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07-04-2010, 10:29 AM
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#1 |
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Registered User
Join Date: Sep 2003
Location: Lee's Summit MO 64086 (Kansas City)
Posts: 128
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A/C Control Vacuum Leak
On our '72, the AC, heater dash control is leaking vacuum in all switch positions, some positions worse than others. I disconnected all the hoses and found it is leaking at the switch body. Have an extra control, and the switch appears to leak on it too. Is this normal? Does anybody know if these are available new?
Thanks Don
__________________
Thanks Don '57 Chevy Nomad '70 Buick GSX '72 Cheyene (Boys' truck) |
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07-05-2010, 11:08 AM
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#2 |
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Senior Member
Join Date: Jul 2001
Location: Muskegon,MI,USA
Posts: 6,026
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Re: A/C Control Vacuum Leak
The control should not be leaking. Does your truck have a (3) port control or (2) port control? It should have the (2) port as in the diagram. If there is a (3) port control does it have all ports with a vacuum hose plugged to it?
Jim
__________________
1971 Shortbox step side 4x4, 350 sbc, 3:07 rear end 1965 Impala SS 400 sbc, Muncie rock crusher 1966 Impala SS 396 bbc, TH 400 1969 El Camino, 350 sbc, TH 350 1971 Snowplow built on a Blazer frame 1972 GMC Short bed, stepside, TH 400, 427 BBC |
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07-05-2010, 11:54 AM
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#3 |
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Registered User
Join Date: Sep 2003
Location: Lee's Summit MO 64086 (Kansas City)
Posts: 128
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Re: A/C Control Vacuum Leak
I have both a two port and a three port. The three port is in the truck now and all the ports are connected. I even unplugged the two out going ports with my finger and it still leaks.
__________________
Thanks Don '57 Chevy Nomad '70 Buick GSX '72 Cheyene (Boys' truck) |
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