99 CHEVY VENTURE HOW TO GET AT AND REPLACE DRIVER SIDE ACTUATOR TO OPEN AND CLOSE DOORS.

Check the Blend Door Actuators

https://www.google.com/search?q=99+oldsmobile+alero+blend+door+actuator

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Temp. blend door actuator is probably the problem .
How to Replace DRIVER Side Heat Door Actuator Chevy Impala 2006 2013 DIY

Both sides have their own modules. They are behind the panels right beside the middle seats. Remove the back seats (if you have third row seating) Pull the panel (they pop off). Either replace the module or disconnect it and manually open and close the side door.

should be in the center part of the dash look under from the drivers side floor board close to accelerator pedal looking up should be mounted on the side of heater a/c box

Look too see in the bottom of your door track to see if there's something stuck in there

The lock actuator is broken. Seems as if it went out in the unlock position. So you cant lock it. Replace the actuator and you will be able to lock it again.

How it mounts to the moving armis a touch too far forward.

Chances are the door latch has closed without the door being closed.

Inspect the latch mechanism on the door. I suspect you will find that the latch is in the closed position.

Use a screw driver to take place of the normal jam pin in the latch apply tension ( like the tension that would be present normally opening the door) and actuate the door handle.

Make sure to lubricate once you do get the latch to open.

It sounds as though one of the proximity sensors is faulty. Also try giving the tracks for the door a good shot of white spray lithium grease. The door may be binding enough so that the emergency reverse is kicking in.

Your chevy uses two fuses for the system. The power lock actuators are on the 15 amp fuse inside the truck. The fuse for the switches (locks and mirrors) are under the hood. For 99 to 04 (I think those are the years) there is a TSB on replacing the 3 amp fuse under the hood with a 5 amp fuse because this is a well known problem of having these blow.

Your drivers side window is a different issue. If the rest are working your problem is in the motor or getting power to the motor. The wires that go from the body to the door often crack and break with the opening and closing of the door.