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Old 05-14-2012, 05:37 PM   #1 (permalink)
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Default what are the symptons of a faulty blend door actuator?

what are the symptoms of a faulty blend door actuator?
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Old 05-14-2012, 05:39 PM   #2 (permalink)
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One major thing that can happen is that no matter what setting, it won't blow out your dash vents. Just the windshield vents. It defaults that way so you can have defrost available if there is an issue with it.
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Old 05-14-2012, 07:46 PM   #3 (permalink)
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^ The "default to defrost" is due to an hvac vacuum leak. With a faulty bda, you'll probably hear a clicking (thumping) in the dash (plastic gears stripped) and won't be able to regulate temperature. Remember, vent (mode) selection is vacuum controlled. Temp. selection is elec. controlled via the bda.

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Old 05-15-2012, 12:04 PM   #4 (permalink)
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We're entering the cooling season, and a 'broken' blend door defaults to cooling, so you've got some time to fix this problem. It's in the winter when you want heat that a malfunctioning blend door becomes a problem. I propped mine up for awhile with a small piece of plastic jammed into that silver sliver bar to keep the door in the 'heat' position until I replaced the Actuator (which had cracked teeth on one of the gears). The replacement's been in there for about 5-7 years, but just recently I heard a noise coming from underneath the dash again. If it's the Actuator (again), I guess they only last for about 7 years before the plastic gears inside fail!
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Old 05-15-2012, 08:14 PM   #5 (permalink)
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^+1. They (bda) usually (not always) fail to cold.
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