Heater and A/C controls not working.

FORD RANGER
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TIM55ECK
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I have a 97 Ford Ranger. 100500 miles 4.0 liter. The problem I am having is that out of the three controls on the dash this is how they work. The fan knob works fine , the temperature knob has no control. All I get is hot air no matter what. The contol switch for a/c heat etc. It will trun off the over all a/c and heat but all I ever get is defrost. So this is how it works Defrost with high heat blowing or nothing at all
I have taken out the panel and replaced it with no results. It still does the same thing. I am told that this may be a vaccum problem . Where do I start if this is so.
Apr 11, 2007 at 3:43 PM
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2CARPRO JACK
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There is a small vacuum source line under the hood for the controls. Usually comes through the firewall near the heater hoses or a/c lines. Probably broken, cheap plastic and very hot under the hood
Apr 12, 2007 at 8:22 AM