REDUCED HEATER SYS. PERFORM. NEW HEATER OUTLET DUCT/PROCED.

MODELS AFFECTED: 1988 - 1990 REGAL

THIS BULLETIN HAS BEEN REVISED TO INCLUDE THE 1990 MODEL YEAR.

Comments on the above vehicles about heater system performance such as being slow to warm up or inadequate heat may be received from some customers.

If the heater system is operating properly and the engine temperature is in the operating range, the cause of the condition may be reduced air/heat distribution from the heater outlet.

This condition may now be addressed by using the following service parts and procedures.

PARTS

QUANTITY PART NUMBER PART NAME -------- ----------- ---------- 1 52452131 Heater Outlet Duct 26 in. *06375 3M #4508 Scotchfoam Black Vinyl Foam Tape

* Purchase Locally

Parts are currently available from GMSPO.

PROCEDURE

- Remove the R.H.hush panel,see Fig.3.

- Remove the ash tray retainer, Fig. 4, and disconnect the wiring harness from the retainer.

- Remove the adapter duct, see Fig. 1.

- Remove the heater outlet duct, see Fig.1.

- Remove the two top screws from the module, one on each side. These two screws will be used to mount the new heater outlet duct, see Fig.2.

- Install the 1/8 X 3/4 in. foam tape to the grooved mounting surface of the new heater outlet duct, approximately 11 3/4 in. across the top of the outlet duct and 7 in. on each side. Trim off the excess tape.

- Install the new heater outlet duct to the module, see Fig.2.

- Install the adapter duct, see Fig.1.

- Using a bench grinder, make a 2 in. long by 3/8 in. deep cutout in the front edge of the ash tray retainer, as shown in Fig. 4.

- Install the wiring to the retainer and install the ash tray retainer.

- Cut off a two inch square piece of the R.H. hush panel as indicated in Fig. 3.

- Install the R.H. hush panel.

- Make sure the ash retainer does not interfere with the new heater outlet duct.

WARRANTY INFORMATION

Labor Operation: T1510 Labor Time : 0.6

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.