The fix is easier than it sounds. You need an allen wrench.
Warning: The wiper arm/ motor assembly MOVES in a circular motion. Use care when exposing this assembly.
If your wipers don't park or if they stay in the up position when in the delay mode, you probably have to reset the cam position on the arm assembly. Remove the plastic cap covering the arm / motor assembly located under a plastic cover on the passenger firewall. Once you remove the plastic "hinged" cap on the arm/motor assembly, you will see a silver cam. Note that there is a pin that seats in a groove on the cam. If you had shut off the wipers, and they didn't park, look at the pin location. It should be at least 90' clockwise of the groove. In order to adjust this you will need a 4mm allen wrench to remove the center screw so you can lift the arm assembly off the motor. Lift the motor up and move the wipers by hand to the park position. Slide the pin out of the slot and turn the cam so the pin moves almost 180' from the seating groove (you may have to partially place the assembly back slightly on the mounting post)this will allow the cam/arm to be placed back on the motor and have enough length in the arm to seat it. (When the top part of the cam is turned, it moves in an elliptical motion and therefore has a "short" and "long" setting.) Place the arm/cam assembly back on the post making sure the bottom of the cam, which has a cut out in the bottom and you will also see a little spring/sensor that is mounted on the underside. This spring/sensor has to be 4-5 mm away from the tab on the mounting surface. Seat the assembly with the cutout portion of the cam centered with the tab on the mounting surface. This will get you real close to that 4-5mm distance. Tighten allen screw to 125 inch pounds.
The Only time the pin is in the groove is when it is DELAY mode.
If you have the pin in the groove when it is parked, it is wrong and more than likely the wipers are not down all the way or the wipers stay in the up position when in the delay mode before cycling. Hope this helps. Posted on Jan 10, 2016
Check ground strap to wiper motor if ground is ok the park position is malfunction replace motor
SOURCE: replace thermostat 2003 pontiac montana
yes but with the right shaped wrenches and tiny hands it can be done without removing the exhaust crossover pipe
SOURCE: how to put out the radio in montana 2003
there are 4 screws. two in the front behind the cup holder and two up underneath in the cupholder bay after the cupholder is removed. they are phillips head and 8mm I believe. this is all you need to remove the cover.
SOURCE: 2000 pontiac montana wipers stuck
This has happened a couple of times on my 1999 Pontiac Montana. Here's what I did to fix. Open the hood. Remove the shield over the the wiper cam mechanism on the passengers side. This is easy to access. Road salts and other dust and dirt gets in there and causes the sticking problem. Spray WD-40 in between the parts. Get in there with that little red spray straw and saturate it good, flush junk out. Get in the car and try the wipers. If I remember, you might have to manually place that little knob or lever on top of the cam in the opposite position to get it to resync, but try it first. Be sure the wipers are off when you're spraying the WD-40 so you don't injur your hands. I've had to do this twice and it worked both times.
SOURCE: 2003 Pontiac Montana Front Wheel Bearings
Remove the wheel, remove the hub nut, remove the brake caliper and rotor, put your socket and extension through the hub flange onto the bearing retainer bolts, undo them, release the abs sensor connector if it has it, remove the bearing and hub flange as an assembly, put the new one on and go backwards from here. Torque the hub nut to 180 ft/lbs, your done.
SOURCE: Timing off on Pontiac Montana wipers
On top of the window motor there is a timing cam -- there is a little tab on the bottom that is most likely broken or bent. You need to replace the cam.
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