Question about Cars & Trucks
Check under hood on passenger side. There are two hard plastic black vacuum lines that go to a ball (vacuum chamber). Trace them to the engine. Chances are one of them are broken. They are HVAC vent control vacuum lines. Usually when they break you're left with this symptom. Happy holidays.
Posted on Dec 25, 2013
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Posted on Jan 02, 2017
You probably have a vacuum leak on the passenger side. its a small plastic hose some times they come unpluged from the engine. or brake.
Posted on Jan 05, 2009
SOURCE: Vent control
You have a vacuum leak.Defrost is the default postion(no vacuum).
See if you can locate the small black vacuum line that goes inside the vehicle on the passenger side near the heater core. The trace it back,should see it going to a canister then to the intake manifold.Make sure it is not disconnected or broken somewhere.
Posted on Mar 02, 2009
Fixed one of these recently--it was a "T" in the vacuum line from the engine near the control switch. The "T" branches to a separate switch on the panel. I cut out the old "T" and spliced in a new one.
Your leak may be elsewhere. Typically, it's where the vacuum line connects to the engine intake manifold, where a hase is used to make the connection there. The other typical failure is the control switch itself. You can access the back of the control panel by taking out 4 screws and pulling it forward. Pull the vacuum connector off the switch and start the engine. The black line coming into the connector should have the engine vacuum on it. If no vacuum, check that "T" and the connection to the engine. If you have vacuum to the switch, the switch is probably bad. You can verify by putting the connector back on and listening for a leak in the switch. If I'm not making sense or you're not familiar with vacuum controlled HVAC, please reply with any questions.
Posted on Sep 15, 2010
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