A/C - Extreme Temperature Difference in Bi-Level Mode

Bulletin No.:
T-93-45

File in Group:
1

Number:
92

Corp.Ref.No.:
231210R

Date:
Jan. 1993



SUBJECT:
EXTREME TEMPERATURE DIFFERENCE IN BI-LEVEL MODE

MODELS AFFECTED:
1993 FLEETWOODS (RWD)


Temperature difference between instrument panel vents and heater ducts (bi-level mode) can vary by 50-60~ F.

The heater shut off air door is not in the correct stop position preventing the proper mix of air.

This condition may be repaired by installing a screw as a stop in the inner case wall; the heater shut off door will park in the correct position, allowing a better mixture air.

The repair procedure is as follows:





1. Remove A/C module lower evaporator case per Service Information Manual, Section 1B. Front screw may be hidden by carpet and difficult to access. Use of a 7 mm flex head socket may be helpful. Refer to Figure 1 for attaching points.

2. Remove/disconnect heater core per Service Information Manual, Section 1B.

3. Disconnect vacuum harness gang plug connector at rear of module. Apply vacuum to the gray vacuum line on the female gang connector to actuate the heater the closed position.








4. Using a 90~ drill motor and the included template (Figure 2) locate and drain a 5/32" (4.0 mm) hole into the inner case wall. Refer to Figure 3.

5. Install screw, P/N 11505332, into hole. Screw must not be stripped and must seat flat against case wall.

NOTE:
This particular part number must be used for this repair as these dimensions are critic.

6. Remove vacuum from shutoff door and verify that door will not travel past screw or become hung up.

7. Connect vacuum gang plugs. Install push pin into module boss.

8. Install/connect heater core.

9. Install/connect A/C module lower evaporator case.

Parts are currently available from GMSPO.

For warranty purposes use Labor Operation T1894 at 1.2 hours.