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Re: removal of heater fan switch on dash.
Chances are it is in fact not the switch. These systems are wired so that at high speed setting battery power is connected directly to the fan. However lower settings switches through a set of resistors. These are mounted on a circuit board which in your case is mounted on the firewall on the passenger side of the vehicle under the wiper. Check this before you turn the control panel into a heap of spares on the garage floor.
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There could be a number of reasons. Fan is bad, fan area in box is so clogged it doesn't allow fan to spin, a bad switch at instrument panel, a bad resistor, bad connections. I would start by removing the fan. I believe you will have to go in behind the glove box. Remove the fan and check to see if it works, it may be fine if bad replace. Check inside of box for leaves and any other kind of clutter that may be preventing fan from spinning. Check wires to fan for mouse damage. Mice can take there toll on a cars wiring. If all is well so far check the switch in your dash. Switches are funny, some last a life time some don't. I believe you will find your problem, following these steps. GOOD LUCK FRIEND.
more then likely its the fan resistor doing this. a fan resistor has different diodes or coils for each setting on fan motor. from low to high. it is under dash on passengers side. you have to remove cover held on by retaining clips, the resistor is mounted under the dash by 2 bolts. it has 2 wires going to it. the best place to buy one is at a local auto parts store. for the dealer will rip you off, big time. good-day !
You need to replace your fan switch, This is located in you dash compartment, You have to remove the dash and unplug the switch that is pluged into the lever that changes the speed, You may be able to spray some wd/40 in the connections and it may just need connections cleaned, bes of luck to you.
many of the heater blowers use a resistor type switch to adjust the fan speeds, when the switch goes bad only the high speed will work. the resistor is usually located in the airflow in the heater box under the dash. find it , change it (it just plugs in) and it will work again
I would venture to say that if you hit the dash and the motor started running then the problem would be in the heater control assembly mounted in the dash, like bad wire to Heater switch connection. A bad connection can jenerate a lot of heat and start melting things unless you find the problem soon enough. The switch may already be damaged inspect switches and wireing for any vissible damage and replace as required. However if everything looks ok with the heater control assembly, Their are a few more things you can check to be sure of before relpacing the heater blower motor. Turn the heater controles to the high heat and fan on high as well, settings and remove the heater blower motor pig tail and check to see if power is getting to the motor,( use a 12 volt test light at the wire harness side of this connection ) also check for power going to and leaving the blower motor resistor assembly ( mounted to the side or top of the blower motor housing ). If so equipped. If you find no power getting to the motor at this point then you will half to start working your way back through the wireing towords the heater controles until you find the problem. Using your test light. Now if you did have power going to the motor then replace the motor. Good Luck From Ernie @ RedDeer, Alberta, Canada.
it most likely is the blower motor resistor
the control head controls the high fan setting while the resistor controls all other speeds-first check the wiring harness-it is located under the passenger dash and it easily damaged by passengers kicking it with their feet
Your blower motor resistor has gone bad, it should be located next to your blower motor in the car, held in place with a couple of screws, remove it and replace it. The resistor is responsible for making the blower motor run at slower speeds than high or (4). Let me know if this helps.