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My car aircon doesnt work at low or medium speed.

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  • 190 Answers

REPLACE FAN RESISTOR

Posted on Nov 06, 2012

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Posted on Jan 02, 2017

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SOURCE: why does blower fan speed switch lock-out off and

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.

Posted on Sep 10, 2009

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SOURCE: 2001 Dodge Caravan heater fan not working on low or medium speeds

Hi ,The resistor is in the heater box located under the dash on the passenger side.It can be seen when you crawl under the dash and look up. It has two or three bolts on it. It will also have a plug connected to it, which has to be disconected.

Posted on Feb 11, 2009

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SOURCE: I have high speed blower but no medium or low

It's likely a relay. I've often seen where the lower settings are ran through one relay and the higher setting ran through another because of the difference in amperage. I'd start there, the relays are often pretty cheap and a lot easier to replace than tearing the dash apart to change the switch.

Posted on Oct 09, 2009

  • 198 Answers

SOURCE: 2004 chevy heater fan works on low and medium

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.

Posted on Dec 12, 2009

  • 189 Answers

SOURCE: car aircon doesnt work

sounds like the blower motor resistor is bad. Just a guess

Posted on Apr 21, 2010

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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

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

Car aircon doesnt work


sounds like the blower motor resistor is bad. Just a guess

Apr 20, 2010 | 2007 Toyota Camry

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

I have high speed blower but no medium or low


It's likely a relay. I've often seen where the lower settings are ran through one relay and the higher setting ran through another because of the difference in amperage. I'd start there, the relays are often pretty cheap and a lot easier to replace than tearing the dash apart to change the switch.

Oct 09, 2009 | 2003 Ford Taurus

2 Answers

Cooling fans don't work at all


that is because your fan relays have burned out and need to be replaced. do not I repeat do not drive your car until you fix this problem because your engine will overheat and you will crack your engine block and it will seize on you. Most like you have a 2 speed fan which is ahigh speed and a low speed.

Jul 26, 2009 | 2002 Audi A4

1 Answer

Aircon is not working properly if i speed up up 100kph.


The evaporator is freezing up. Check to make sure it's not low on freon.

Feb 27, 2009 | 1990 Mitsubishi Galant

2 Answers

Does ac blower have a fan relay ? It doent blow ******* max


if it doesnt work on all speed its the blower motor resistor that broken thanks pierre

Jul 30, 2008 | 1979 Pontiac Firebird

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