CRANKCASE VENT HEATER SHORTED (REPLACE VENT HEATER)

Subject: CRANKCASE VENT HEATER POTENTIAL SERVICE ISSUES (DIAGNOSE/REPLACE CRANKCASE VENT HEATER ASSEMBLY)

Models Affected: 1992 GRAND AM MODELS W/2.3L ENGINE

ENGINE APPLICATIONS: 2.3L (VIN A, D, and 3) (RPO LGO, LD2, and L40)

CONDITION:

--------- Several conditions may occur depending on car line. The N car may have an ABS light on, no HTR-A/C or Daytime Running Lights (HTR-A/C fuse blown). Service conditions are not limited to the examples given above; refer to the bulletins referenced below and Section 8A in the respective Service Manual for additional systems which may be affected.

CAUSE:

----- The crankcase vent heater assembly may have shorted out.

CORRECTION:

---------- Replace the crankcase vent heater assembly if assembly has shorted out (GM P/N 24572353 Heater, Crankcase Vent).

SERVICE INFORMATION:

Review Section 6E3-C13 Service Bulletin 92-6-43 issued 4/92 and Section 8A Service Bulletin 92-8-22 issued 5/92 to determine if crankcase vent heater has shorted out. Replace the crankcase vent heater as needed.

Section 8A-32 in the Service Manual is the wiring schematic information for the crankcase vent heater assembly.

Parts are currently available from GMSPO.

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.