I have a vw jetta and the fans stay on even after the ignition is off and key is out, will run until the battery is dead. I have replaced the coolant sensor and the computer sensor on the overhead coolant line to block fans still run. any sugestions?

SOURCE: how to replace a coolant temp sensor on a 2001 vw jetta 2.0

here is a picture of where it's located on your jetta:

SOURCE: how to replace a coolant temp sensor on a 2001 vw jetta 2.0

Yes it is that easy. It should be a 4 pin connector located on the transmission side of the engine head in a plastic flange. Best is to wait for the engine to be cold. Unscew the radiator cap to relieve pressure but screw it right back on. On the 2.0L engines when you unclip the coolant sensor little or not coolant loss will happen if you do this. Just unplug it, pull out the clip, pull out the sensor, and the seal which sometimes stays stuck. Install the new sensor with a new seal lubricated with some coolant, make sure it's well seated and reinstall the clip. The sensor is well seated if the clip fits right over the top, just make sure both sides clipped into position. Replug it fill the coolant with VW original coolant mixed 50-50 with water if needed and done. If you have a fault you might need a scanner to erase the check engine or fault in the cluster.

What's the reason for changing it? Eratic temperature readings?

SOURCE: How do I change the temperature sensor under the

It’s located on the driver’s side of the engine on top /side of the head.. midway.. I don’t think you need to remove the engine cover to see it.. if it is the correct one it will have a dark green top.. the bad version has a black top… but they can all go out to lunch on you if old enough.

To replace.. make sure the car is cool..
You need a hood tool.. or small pair of pliers to remove the retaining clip that holds it in place.
Place a rag under and around it to catch the coolant.. you will lose less than a half a cup.. if that.

Pull the retaining clip back toward you.. try not to drop it.. (another good reason for the rag)

Wiggle the sensor.. pop it out.. and replace with the new green top one make sure you clean the area well.. and when you reinstall the new one that the c clip goes back on straight or it will leak.

Once you see the part out of the box.. you will understand how it works

Start the car.. check for leaks.. run until warm with the heater on.. top up the coolant overflow bottle with distilled water.. (if more than a half a cup.. you should mix the proper anti freeze and distilled water and then top up with that)

Good luck

SOURCE: Code P2185 2005 VW Jetta 2.5 5cyl

There are two coolant temp sensors. One by the oil filler tube and one near the bottom radiator hose near the radiator.
When you flushed the coolant did you replace with VW rated G12 coloant? Very Important! - You can't use over the counter coolant - it'll cause sludge in your system. You have to use G12...

Hope this helps!
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SOURCE: 2005 VW Jetta ignition/key problem

I just had this problem as well... thank god I had a handy AAA guy to my rescue, who used a flat head screwdriver in the ignition to get it to turn a bit, which caused the white lock I could see (that holds the key in while driving) to release... and then I could insert the key... Though I notice this is now becoming a reoccuring issue... so I think the ignition needs replacing...