Dealer Technical Bulletin 68-T-4 – 1968 Pontiac – A/C Blower Motors Hitting Case

Reports of blower motor impellers hitting the evaporator case have been received. This condition usually occurs at low blower speeds and/or with brake application.

If the noise is encountered, install washer 3004686 [F] (Gp. No. 9.216) between motor and impeller. Forward all orders for the washer to Pontiac Factory Warehouse.

NOTE: The blower motor removal procedure shown in the 1968 Service Manual has been revised. The new procedure below should be followed when installing the clip.

Removal procedure:

1. Remove blower motor and impeller assembly as follows:
   1. Remove rocker molding.
   2. Remove antenna base.
   3. Remove bolts retaining hood hinge to fender and support hood.
   4. Remove wheel opening moldings.
   5. Remove bolts on right side of valance.
   6. On Grand Prix and Bonneville models, loosen bumper cam bolts and tilt bumper forward.
   7. Remove fender retaining bolts, noting placement of shims.
   8. Tape rear edge of fender to avoid paint scratches and remove fender.
   9. Remove blower motor retaining screws and disconnect wires.
   10. Remove impeller-to-motor retaining nut and separate.
2. Place clip 3004686 between motor and impeller with flange on clip pointing towards impeller (thickness of clip moves impeller rearward to clear case).
3. Replace impeller and retaining nut.
4. Replace motor and remaining parts by reversing removal procedure.

Flat rate time:

Flat Rate Operation

Operation Number	Time
013-255-00	1.4 hr.

This is a transcription of the original dealer bulletin for easier reading and search. The complete original scan is shown below.