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heater air ducts cut out on hills 700 1989

posted by  someone claiming to be fixit 2003 on  Wed Aug 23 01:25 CST 2006 [RELATED]

My '89 has a T connection in the engine compartment under the intake manifold back near the firewall. Can't see any checkvalve either. The heater vacuum line goes from there through the firewall and the other branch is a large stiff tube that goes forward to a vacuum resevoir cannister up near the radiator. Maybe your resevoir is not connected or broken leaking vacuum. After the engine is shut off you should be able to move the heater control back and forth and hear a slight vacuum hissing sound as the valves actuate. No hiss no reserve vacuum.






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