Having problems with your 2000 Chevrolet Astro ?
Does the all wheel drive lock in and out on my astro van mine is staying locked in
This van uses a viscous coupling system much the same in function as the fan on your engine.There is a thick silicone fluid in a housing which is bolted to the water pump. While not mechanically locked,the thick fluid makes the fan turn with the engine.Your van has a transfer case which looks similar to a normal truck unit,but it has a viscous coupler inside ,not gears,so there is a slip factor between front and rear differentials.It is the internal friction of the fluid that drives the front differential,not a locked set of gears. Watch tire sizes, the difference in having 2 new and 2 used tires can cause a noticeable "drag".Always buy 4 tires of the same brand and size for your van.
Repair Help & Product Troubleshooting for 2000 Chevrolet Astro
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