Question about 1989 Toyota Pickup SR5

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My heater fan switch in my operates only on high speed.

I have a 1989 Toyota pickup and I'm told I need to replace the rheostat. Is this a fairly simple project or do I need to tear apart the whole dashboard? I also need to replace the bulb that lights up the heater controls. Thanks.

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  • Yotie1 Mar 03, 2009

    same problem only mine operates in low. resistor is good. How hard is it to replace the switch?

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  • 4,669 Answers

The Blower resistor needs replaced.

Posted on Feb 27, 2009

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1 Answer

Ac/heater will only work on low when you move it to med or high it shuts off


need to check switch,resistor and fan ---ur switch might have resistor built in it would need to be tested for continuity for the other speeds --if your truck [didnt specify which ] has a separate resistor it should be attached to the heater fan motor housing again resistor needs to be tested -also test ur fan for any resistance or overheating

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Fan speed will only work on high,is the switch the problem


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Don't go there just yet ! Most heater motor speed problems relate to the heater resistor ! It's located in the ducting close to the motor assy and usually has 4/5 wires on to it and a 2 screw fixing. This componant must be cooled (hence air duct location) and is solely responsible for motor speeds ! You can check motor fan by test lamp/meter ! Good Luck

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I have a 1989 Toyota 2wd pickup. I have replaced the resistor and now all four fans speeds work like they should. But now, sometimes fan motor just stops. If I turn the swith off then on it will start...


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this is not a problem with thw switch or motor. There is a resistor that is mounted inside the dash on the pasenger side that controls the speed of the blwer..these have a tendency to burn up after 10 years or so... replace the resistor, and you will be fine!  http://cgi.ebay.com/ebaymotors/Toyota-Truck-A-C-Heater-Fan-Resistor_W0QQcmdZViewItemQQcategoryZ33548QQihZ016QQitemZ260344846266QQrdZ1QQsspagenameZWDVW#ht_500wt_1230

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