Question about 1991 Chevrolet S-10

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91 chevy s-10 blower works on high only

Blower works on high only--how to find and change blower resistor

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I BELIEVE THE RESISTOR IS LOCATED ON THE HEATER BOX UNDER THE HOOD, THERE WILL BE 2 BOLTS HOLDING IT ON... AND A WIRING HARNESS THAT PLUGS INTO IT... VERY EASY TO CHANGE.

Posted on Jun 18, 2009

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1 Answer

How do i fix a heater in a 91 jeep cherokee laredo?


fails on high, need this first.....@!!!!

if it fails on high then you hot wire the blower,

does the blower work with 12vdc applied to it, unpugged?

very old car.

use alldata.com to get the FSM data. and schematics.

got 12v below.

the switch bypasses the resistor block on high, so high is first

use a 10 buck DMM volt meter at walfart.

got 12v to the blower?

got 0v on that blower bottom pin?

if yes, the blower is dead

if not, then the fuse is blown, (use a voltmeter) or the switch left is bad. (or any wire bad end to end)

to check a fuse, check both sides key on, blower in, for 12vdc.

if once side is 0v, the Fuse is in fact bad. (acid test)





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Oct 03, 2014 | Jeep Cherokee Cars & Trucks

1 Answer

I have a 91 chevy s10 blazer and the heater/ac does not turn on at all, checked all fuses and changed blower motor....................NOTHING. My frustration level is mounting-help me please.


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Nov 24, 2013 | 1997 Chevrolet Blazer

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How to replace 1998 chevy s10 blower motor resistor


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1 Answer

Fan only works on high on 1995 Chevy K1500. I tried replacing the relay(?) behind the glovebox, but no change.


The blower motor resistor is the culprit.Usually is located near the blower motor.Generally an inexpensive repair.However it is possible that the blower motor may have caused the resistor to burn out.

May 26, 2010 | 1995 Chevrolet K1500

1 Answer

1997 Chevy S10 pickup Fan switch for heater runs on high only.


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2 Answers

1997 Chevy K1500 heater only works on high


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Why does blower fan speed switch lock-out off and low speed positions on 1998 chevy silverado? It stopped working altogether then I replaced a 10 amp fuse and now only medium high and high will work but,...


Sounds like you may have a bad blower motor resistor.  When they go bad, they usually wipe out all speeds except high.  But could knock out just one or two of the speeds.  It should be located near the blower motor.

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2 Answers

Blower motor will not turn off when car is off.


If it's only working on high setting it is usually the blower resistor that needs replacing. They are usually located under dash, passenger side, remove cover, and it should be bolted or screwed near blower motor itself. $10-$20 part

Mar 01, 2009 | 2005 Chevrolet Impala

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