Question about 2002 Chevrolet TrailBlazer

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Heater control fan only works on speed 5. Removed heater control, what does the resistor look like? I'm asuming it's not a regular electronic resistor right?

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Your looking for the blower resistor. Its on the passenger side under the dash. Two of the wires go the the blower motor. The wire connector and the resistor can burn or corrode. The replacement is easy two screws hold the resistor in and the connector can be replace with **** connectors.

Posted on Dec 12, 2009

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Fan speed 5 doesnt work for trailblazer 2007 ls

Posted on Feb 03, 2010

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2 Answers

Mini one - air vents only work when it is on full, so you have to get blasted with air or nothing at all. Any ideas?


Please check for a blower resistor problem. The fan speed is controlled by a resistor which controls blower speeds. The resistor works the lower speeds while usually high speed bypasses the resistor for full fan speed only. You either have a resistor or resistor electronic module. Google location for locaton of resistor. ( mini one blower resistor location) There is alot of info that may help you.

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The heater fan on my 1993 f-350 has become really loud. I only have hi speed which I understand may be a resistor issue but how do I remove the fan and motor assembly to inspect it?


A heater blower motor resistor is an electronic device with three or more progressive resistors that allow the heater blower motor to operate at slower speeds. The highest speed of the heater blower motor is not controlled by the resistor, so when the resistor fails, the fan will often work on the highest speed setting, but not the lower speeds.
To resistor is generally located under the dashboard and under the hood, near the blower motor . The resistor's electrical connector is disconnected, the resistor is removed and the new resistor is installed. On some vehicles it may be easily accessible, and on others it may take partial dashboard removal to replace the resistor.
Look under the hood, generally the wiring for the Blower resistor is attached to the wiring to the blower motor itself
It's inboard & below the motor, near the accumulator. You can see it standing beside the passenger fender. it's the off-white connector behind the L heater hose above the vacuum reservoir & the white WARNING sticker

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this is a smiple repair, replace the blower motor resistor, this is what controls the lower speeds and is very common,the resistor is locate in the heater box next to the blower motor.

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1 Answer

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Your fan technically only has one speed. The voltage is decreased by the use of a resistor pack to produce the slower fan speeds. If this resistor pack burns out, it will leave you with only the high setting. You can find the resistor pack located under the hood, on the passenger side on top of the fan housing.

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The fan speed control module is no good. There are two types of fan control. The rheostat kind which is more common on older cars. It is made up of series of resistors to bring down current for diffrent speeds, and uses nichrome wire. The other kind uses an alectronic circuit that has one large transistor, and works very similar to the speed control on a rechargable drill except the fan is speed set instead of variable continously like a rechargable drill. I have worked on one of these electronic fan speed control, and noticed that it has a thermal fuse in it for safety. The thermal fuse looks almost like resistor on the one I had fixed, and it is solder onto the circuit board. I replaced it with a regular thermal fuse of the same rating and saved the customer over a hundred dollars on a new electronic module. Good luck.

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It is under the right side of the dash. Blower resistor and relay.

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SOUNDS LIKE YOU HAVE A PROBLEM WITH THE SPEED RESISTOR. VERY COMMON PROBLEM ON EUROPEAN VARS. NORMALLY THIS RESSISTOR IS BEHINF GLOVE BOX IN THE HEATER/A-C BOX..

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1 Answer

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coolant flows thru heater core all the time temp is controlled by doors.you have a blockage in core,try removing hoses and backflushing heater core probably a little bit of scale stopping inlet.the fan speed is probably the blower resistor it is locateed next to blower motor under dash check the plug they burn up

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1 Answer

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It's usually caused by a faulty fan speed control resistor. If you can follow the wires from your switch, they usually connect to this resistor and in turn the resistor is connected to the fan. I found my fan control resistor on my GM car inside the fan cavity. I removed the fan and located it inside the housing. This resistor gets very hot so it is placed close to the fan to cool it. Good luck.

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