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When i turn my ac on anything but vent it switches to defrost mode
2003 Ford F-150

When i turn my ac on anything but vent it switches to defrost mode

(2003 Ford F-150)
It blows out cold just on defrost
Tags: ford, f 150
1 answer & 1 comment
Popular Answer
on October 05, 2019

HVAC mode selector is vacuum controlled - *hands-on* testing by ‘qualified’ personnel is required to locate vacuum circuit malfunction.

Good luck!
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on October 05, 2019

Defrost is the default mode.

IF you possess the skills necessary to perform the required testing / troubleshooting - let me know by replying here.
General Diagnosis
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on October 05, 2019

HVAC mode selector is vacuum controlled - *hands-on* testing by ‘qualified’ personnel is required to locate vacuum circuit malfunction.

Good luck!
Sign in to reply
on October 05, 2019

Defrost is the default mode.

IF you possess the skills necessary to perform the required testing / troubleshooting - let me know by replying here.

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