Electric Vacuum Pump - Noise/Steering Wheel Vibration

Bulletin No. T 86-59A
File in Group 6E
Number 29
Corp. Ref. No. 616801
Date June '86
SUBJECT: ELECTRIC VACUUM PUMP NOISE AND VIBRATION

MODELS AFFECTED: 1985-86 FWD DE VILLES AND FLEETWOODS 1986 ELDORADOS AND SEVILLES

This Bulletin supersedes Bulletin T-86-59 which should be destroyed.

Some 1985-86 De Villes and Fleetwoods and 1986 Eldorados and Sevilles may experience a moan or buzzing noise accompanied by vibrations in the steering wheel, instrument panel, and floor pan. A second design vacuum pump and mounting bracket is installed after VIN number 281300 for 1986 FWD De Villes/Fleetwoods, 607957 for 1986 Eldorados, and 805741 for 1986 Sevilles, to provide additional vacuum pump isolation. The redesigned mounting system prevents the second design pumps from being interchangeable directly with the first. Since the first design pumps have been superseded by the second generation pump, it is necessary to install a new mounting bracket when replacing first design pumps. The second design part numbers are listed below.

Part Number Description Usage

22062562 Vacuum Pump C,E,K
25527649 Bracket C
1633916 Bracket E, K
22055187 Grommets C, E, K

FIGURE 1 - VACUUM PUMP:

IMPORTANT: Make sure grommets are installed in the correct orientation as shown in Figure 1.
IMPORTANT: The grommet and bracket screw holes must align properly to prevent cocking of the vacuum pump mounting screw, which will cause vacuum pump noise and vibration to ground through the grommet to the rest of the car.

IMPORTANT: After installing the new pump and bracket make sure the vacuum lines and wiring are not grounding out on the body or splash shield.
For warranty purposes use labor operation J0240 for .3 hours for De Villes/Fleetwoods and .4 hours for Eldorados/Sevilles.