Question about 1999 Ford F350 Regular Cab

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Heater only blows through defrost

It does not matter where I turn the selector to the blower will only blow through the defrost

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The first thing you want to check with these are the knob somtimes they break and dont turn the switch. pull the knob off and check

Posted on Nov 30, 2008

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Heat/ac


Hello,
You would be wise to check all the small rubber hoses under the hood as it would appear that you have a vacuum leak preventing the airflow door from moving to any other position. Look for cracked /cracking, split hoses or disconnected hoses and replace as necessary.

Good Luck!
Rich Lilja

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