temp. is warm enough so that the blower will not blow cold air. If you track the hot lead from the fuse box to the switch, through the switch and to the blower and at any point find you no longer have power, that would be the component I would think is causing your problem. You can also check the blower by running a test lead from the positive side of the battery to the blower motor and see if it runs.

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1 Answer

1996 buick riviera heater blower won't run. I jumped the motor and it runs. Turn on the switch and it won't run

you have a piece of solder broken off the controller of your hvac unit, causing power not to get to the blower motor it self. take test light and see if you have power at the blower motor. check and see if you have continuty or brake between the power wire at the blower motor and at the hvac control unit. if wires are good then the problem will lie in the hvac control unit. check and see if the blower is working at all speeds, if it works on some speeds thens the blower motor resistor.

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This is very common, this sounds like the blower resistor went bad, the blower resistor is what controls the fan speeds, the is located on the heater box next to the blowermotor, its held in with two screws and slides into heater box, lets see if i can send you a photo of the blower resistor to help you locate it.johnjohn2_107.jpg

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The heater/ac fan only works on speed settings 4 & 5

you might check your switch sounds like to me that your two lower speed sides of the switch maybe burnwed out.

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Heater fan only blows air in the highest "on" position

Well it sounds like the blower motor relay is out you might also need a blower motor if it is using to much juice on high speed then the blower motor is probabley about to go out and with the noise you are describing it sounds like a bearing in the blower motor is about to go out so probabley should change the blower motor and the blower motor relay.

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