The Cavalier blower motor resistor is part of your Chevy climate control system. Made up of various resistors this part helps control and modulate the voltage to your blower motor. As you adjust the fan speed to your blower motor, the Cavalier blower motor resistor is what makes the different speeds possible. Over time this resistor may burn out, leading to your Cavalier stuck on one fan speed or not blowing air through your vents at all.
Today I’ll be showing you how to test your Cavalier blower motor resistor in a 1994 Chevy with a 2.2 liter engine in it. If your Cavalier blower or air conditioning does not work, you should start testing this part first.
As you turn on your Chevy climate control, the voltage going to your blower motor is adjusted through these resistors. The switch of your climate control routes the power through the right combination of resistors. This is done to achieve the right rate of speed that your blower motor operates at.
The Cavalier blower motor resistor is located behind the dashboard of your Chevy. It’s mounted to the air conditioning and heater control panel and leads to your blower motor. It’s connected by a four pin wiring connector, and you’ll be using a digital multimeter to test the function of this part.
Testing your Chevy Cavalier Blower Motor Resistor
In order to test the operation of your blower motor resistor, you’ll be measuring the function by reading the internal resistance. Because the voltage passing through the resistor is adjusted and lowered to make your Chevy vents blow less than full speed or H1. By referencing our Cavalier blower motor resistor wiring diagram below, you’ll use your multimeter to test the resistor.
Undo the two bolts holding in your blower motor resistor. Remove the unit and check for any burns or signs of damage to the resistor coils.
If you notice any damage to the coils or resistors, you’ll need to remove and replace the unit with a new resistor.
Turn the dial of your digital multimeter to read resistance Ω and you’ll be testing combinations of the pins on your resistor.
Disconnect the wiring harness that leads to your resistor, and you can begin testing. The first pair of pins you are checking for is PIN 1 and PIN 4. There should be continuity at these two pins.
The next pair to check is terminals 3 and 1, where you should also have continuity. The next pair of pins to check is PIN 2 and PIN 1. These tests should return continuity, and if you see any open loop conditions or errors between these pins, you’ll need to remove the Cavalier blower motor resistor and install a replacement part.
If your blower does not work, or your Cavalier vents do not blow air, you can use our Cavalier climate control wiring schematic to test for power. The wire at the harness is checking is PIN 1 which is a BLUE wire. This wire that goes to PIN 1 is the current output to Blower Relay.
You can test the variable speed of your climate control by reconnecting the blower motor resistor and measure the pins in question. To do this you’ll need to pierce the wires in question with your digital multimeter.
Test the wire at PIN 2 which is a light BLUE wire, which is the speed input from the blower switch. This is also known as M2 or the second speed of your blower motor. Turn your Cavalier climate control to the M2 speed, and check this wire for a signal. Now turn the speed down to M1, and test PIN 3 which is a TAN wire. Repeat this test to check for voltage.
The last wire is the one that leads to PIN 4, which is a YELLOW wire. This is the speed Input From Blower Switch and Vent Selection Switch. If this climate control switch is not responding in the right way, you’ll need to replace it.
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