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Why does the heater fan run on low and medium but not on high?

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Replace the resistor that controls speed usually on firewall close to the blower motor

Posted on May 01, 2015

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2 Answers

How do I fix heater fan to operate at low and medium speeds. It only works on High.


depending on car some have a fan relay or its your switch itself

Jan 13, 2016 | Cars & Trucks

1 Answer

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

1 Answer

Why wont the heater switch work on a


Did you progressively lose fan settings? (works on high but not medium or low?) The fan switch is mounted behind the fan knob and fails quite often.

Aug 27, 2014 | 1997 Chevrolet Blazer

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Why does heat-air fan only work on high


Can you tell that the fan is getting higher or lower? Or is there no response from the fan control until you get to the high position?

Jun 24, 2014 | 2001 Chrysler Town & Country

1 Answer

1992 chevy C1500: Heat works on low speed, no medium, and high only works intermittantly.


On any other vehicle it sounds like the blower fan switch.
The fan switch provides power or ground to the resistor and there would be a high speed blower relay to bypass the resistor.
But in your case the fan switch is part of the controller.
I don't have a diagram for a 92 but the 94 model shows relays for low medium and high speeds. Each relay gets power from a fuseable link. The high relay gets power thru the low relay if the low relay is not engaged.
If you have the model with 3 relays you may need to check them.

Feb 01, 2013 | 1992 Chevrolet C1500

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

Apr 06, 2010 | 1998 Ford Ranger SuperCab

1 Answer

Heater fan only works on "high speed"


All cars are designed with a blower fan motor that pushes air through the ventilation system. This air is processed by a series of vents to direct the air to various positions. Example: heater, air conditioner and defrost modes. Most blower motors are power by a basic electrical circuit that utilizes a multi resistor or a solid-state resistor to control different fan speed modes (low, medium low, medium and high). If the resistor malfunctions it may lose one or more of the lower fan speed settings.
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Mar 02, 2010 | 1999 Buick Century

1 Answer

2004 chevy heater fan works on low and medium speed but not on high speed


There are two relays for the heater control fan,a low blower relay and a high blower relay.It sounds like the hi blower relay is bad.

Dec 12, 2009 | 2001 GMC Jimmy

2 Answers

No ac / fan only works on high


replace the AC blower motor speed control resistor, it is burned out

Jun 30, 2009 | 1993 Dodge Caravan

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