Question about Volkswagen Cars & Trucks
Posted by Anonymous on
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Posted on Jan 02, 2017
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?
Posted on Nov 29, 2008
SOURCE: cooling fan switch/or sensor
The Coolant temp Sensor is located right under the top radiator hose (on the engine side), with a little black connector!, You might have to remove th etop hose to get to it with a deep socket and extension!.
Also Dont Forget to blled the coolant system by the bleeder valve uptop right near/above the coolant sensor!.(10MM Mini socket w/ extension IIRC!)
Posted on Sep 28, 2009
The MK3 VW's are prone to failure of the "coolant flange", which is located to the right of the valve cover, and will have 4-5 hoses and or sensors sprouting from it.
I'd be willing to bet that this is the source of your leak, not the cam pulley.
The part is inexpensive.
Posted on Mar 15, 2010
SOURCE: need exact location and picture
The exact locations and picture of Engine Coolant Temp (ECT) sensors on 2004 VW Jetta TDI:
1. ECT sensor 1 placed on cylinder head:
2. ECT sensor 2 placed on the left bottom side of the radiator:
Posted on Sep 22, 2010
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