Tech Tip: Curing Nissan Blower Motor Noise

Tech Tip: Curing Nissan Blower Motor Noise

If a customer indicates that a light ticking or humming noise can be heard coming from the blower motor (see affected vehicles) when the motor is run at low fan speeds (speed 1 or 2), a noise-reducing blower motor is available. The noise may be very slight and, at times, difficult to hear.

If a customer indicates that a light ticking or humming noise can be heard coming from the blower motor (see affected vehicles) when the motor is run at low fan speeds (speed 1 or 2), a noise-reducing blower motor is available. The noise may be very slight and, at times, difficult to hear.

Affected Vehicles:
• 1996-2001 Pathfinder (R50);
• 1995-’99 Maxima (A32);
• 2000-’01 Maxima (A33) with automatic heater/air conditioner controls.

Service Procedure:
1. Run the blower motor at low fan speed (speed 1 or 2) and evaluate the noise. Decide which category the noise falls under:

  • Loud rattle, clatter, jolt or flap: go to the procedure for blower case cleaning.
  • Light ticking or humming noise: complete the following steps to install a new blower motor cover.

2. Remove the instrument panel lower cover (if equipped).
3. Disconnect the blower motor harness connector.
4. Clean the blower motor housing to ensure adhesive strips on the back of the blower motor cover will stick (standard window cleaner can be used).
Note: Be sure to remove all residual film from the blower motor housing that may have been left by cleaning.
5. Peel the protective coverings from the adhesive strips on the blower motor cover. See Fig. 1.
6. Install the blower motor cover onto the motor bracket. See Fig. 2.
7. Reconnect the blower motor harness connector.
8. Reattach the instrument panel lower cover (if equipped).
9. Run the blower motor at low fan speed. Confirm that the blower motor is working properly and the noise is eliminated or reduced to an acceptable level.

Blower Case Cleaning:
1. Remove the blower motor unit from the blower case.
2. Remove all foreign material from the case.
3. Reinstall the blower motor unit.

Technical service bulletin courtesy of Mitchell 1.

For more information on Mitchell 1 products and services, automotive professionals can log onto the company’s website at www.mitchell1.com.

You May Also Like

Were things better when they were simpler? Probably not.  

Last month, Andrew Markel purchased a 1982 Chrysler New Yorker for $1,500.

1982 Chrysler New Yorker

Last month, I purchased a 1982 Chrysler New Yorker for $1,500. The car was previously owned by a technician who was moving to Arizona. It had 67,000 original miles. It would be my “beater with a heater” for this winter.

Under the hood is a 318 V8 with a Lean Burn feedback carburetor with a rudimentary engine control module attached to the air cleaner. The system could adjust the spark advance, change metering in the carburetor and even open a solenoid to vent the evaporative emissions from the fuel tank.

Branford Public Schools Award $60M Transportation Contract to Zum

Within five years, Zum will transition Branford to a 100% electric school bus fleet, the first in Connecticut.

Tesla Model 3 TPMS Service

Resetting and programming TPMS sensors for a Tesla is a lot like any other vehicle, and the challenge is still the same: keeping the light off.

Can You Jumpstart an EV?

First thing’s first: Find the LV battery, which could be anywhere in the vehicle.

ADAS Module Programming

Reflashing and reprogramming is a necessary service for repairing vehicles.

Other Posts

Mullen Road Tests Solid-State Polymer Battery Pack

The results met or exceeded all requirements targeted for the first drive cycles for energy usage and driving range.

Understanding What Antifreeze/Coolant Actually Does

Today, each manufacturer has its own formula for best results in their vehicles. This video is part of the Group Training Academy.

How The Vehicle Cooling System Functions

Here’s what to know to clarify cooling questions you’re asked at the service counter. This video is part of The Group Training Academy.

Oil Filter Housing Weak Points & Standard® Solutions

Engineers at Standard® have created a completely assembled Oil Filter Housing Kit.