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 718 (HEATING, VENTILATION & AIR CONDITIONING)SPECIFICATIONSFASTENER TIGHTENING SPECIFICATIONS
1999 GMC Forward Control 5.7 R, Automatic
Fastener Tightening Specifications
1999 GMC Forward Control 5.7 R, AutomaticSECTION Fastener Tightening Specifications
WARNING: This page is about a different car, the 2002 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.
Fastener Tightening Specifications
| Application | Specification | |
|---|---|---|
| Metric | English | |
| A/C Compressor Lower Bolt - 3.1 L | 50 N.m | 37 lb ft |
| A/C Compressor Bracket Lower Bolt - 3.8L | 50 N.m | 37 lb ft |
| A/C Compressor Bracket Upper Bolt - 3.8L | 50 N.m | 37 lb ft |
| A/C Compressor Front Nuts - 3.8L | 100 N.m | 74 lb ft |
| A/C Compressor Hose to A/C Compressor Nut/Bolt | 33 N.m | 24 lb ft |
| A/C Compressor Hose to A/C Condenser Nut | 16 N.m | 12 lb ft |
| A/C Compressor Hose to Accumulator Nut | 16 N.m | 12 lb ft |
| A/C Compressor Pressure Relief Valve | 9 N.m | 80 lb in |
| A/C Refrigerant Pressure Sensor | 4.7 N.m | 41 lb in |
| Accumulator Bracket Bolt | 4 N.m | 36 lb in |
| Air Distributor Case Cover Screws | 1.5 N.m | 13 lb in |
| Air Duct Bolts | 10 N.m | 89 lb in |
| Air Duct Center Screw | 1.8 N.m | 16 lb in |
| Blower Motor Bolts | 1.3 N.m | 12 lb in |
| Blower Motor Resistor Bolts | 1.5 N.m | 13 lb in |
| Evaporator Core Block Fitting Bolt | 16 N.m | 12 lb ft |
| Heater Core Cover Screws | 1.5 N.m | 13 lb in |
| Heater Core Line Clamp Screw | 1.5 N.m | 13 lb in |
| Heater Core Mounting Clip Screw | 1.5 N.m | 13 lb in |
| Heater Core Outlet Cover Screws | 1.5 N.m | 13 lb in |
| Heater Hose Support Bracket Nut - 3.8L | 4.5 N.m | 40 lb in |
| Heater Inlet Pipe Adapter Bolt - 3.8L | 7 N.m | 62 lb in |
| Heater Inlet Pipe Nut - 3.1 L | 7 N.m | 62 lb in |
| Heater Outlet Pipe Adapter Bolt - 3.8L | 7 N.m | 62 lb in |
| HVAC Module to Dash Bolts/Nuts | 10 N.m | 89 lb in |
| HVAC Module Upper Case Screws | 1.5 N.m | 13 lb in |
| Liquid Line at Block Fitting Bolt | 16 N.m | 12 lb ft |
| Liquid Line Nut at Condenser | 27 N.m | 20 lb ft |
| Liquid Line Nut at Orifice | 27 N.m | 20 lb ft |
| Recirculation Housing Screws | 1.5 N.m | 13 lb in |
| Service Valve | 12 N.m | 106 lb in |
| Suction Hose at Block Fitting Bolt | 16 N.m | 12 lb ft |
| Suction Hose Nut at Accumulator | 47 N.m | 35 lb ft |
| Vacuum Tank Screws | 1.5 N.m | 13 lb in |
RENDER: 1.0x
NO RELATED
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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.