IMPROVED HEAT (REPLACE HEATER CORE)

VEHICLES AFFECTED: 1988-89 C/K TRUCKS

Some owners of 1988-89 C/K trucks may comment regarding a lack of sufficient heat from their heaters. For improved heating, a revised heater core has been released to production after the following VIN breakpoints that will increase heater output 2.5 -4.5 degrees C (5 - 8 degrees F.).

OSHAWA --- GMC 2GTEC14KXK1550411 --- CHEVROLET 2GCGK29K3K1212682

FT. WAYNE --- GMC 1GTDC14K1KZ541132 --- CHEVROLET 1GCDC14K2KZ239512

PONTIAC --- GMC 1GTFC24KXKE538400 --- CHEVROLET 1GCFK24KOKE232454

The new heater core has 38 fins/inch verses 30 fins/inch on the old heater core. Some reduction in air flow maybe noticed.

Base heater ---- 52452918 With A/C or Deluxe heater ---- 52452915

For repairs to vehicles under warranty use the appropriate labour operations and times from the labour time guide.

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.