Having problems with your 1997 Ford F150 Regular Cab ?

1997 F-150. No air out of dash vents. Fan and climate blow out of def. and floor. Replaced fuses , still no air out of dash.

Posted / edited by AnonymousUser on : 19-07-2021

Answers :

Hi, the mode switch is actually vacuum operated, so it isn't a fuse. The usual failure mode is a loss of vacuum supply due to a leaky hose, but the mode switch may also have developed a leak. Look for a thin plastic vacuum line that runs for the engine intake manifold thru the firewall to the climate control panel. Check the connection to the intake manifold--it is usually a rubber hose stub that can get brittle and start leaking. If that is good trace the plastic hose into the truck and to the control panel. There may be a "T" near the panel that can also leak. Start the truck and listen for vacuum leaks near the control panel. Below are instructions for removing the control panel. If there is vacuum to the control panel and the swich is not leaking, the problem may be with the mode door actuator. Trace the plastic vacuum lines from the control panel to the vacuum actuators on the mode doors and check to make sure the actuators are not leaking vacuum when the mode selector is changed. Please let me know if you have any questions, and thanks for using FixYa.
  1. \015\012Disconnect the negative battery cable.
    \015\012 \015\012
  2. Carefully pry to release the four clips retaining the center instrument panel finish panel. \015\012 \015\012
  3. Detach the two passenger air bag defeat switch electrical connectors. \015\012 \015\012
  4. If equipped, detach the 4WD control switch connector. \015\012 \015\012
  5. Remove the center instrument panel finish panel. \015\012 \015\012
  6. Remove the climate control assembly retaining screws. \015\012 \015\012
  7. Pull out the climate control assembly. \015\012 \015\012
  8. Detach the electrical connectors. \015\012 \015\012
  9. Detach the vacuum line connector. \015\012 \015\012
  10. Remove the control panel. To install: \015\012 \015\012
  11. The installation is the reverse of the removal.
These have blend doors in the HVAC system behind dash...normally this problem will be that the door which controls dash vent circulation will be stuck shut or sometimes the door pivot will wear itself and cause the door to lock itself in one position...Also the are controlled by actuators which will sometimes fail due to normal wear...You can pull the control knob to make sure it isnt cracked or broken allowing it to not engage that particular selection...You can carefully use small neddle nose plyers to turn selector and double check the selector by hand ......The only way to check the actuators and the door operation is have a Ford dealer connect scanner to analyze the cabin control operation of the HVAC system...Normally it is the doors or actuator...sometimes the door will stick and cause the actuator to fail also from pressure if you keep trying over and over...
\012So to save money have dealer to scan it and it will show you instantly where problem lies.....This will save you a lot of time...It is doubtful that the switch has failed considering it works..Normally if switch fails nothing can be controlled....Dash removal is required to repair doors...Parts stores have scanners that might give you a code only but may not lead you to the exact problem......
\012But a dealer scanner will tell you exactly where problem is rather than just a code.................
\012...........Hope this helps.....................Comments welcomed...................Metalpoet.
Repair Help & Product Troubleshooting for 1997 Ford F150 Regular Cab

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