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A/c and heater fan only runs on high? - Suburban 1500 Chevrolet Cars & Trucks

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Replace resistor pack. Need your year/make/model to get you instructions.

Posted on Sep 04, 2010

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3 speed fan barely changes speed


You are talking about your blower fan for the air conditioner and heater right? More information will be needed to solve the problem.

When you say it barely changes speeds, does that mean it doesnt speed up, or doesnt slow down? By that I mean, is it "stuck" on low, or high?

Most blower fans run at different speeds through the use of a multi-stage resistor built into the fan switch circuit. Low speed is a high value resistor, medium speed is a low value one, and high speed is the fan running without any resistance.

If your fan is running on high and doesnt seem to want to run on lower speeds, the resistor pack may be failing. If the fan is running on low speed only, it may be that the fan itself is beginning to fail, or that the lubricant in it has gotten gummy.

Dec 07, 2015 | Cars & Trucks

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The controles for the heater or a/c do not work. blower fan runs on high all the time


if the problem is the fan only runs on high no matter were the fan control switch is then this sounds like the blower motor resistor is the problem.

Jun 22, 2011 | 1989 Chevrolet Corvette

1 Answer

Why does my heater in my 2000 ford ranger only work on the high setting?


I assume that you are talking about the heater fan?

Your heater FAN has at least 3 settings, and for our purposes we will assume low,med and high

Low and medium run through a resistor High is wired direct
Either your resistor is bad or your fan is
I know it seems wrong that the fan could be shot but it could be pulling so many amps that it won't work in any other mode than high
I just had this happen on one of my trucks
Start with the fan

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1 Answer

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


replace the blower motor resistor located on the heater box were the blower motor is located the wiring to the blower may go to it. This is very easy to locate if you buy the part first.

Jan 06, 2010 | 1997 Chevrolet S-10 Pickup

3 Answers

Heater motor only wokks on high


probley the restor that gives the a/c heater fan motor its power for the low/ medeam speds has gone bad and onley letes it run on high speed because it gives the fan motor full battery voltage on high speed. it should be located in the heater box were the fan will blow air across it to cool it when it is in use GEORGE STIRBER DBA AUTO ENGINEERING

Jan 01, 2010 | 2001 Nissan Xterra

1 Answer

Heater fan only works on high after replacement of heater core


It's very possible the fan motor has quit. The squealing noise is caused from motor bearing failure. As the bearings wear out or dry up the motor is harder to turn and require more current to run the motor. On lower speeds, the motor runs off a series of resistors that reduce the amount of voltage and current so the fan runs a lower speeds. If the bearings are worn, there is not enough voltage or current to turn the motor and that's probably the humming noise your hearing.
Good observation by the way.
Let me know.
regards,

Feb 13, 2009 | 2001 Chevrolet Prizm

1 Answer

Heater fan continues to run when heating system turned off.


Your Heater Power control module is bad I just had the same problem you can find it right behind the glove box it is mounted in the heater duct very easy to fix 2 screws and it is out and cost is about 150.00 at the dealer it is a dealer only part.

Dec 29, 2008 | 1996 Chrysler Town & Country

1 Answer

1989 ford f350 a/c heater fan only runs on high, replaced switch ,didn,t help. thanks geo


When your heater only works on high it is usually
the resistor unit in the heater passage housing. Look for wires ( about 4or 5 wires ) attached to the
plastic heater housing under the dash. It should
have a screw or two holding it to the housing. Pull
it out and you will see several wire coils. If they are melted or broken then thats the problem. On any switch position except high the power goes through these resistors to slow the fan down. Good luck. Neil W.

Dec 08, 2008 | 1989 Ford F 350

2 Answers

Heater fan motor wont run on high


Check or have checked the blower motor resistor. This is usually how they act.

Oct 25, 2008 | 1995 Oldsmobile 88

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