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The V6 in the Saturn VUE is sideways (FWD) vs. the version used in the Cadillac Catera (RWD). On the Saturn, the crank sensor is mounted on the front side of the engine, sort of near where the trans mounts to the engine. Pretty easy to change.
Saturn Shop Foreman here, old school GM window crank remover or use a shop rag behind the crank to grab the tangs of the clip and pop it out, it will fly like the wind if you don't watch out!
http://www.kick-fix.com/t-belt/tbelt.html
It is on the front of the crank shaft. It seals the oil at the crank pulley.
The window crank slips because the regulator gear has most likely stripped. You will need to remove the outer door panel to verify for sure but unless the crank is broken (It would fall off if it was) the regulator is stripped
Pull the balancer then the seal. NOT EASY
http://www.saturnfans.com/forums/showthread.php?t=46123
on the front of the motor under the front crank it has a plug going to the crank.
the crank position sensor is located in front of the oil filter on the left side of the engine in front.
There is only one crank sensor fitted, you may also have a cam sensor. the crank sensor is located either around the bellhousing or around the front crank pulley. It either has 2 or 3 wires. It picks the signal off the revolving crank so look for a sensor in the block near flywheel.
remove belts,remove crank pulley,remove seal.you need to check front cover they are bad about timing chain rubing holes through it.
The crank sensor is located on the front side of the crank pulley, between the pulley and radiator.