Operation CHARM: Car repair manuals for everyone.
Home >> GMC >> 1991 >> Syclone V6-262 4.3L Turbo >> Repair and Diagnosis >> Heating and Air Conditioning >> Refrigerant >> Service and Repair >> Vacuum System Check
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the logical successor to CHARM, I recommend you try it!

Link: lemon-manuals.la

Vacuum System Check

VACUUM SYSTEM CHECK

Before connecting the vacuum pump to the system, run the pump connected to the low pressure gage to determine the vacuum pump capability. If the vacuum system is unable to reach 711.2-736.6 mm (28 to 29 inches) or more vacuum, check for leaks. If no leaks are found, check the vacuum pump.
pro multis · About Operation CHARM