Thread: At redline of fuel economy gauge, a/c tries to suck in fresh air
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Old 06-12-2007, 01:41 PM
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Motorhead Motorhead is offline
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Join Date: Dec 2002
Location: Ca.
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It sounds like you have a vacuum leak in the vacuum system for the HVAC. So when you are into the throttle, the vacuum suply from the engine goes away and you have no reserve in the cars vacuum system. Is there a one way, inline valve that is not working on the vacuum supply line to the cabin? I would think that your car should have a vacuum resivoir somewhere?
Best thing to do is to disconnect the vacuum feed line to the cabin and run a leak down test on it with a vacuum pump with a gauge. Do your vacuum door locks work after the car sits for a while?
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My Truck.. 2007 DODGE, 5.9 Cummins, 6spd stick, 4X4. My car..1977 240D, OTHER WHEELS...1955 VW Oval window bug, European Delivery (Holland) with a 1700cc, 2 barrel, Porsche drum brakes. 1939 WILLYS Pick-up. 1967 Triumph 200cc Tiger Cub. 1976 Honda 550F 4cyl Motor Cycle.
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