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Ken S
Dodge Dakota
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4/22/2008
22:24:03
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 Subject: vent going crazy???!!!
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Message:
I was pulling a trailor the other weekend about 370 miles roundtrip. This trailor was pretty heavy (or at least for my 3.9L V6. Whenever I go up hills and have the gas pressed down hard for a while the vent (no a/c) would cutoff and go to the defrost, but when I let off the gas, it comes back to the vents....???? Any particular reason why this would be happining?
I was thinking maybe it's trying to cool the engine, but the engine was running @ normal temp. Around 190deg or so (I think).
It would do this every once and a while, not necessarily all the time.
Any help would be great.
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Epyon
Dodge Dakota
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4/22/2008
22:48:05
|  RE: vent going crazy???!!!
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Message:
Just a guess but those controls for the vent work off engine vacuum pressure. Could have been such a dramtic change in engine vacuum they just went nuts for a bit
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Josh
Dodge Dakota
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4/22/2008
23:54:14
| RE: vent going crazy???!!!
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Exactly right. The controls are vacuum operated, and those long stretches with the pedal down don't provide enough manifold vacuum to replenish the reservoir.
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Ken S
Dodge Dakota
JOIN HERE
4/28/2008
21:45:47
| RE: vent going crazy???!!!
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Message:
That's makes perfect sense. Thanks a lot for the feedback. I was just making sure something wasn't screwing up.
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