Question about 2000 Pontiac Sunfire

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Blower motor does not work on first 2 lo speeds. Is there a diode for the switch or some other electrical problem.

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You need to change the blower resistor located behind the blower
motor under the glove compartment

Posted on Jan 01, 2011


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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 !
Air Speed
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:
• Low speed--3 resistors
• Medium 1 speed--2 resistors
• 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.

Blower Motor and Resistor Diagnostics by Wells

Jun 11, 2017 | Pontiac Cars & Trucks

1 Answer

Blower does not work and when it does it only works on high

Blower motor runs on three speeds lo med hi, the intsrument could be bad which switch the speeds.

Jan 11, 2013 | Dodge Dakota Cars & Trucks

1 Answer

01- Dodge Caravan AC Heater Control it only works on high none of the speeds work when I rotate the switch from low to high. Is this a swith problem or a motor problem?

Most likely neither. The most common cause is that an electrical device called the blower motor resister block, has failed. This device provides all the slower speeds. It is generally mounted in the HVAC [Heating, Ventilation & Air Conditioning] box, very close to the blower motor. FYI, we mechanics call the fan motor inside the cabin the blower motor. The electric fan motor behind the radiator is called the cooling fan motor.
If the resistor block is OK, then you have either a bad fan speed switch or a melted electrical connector at that switch. 95% of the time, the resister block is the problem.

Aug 22, 2011 | 2001 Dodge Grand Caravan

3 Answers

Heater only works on low setting

First, check all your fuses- if you find one that is blown, replace it with one that is the same rating- if it blows right away, there is a wiring problem that needs troubleshooting.

If all your fuses are OK.....

Find where the blower motor is- on most vehicles it is in the right knee area of the passenger side up front... sometimes it is on the passenger side under the hood. If you cannot find it, set the blower speed to low, turn on your key, but do not start the car (don't do this for more than a few minutes, because it can drain your battery). Follow the motor sound....

If the motor has only two wires going to it, the problem is probably with either the blower speed switch or the blower speed control relay. Sometimes, a 2 wire blower CAN wear out in a way that it will only run on low, but you can eliminate that possibility....

With a 2 wire blower, you can check the motor by running a set of jumper wires from a battery to the blower and see if it comes on full speed. First, connect a voltmeter across the connector so you know which side gets + and which gets -. If you are not comfortable with doing this yourself, by all means get a friend with experience or a mechanic to show you how.

If the motor has a bunch of wires going to it, the problem is probably the blower motor itself. These can be very expensive, and your best bet is to shop around online for one.

Jan 30, 2011 | 1990 Chevrolet K1500

2 Answers

Ok, my blower was not working at all. It used to work on the 2 and 3 setting. I replaced the resistor nothing. Took out blower and hooked it up to 12 volts it came on. So I went and bought a new control...

the blower motor is going. It's drawing too much current and taking out the resistor pack. It has a thermal limiter that melts when the resister gets too hot. Repalce motor and resistor.

Dec 10, 2010 | Ford Focus Cars & Trucks

3 Answers

The fan switch only works on level 5 out of 5... is this the selector switch?

You probably have a faulty blower motor resistor, this electronic part controls blower motor fan speed. This part is located near the blower motor, unhook the electrical connection and you will see 2 screws holding the part in place. This part looks like some type of circuit board, Good luck, Gary

Jul 27, 2010 | 2003 Chevrolet Impala

1 Answer

97-Buick LeSabre Psycho-blower

sounds like a bad ground. with the blower on, measure the voltage between ground on the battery and ground on the blower. it should be less than 0.1v. if more, repair the ground. if ok, it may be corrosion at the fusebox or the HVAC module its self

May 28, 2010 | 1997 Buick LeSabre

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