DIESEL GLOW PLUG SYSTEM - INHIBIT SWITCH INSTALLATION

Model and Year 1982-83 "C-K-P" TRUCK 10-30 SERIES AND 1983 "G" VAN 10-30 SERIES

Many times a 6.2L diesel will not require glow plugs to start, such as a warm engine or warm climate.

To inhibit glow plug system function when engine coolant temperature is above 125 DEG F, the following parts can be installed.

Inhibit wire assembly; should be assembled per attaching draw ing (Figure 3).

GLOW PLUG INHIBIT TEMPERATURE SWITCH INSTALLATION

1. Disconnect batteries.

2. Replace cover on R.H. rear head (Figure 1A) with cover, P/N 14028949 (same as on L.H. head) (Fiqure 1B). Use new gasket, P/N 14028951. Drain coolant as required.

3. Install new temperature switch, P/N 15599010 (with socket wrench, do not use open end wrench) using appropriate pipe thread sealer. Tighten to 19-27 N.m (13-20 lb. ft.). Replace any lost coolant.

4. Connect glow plug inhibit wire assembly to temperature switch.

5. Route the wire assembly toward the left side of the vehicle, strap to the engine harness as required.

6. Disconnect the 4-way engine harness connector from its mate on the glow plug relay extension harness, P/N 12031493 (Figure 2).

7. Remove the light blue wire female terminal from the engine harness 4-way connector and install connector body, P/N 6288704, on this terminal. Plug mating connector on new jumper wire assembly (light blue/black stripe) to P/N 6288704.

8. Insert female terminal (light blue wire) of jumper wire assembly into empty cavity of 4-way connector. Reconnect 4-way connectors.

9. Reconnect batteries.

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.