Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 62 (ELECTRICAL COMPONENT LOCATOR)SWITCHES
1999 GMC Forward Control 5.7 R, Automatic
Section 62 (Electrical Component Locator): Switches
1999 GMC Forward Control 5.7 R, AutomaticSECTION Switches
WARNING: This page is about a different car, the 2002 GMC Savana and 2002 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.
SWITCHES LOCATION
| Component | Location |
|---|---|
| A/C High Pressure Switch | On rear portion of A/C compressor. |
| A/C Low Pressure Switch | On refrigerant line, near accumulator. |
| Automatic Transmission Fluid Pressure Manual Valve Position Switch | Inside transmission. |
| Back-Up Lamp Switch | On left side of transmission (part of park/neutral position switch). |
| Brake Pressure Differential Switch | On left frame rail near center of vehicle (part of electronic brake control module). |
| Coolant Level Switch | Under coolant recovery/surge tank. |
| Park Brake Switch | Under left side of dash. |
| Park/Neutral Position (PNP) Switch | On left side of transmission. |
| Power Brake (P/B) Booster Fluid Flow Alarm Switch | Near power steering pump, in outlet hose. |
| Power Brake (P/B) Booster Fluid Pressure Alarm Switch | Near power brake booster, in booster inlet hose. |
| Seat Belt Switch | At driver's stationary belt connector. |
| TCC/Brake Switch | Behind dash, on brake pedal support. |
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.