Question about 1997 Ford Econoline
The mode valve is new. But the control head is original. Do you think the control head could be having problems, and is what is causing the mode valve to move some while running down the road. Don't the mode valve move according to where you switch the knob on the control head. (Off, Vent, Norm. Ac, Max Ac, floor, mix, defrost, etc.)?
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Posted on Jan 02, 2017
SOURCE: ac vent problem
the vacuum canister is located under the battery tray on this model truck, however the most common problem are the vacuum lines that run around the battery box. usually the battry will leak acid at some point in time and create holes in the small hard plastic lines. i would remove the battery and check the vacuum lines first.
Posted on Aug 18, 2008
Check the white vacuum hose going to your recirculation door outside under the hood. It is located on the passenger side firewall . The hose becomed brittle and falls apart. I get small vacuum hose and cut into the wiring harness to locate a good section of hose.Put hose to vacuum motor. Good luck.
Posted on Aug 10, 2009
the problem is more than likly a vacuum leak. look under the hood on the emissions lable and find the vac line that goes to the HVAC system. if you se the leak there great otherwise unless you work in an auto shop like me what i have done is smoked a cig and blew in the line to find the leak. the smoke will escape where the leak is...
Posted on Nov 19, 2010
SOURCE: 1997 Ford F150 Air Management
The air flow is controlled by vacum. I would start by inspecting all the hard plastic vacum lines under the hood. If you find none broken or loose , then inspect the control panel. by "default" the air is derected to the defrost position.
Posted on Aug 08, 2011
Testimonial: "Helpful. I know it could be the check valve but don't know how to test it. I also don't know how to take apart the dash to get to the control panel."
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COMPONENT TESTING Carefully check for cracks or leaks in the vacuum lines or in the canister itself. The lines and fittings can be reached without removing the canister. Cracks or leaks in the system may cause poor idle, stalling, poor driveability, fuel loss or a fuel vapor odor.
Vapor odor and fuel loss may also be caused by: fuel leaking from the lines, tank or injectors, loose, disconnected or kinked lines, or an improperly seated air cleaner and gasket.
If the system passes the visual inspection and a problem is still suspected, proceed as follows:
REMOVAL & INSTALLATION
Canister Purge Solenoid Valve
See Figure 2
The purge solenoid valve is mounted on the engine, towards the rear and below the intake manifold.
Fig. Fig. 2: The canister purge solenoid is mounted below the intake manifold
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