Question about 2006 Ford Ranger

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With AC blower set on MAX, if I have to accelerate or climb a hill, the air switches to the defroster vents. Any ideas on what to check?

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  • n282rs Nov 29, 2009

    The resevoir turned out to be near the right side of the radiator and behind the bumper. It looked like a ball and was working correctly. When I pulled a vacuum tube from it, you could hear it suck in a bunch of air.

    I ended up following some other vac lines around and found one that attached to the right firewall. On the cabin side of the firewall, above the inertia switch, was where I found the problem. I touched the vac line and it fell off in my hand. It was barely hanging on.

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May possibly be a vacuum leak... look underneath to make sure all the vacuum hoses for the vents are intact. there is a small resevoir (usually mounted on the firewall near the brake booster) it looks like a film cannister or similiar. that may have failed. you should be able to similate that same action by flooring it on a level road. you will hear the vents change as it loses vacuum.

Posted on Oct 05, 2009

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It should also be said that Rangers will kick the AC and heat to the defroster to gain power if it is under a heavy load. The vacuum lines eat up power, and if you hit the gas it may or may not push the air to the defroster to save power. If you have the 3.0 or 4.0, it shouldnt happen. If you have a 2.5 or smaller, they do it quite often.

Posted on Sep 28, 2011

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ebay.com
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