| [GMCnet] A/C, and heater vacuum controls. [message #332541] |
Fri, 25 May 2018 00:22  |
BobDunahugh
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
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This vacuum control system isn't my strong suit. It's a 78 system. Used my hand held vacuum pump in checking the system. Line from engine intake manifold, to the vacuum tank checked OK. The vacuum tank had no external leaks. But seemed to have internal valve issues of some kind. Took the tank off the 73. Tested fine. Put it in tomorrow. Or I need to find that tank that was on the burned 78 GMC. Seem to have a small leak at the dash control. That's not going to be simple to find. Thinking of applying extremely low air pressure ( Under 1 lbs. ) to the system. Then spray soppy water on the controls to find the leak.. The vacuum line from the engine to the tank is about 4 ft long. It's extremely small, and fragile due to age. Any down side of replacing that small plastic line with a larger rubber hose? HELP. Bob Dunahugh
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