TEST 2: Applying Power And Ground To The Blower Motor
For our last test we're gonna' apply 12 Volts and Ground from the battery of your 3.0L Nissan Pathfinder (D21 or Pick Up).
The purpose of this test is to see if the blower motor will run and run without any bearing noise.
There's a good chance that you may have to remove the blower motor from its location to access the blower motor's male spade terminals.
IMPORTANT: If the blower motor runs in your 3.0L Nissan Pathfinder (D21 or Pick Up), but it did not pass TEST 1, you can conclude that it is defective and needs to be replaced.
Let's get started:
Disconnect the blower motor from its electrical connector.
The connector has 2 wires. The blu (BLU) wire supplies 12 Volts and the blue with white stripe (BLU/WHT) wire supplies Ground (via the blower switch).
NOTE: On the 1995 3.0L Nissan Pathfinder and Pick Up the wire that supplies 12 Volts is the blue with red stripe (BLU/RED) wire of the connector.
Apply battery power to the blower motor using a jumper wire.
You'll be applying power to the male spade terminal (of the blower motor itself) that connects to the BLU 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 BLU/WHT 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.
You can conclude that the blower motor is not defective (and DOES NOT need to be replaced) if it passed the amperage draw test in TEST 1.
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 resistor 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 isn't an expensive part on the 1990-1995 3.0L Nissan Pathfinder (D21 or Pick Up). The following links will help you comparison shop and save a few bucks on its purchase:
More 3.0L V6 Nissan Tutorials
You can find a complete list of tutorials in this index: Nissan 3.0L Index of Articles.
Here's a small sample of the 3.0L Nissan tutorials you'll find in the index:
- How To Test Engine Compression (3.0L Nissan).
- Mass Air Flow (MAF) Sensor Test 3.0L Nissan Quest (1993, 1994, 1995).
- Mass Air Flow (MAF) Sensor Test 3.0L Nissan Maxima (1995-1999).
- How To Test The Starter Motor (Nissan 3.0L, 3.3L) (at: troubleshootmyvehicle.com).
- How To Test Engine Compression (Nissan 3.0L, 3.3L, 3.5L) (at: troubleshootmyvehicle.com).
If this info really saved the day, buy me a beer!