DIESEL GLOW PLUG SYSTEM - INHIBIT SWITCH INSTALLATION

MODELS: 1982-83 C/K/G/P 1500-3500 WITH 6.2L DIESEL

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 attached drawing (Figure No. 3).

GLOW PLUG INHIBIT TEMPERATURE SWITCH INSTALLATION

1. Disconnect batteries.

2. Replace cover on R.H. rear head (Figure No. 1A) with cover 14028949 (same as on L.H. head) (Figure No. 1B). Use new gasket 14028951. Drain coolant as required.

3. Install new temperature switch 15599010 (with socket wrench, do not use open end wrench) using appropriate pipe thread sealer. Tghten 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 12031493 (Figure No. 2).

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

8. Insert female terminal (lt. 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.