TEST 2: Applying Power And Ground To The Blower Motor
In this test section we're gonna' apply battery power and battery ground directly to the blower motor.
If the blower motor is functioning correctly, then applying battery power and Ground to it will cause it to run.
If the blower motor is defective, then applying battery power and Ground to it will not make it run or it'll run but with a lot of bearing noise.
Let's get started:
Disconnect the blower motor from its electrical connector.
The connector has 2 wires. The dark blue with light green (DK BLU/LT GRN) wire supplies power and the orange with black (ORG/BLK) wire supplies Ground (via the blower switch/blower resistor).
Apply battery power to the blower motor.
You'll be applying power to the male spade terminal (of the blower motor itself) that connects to the DK BLU/LT GRN wire of the electrical connector.
Apply chassis Ground to the blower motor.
You'll be applying Ground to the male spade terminal (of the blower motor itself) that connects to the ORG/BLK wire of the electrical connector.
The blower motor should run.
Let's take a look at your test results:
CASE 1: The blower motor ran and ran without any bearing noise. This is the correct test result and tells you that your Ford Mustang's blower motor is not defective.
CASE 2: The blower motor ran with a lot of bearing noise. This test result tells you that the blower motor is defective and needs to be replaced.
Worn out bearings will cause the blower motor to use more current. This excess amperage draw will cause the blower resitor and/or the blower switch to burn out.
CASE 3: The blower motor did not run. This test result tells you that the blower motor is defective and needs to be replaced.
Where To Buy The Blower Motor
The blower motor on the 1996-2000 Ford Mustang isn't an expensive part. The following links will help you comparison shop and save a few bucks:
More 3.8L Ford Mustang Tutorials
You can find a complete list of 3.8L Ford Mustang tutorials in this index:
Here's a small sample of the tutorials you'll find in the index:
- How To Test The Fuel Injectors (1994-1995 3.8L Ford Mustang).
- Constant Control Relay Module (CCRM) Circuits (1996-1997 3.8L Ford Mustang).
- How To Test The TPS With A Multimeter (1994-1995 3.8L Mustang).
If this info really saved the day, buy me a beer!