Heat/AC controls

[YZF1R]

Kind of a dumb question but, with the Duramax, how do the controls work? I remember the old gasers had a vacuum manifold behind the dash with a slide valve in it. Is there a vacuum pump? (Don't remember seeing one on the motor.) Do they use servo motors to switch the vents around? Just wondering.

Steve

[More Power]

Moved to "2500HD/3500 Truck & Drivetrain" forum.

MP

[hoot]

Steve,

They've been using servo motors since 1988.

[YZF1R]

More Power - Sorry it was in the Duramax forum. Thought that it might be Duramax specific as there is no vacuum.

Thanks hoot. Since 1988? Been too long since I had a new truck. I wonder how many motors are in these new trucks?

Steve

[hoot]

I believe the 88-98's had three. I don't know about the new ones. BTW: they are quite reliable.

And in case you didn't know, there is no cable between the throttle and the engine. It's an electronic (drive-by-wire) throttle. They have been that way since '94.

[ 05-20-2002: Message edited by: hoot ]</p>

[YZF1R]

hoot - Yea, I knew about the drive by wire. Boy, you loose the electric these days your done. :rolleyes: