GMC 2001 Envoy - Manual (Page 425)

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Manual Transmission Check
Check the transmission fluid level; add if needed.
See “Manual Transmission Fluid” in the Index.
Check for leaks. A fluid leak is the only reason for fluid
loss. Have the system inspected and repaired if needed.
Automatic Transmission Check
Check the transmission fluid level; add if needed.
See “Automatic Transmission Fluid” in the Index.
A fluid loss may indicate a problem. Check the system
and repair if needed.
Hydraulic Clutch System Check
Check the fluid level in the clutch reservoir.
See “Hydraulic Clutch Fluid” in the Index.
A fluid loss in this system could indicate a problem.
Have the system inspected and repaired at once.
At Least Once a Year
Key Lock Cylinders Service
Lubricate the key lock cylinders with the lubricant
specified in Part D.
Body Lubrication Service
Lubricate all hood hinges, hood latch assembly,
secondary latch, pivots, spring anchor, release pawl,
door hinges, fuel door hinge, endgate hinges, outer
tailgate handle pivot points, tailgate hinges, tailgate
mounted spare tire (if equipped), glove box,
console doors, moving seat hardware and folding
seat hardware. Part D tells you what to use.
More frequent lubrication may be required when
exposed to a corrosive environment.