Question about 1996 Ford Ranger SuperCab

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2008 ford rangerhave vacuum but no heat - 1996 Ford Ranger SuperCab

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Air Temperature Control Blend Door Failure No Heat or no AC (dependes on where door sticks)

In all modern cars there is a tiny DC electric motor driven gear drive that moves a plastic door that blends heated and cooled air from the AC and the heater core, this is called (interestedly enough) the air temperature control blend door actuator. The motor that moves this door fails because the door starts sticking from warping, most common complaint is no heat but it can be no AC as well. To replace these parts (blend door and blend door actuator) you must remove the entire dash from the car. Always have this problem confirmed by a dealer or qualified repair shop as it is a very expensive repair.

Other causes of no heat in the cabin are engine thermostats that are stuck open (engine runs cold) or air bubbles in the cooling system.

Posted on Nov 09, 2012


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Heat and a/c is controlled by a vacuum servo on the rear heater box. if vacuum is lost then the servo defaults to heat. I recomment removing the rear left quarter trim to access the vacuum servo(servo cylindrical and a little smaller than 1/2 soup can, it has a flat metal rod sticking out). Use a vacuum pump to test the servo and see if it moves and holds vacuum. If it doesn't work them replace it. If it does work then test to see if there is vacuum at the hose that attaches to the servo (with engine running try test in both a/c and heat modes) it should have vacuum in a/c mode. If no vacuum is present then you will have to trace the vacuum line back to the heater contol head looking for splits or cracks. At the heat control head you can test to see if vacuum comes from the control head or not. I suggested starting in the rear because servo failure is rather common since it is only used seasonally.
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