ENGINE BLOCK HEATER/HT4100 INSTALLATION PARTS

MODELS AFFECTED: ALL MODELS EQUIPPED WITH HT4100

Engine block heater parts have been released for all HT4100 engines through GMWDD. The parts required to install the block heater are as listed below, and should be installed as shown in Figure 1.

Quantity Per Engine Name P/N -------------------- ---- --- 2 Engine Block Heaters 1627549 2 Engine Block Heater Cords 1627550

When connecting the heater cords to an electrical outlet, an outdoor extension cord with two female connections, capable of carrying 300 watts of current, must be used. These extension cords are readily available through automotive part and tool suppliers.

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.