GMC 25111868 Module Asm,Cruise Control

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Disconnect the negative battery cable. For an accelerator bracket module: disconnect the harness, remove the assembly, and release the module. For under-dash: remove the left insulator, disconnect the harness, and remove push-in retainers to extract the module. To install: secure the module with retainers, connect the harness, replace the left insulator, and reconnect the battery. Reset radio, clock, etc. as needed.

This cruising speed control system is optionally available on certain models and allows the driver to maintain a constant highway speed without the necessity of continual adjustment of foot pressure on the accelerator pedal. The system employs a servo unit connected to the intake manifold, a speedometer cable-driven regulator and various switches. An override capability is built in. Any malfunction in the performance of the system should first be checked out by inspecting the fuse, the security of the leads and terminals, and the vacuum pipes and connections. The following adjustments should then be checked and if necessary altered to conform to those specified. The servo operating rod which connects to the carburetor throttle linkage should be adjusted. The regulator can be adjusted by turning the orifice tube in or out (never remove it as it cannot be re-installed). If the vehicle cruises below the engagement speed, screw the orifice tube out. If the vehicle cruises above the engagement speed, screw the orifice tube in. Each¾ turn of the orifice tube will change the cruise speed by about 1 mph.Tighten the locknut after each adjustment. The brake release switch contacts must open when the brake pedal is depressed between ¼ and ½-in measured at the pedal pad. The vacuum valve plunger must clear the pedal arm when the arm is moved A inch measured at the switch. The column mounted engagement switch is non-adjustable, and is serviced only as part of the complete turn signal lever assembly. Faulty components should be replaced as complete assemblies after disconnecting electrical leads, vacuum hoses and control cables from them as necessary.

The Vacuum Accumulator is used to maintain satisfactory cruise control performance in vehicles with low manifold vacuum at normal road speeds.

If there is a malfunction in the system's performance, the fuse, the security of the leads and terminals, and the vacuum pipes and connections should be inspected first.

Faulty components should be replaced as complete assemblies after disconnecting electrical leads, vacuum hoses, and control cables from them as necessary.