Could someone please describe how to replace the blower fan/motor which blows the hot or cold air into the passenger area? I don't have a shop manual. My 99 SE was in a wreck before I bought it and the blower works but makes noise some of the time. It sounds like a bad bearing. Thanks.

 

Blower Motor - Noise
Classification:
HA99-004A

Reference:
NTB99-071A

Date:
February 10, 2000

NISSAN BLOWER MOTOR NOISE - COVER INSTALLATION

This amended version of NTB99-071 updates the services and Claims Information Sections. Please discard all paper copies of NTB99-071.

APPLIED VEHICLES:
1996-1999 Pathfinder (R50)
1995-1999 Maxima (A32)
2000 Maxima (A33) with Automatic Heater/Air Conditioner Controls

SERVICE INFORMATION:

If a customer indicates that a light ticking or humming noise can be heard coming from the blower motor of an applied vehicle when the motor is run at low fan speeds (speed 1 or 2), a new, noise reducing blower motor cover is available (see Figure 1). The noise, if it occurs, may be very slight and, at times, difficult to hear.

Use the Service Procedure in this bulletin to evaluate the noise and determine the next step to correct the condition.

NOTE: This is the ONLY approved repair procedure for this incident. A claim to Nissan for the repair of this incident may be denied if the repair is not performed exactly as outlined in this bulletin.

SERVICE PROCEDURE:
Run the blower motor at low fan speed (speed 1 or 2) and evaluate the noise, if any. Decide which of the two following categories the noise falls under:

1. Loud rattle, clatter, jolt, or flap: Go to the procedure for Blower Case Cleaning.

2. Light ticking or humming noise: Complete the steps below to Install Blower Motor Cover.

Install Blower Motor Cover:

NOTE: It is not necessary to remove the blower motor when installing the blower motor cover.

1. Remove the instrument panel lower cover (if equipped).

2. Disconnect the blower motor harness connector.

3. Clean the blower motor housing to ensure adhesive strips on the back of the blower motor cover will stick (standard window cleaner or other all-purpose cleaner can be used).

NOTE: Be sure to remove all residual film from the blower motor housing that may have been left by cleaning.

4. Peel the protective coverings from the adhesive strips on the blower motor cover (see Figure 1 for adhesive strip locations).

5. Install the blower motor cover onto the motor bracket (see Figure 2).

6. Re-connect the blower motor harness connector.

7. Re-attach the instrument panel lower cover (if equipped).

8. 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 blower motor unit from the blower case.

2. Remove all foreign material from the case.

3. Re-install the blower motor unit.

4. Run the blower motor at low fan speed (speed 1 or 2) and re-evaluate the noise:

A. If the noise is gone, no further action is needed.

B. If the noise is still a loud rattle, clatter, jolt, or flap, investigate other causes for the noise and repair as needed.

C. If the noise is a light ticking or humming, go to and complete the Install Blower Motor Cover procedure.

 

Max 808,
Thanks for the good information. The noise my blower motor is making seems to be intermittent at all blower speeds. Sometimes there is no sound when the blower is running and sometimes it gets noisy. Once it is noisy I can go from speed 1,2,3, or 4, and the noise continues. Then, all of a sudden, it stops.
Sounds like there may be something in the case. I'll try to get it checked out.
Ken

 

The blower problem was a simple fix. I removed the glove box and disconnected the glove box light and the glove box light switch. Also removed the metal strip along the front brace. After removing the screws for the blower cover and the blower, I was able to get enough clearance to remove the blower. The squirrel cage had plastic pieces of the cover of a soft drink like you get at McDonalds!! I removed the torn up plastic from the cover and reinstalled everything. No more noise.
Ken

 

Congratulations. I did the same, but i couldn't get enough clearance to get the motor out. Mines still making a humming noise. I'll try it again in the next few days.

 

Max 808,
It is a tight fit but if you remove the cover (3 screws I think)while the motor is still on, then you can remove the screws holding the motor and squirrel cage. Removal of that metal strip along where the bottom edge of glove box goes is the secret. Removal of the metal strip will allow you to bend the remaining plastic slightly and get the blower unit out. If you don't see anything causing the noise your blower motor bearings might be going bad (you can run the blower when it is not installed by just leaving the connection on and running your heater controls. Good luck.
Ken

 

Thanks for the tip! I'll most likely try removing the cover and motor this week.