Question about 2000 Ford Mustang

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My blower motor on my car won't run when put on low or medium speed only on high what is wrong with it?

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The blower motor resister module is bad,even if the blower motor sounds good,it is the cause of the resister failing,the blower motor is drawing too many amps.So change it also,the resister is located near the blower motor,and is mounted on the blower box,but actually goes inside the blower box to keep it cool.If this was at all helpful,please rate thank you.

Posted on Aug 04, 2010



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What is an AC diode fuse? I have a 2006 AWD Pontiac Torrent the AC/Heat doesn't work, I've changed all fuses for the HAVAC and still no AC/Heat blowing out of vents. What could be the problem?

Could be a number of thing's ! Testing the electrical circuit is the way to find out what's wrong . Using a wiring diagram and a DVOM - digital volt ohm meter . Videos on youtube showing how to test it ! Without testing i would only be guessing . Does it work in high speed ? In high speed it by-passes the resistor . If it doesn't work in any speed more then likely the blower motor is the problem !
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The HVAC control assembly applies ground to the blower motor control circuit that corresponds to the selected blower speed. The resistors and the blower motor are in a series circuit. The following list represents the number of resistors in series with the blower motor per particular speed request:
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• Medium 2 speed--1 resistor
When the operator requests High speed, the HVAC control assembly applies ground directly to the blower motor through the high blower motor control circuit. The resistor card has a fusible link which, if blown, will require that the card be replaced.

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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.

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My A/C doesn't work on 1, 2, or 3. It only works when the selector switch is set to high. Any ideas?

There's 2 relays that control the blower motor, one runs low and medium speeds and the other runs the high speed. Replace the relay for the low and med speeds.

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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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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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HVAC blower don't run at medium speed

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1993 f 150, the blower motor for the heat does not have high, only low and med

These motors use three separate sets of blower motor windings which Low, Medium, and High. The chances are that the selector switch is ok and the High winding or set on the blower motor is not good.

I do not know the color coding of the motor to be able to put 12 volts on one of the windings of the motor to try and force the high to make sure it is actually getting to the motor.

The only way to be certain is to get to the Speed Selector switch and try and find out if 12 volts is being selected to the high side of the switch that goes to the motor. You will have to take the dash apart, which is easier prob. better than replacing the motor which is in the firewall. You might be able to replace it from the engine compartment at a autowrecker, but the high may be a problem Chevy had.
So if you figure out the color of the wire that is the 12 V high, then with the car on and in the high position, apply 12 directly at the motor by exposing part of the wire with a razor blade or a poke through with a sharp tool just to see if it comes on.
Temp solution - Assume the motor is good and the switch may be bad, Remove the medium speed wire and swap it with the High wire and see if it runs on high. Then you will have Low and High ONLY.

There is allot there good luck!


Mar 02, 2009 | 1993 Ford F150 SuperCab

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