SOURCE: VW COOLANT TEMPERATURE SENSOR
while looking at the engine from the front, locate the transmission, come up the side of the engine and you will see a plug that is connected to a hose. that is were the temp sensor is located. remove connector and take a flat head screw driver and a pair of pliers and back out the c clip. pull the senor out and make sure you reach down in side and removed the old o ring. toss them to the side. the top of the sensor is either black or if it has been replaced before it will be green. take some of the coolant and rub it on the new o ring before installing the new one. install the new sensor, while pushing down on the sensor reinstall the c clip start the car and let it get to operating temp. shut the car down, reopen the hood and SLOWLY release the pressure in the coolant system to bleed any air in the system. and POW your done. total time of repair..about 15 minutes at the most.
SOURCE: oil in water resovour vw 2002 passat
This is probably a head gasket problem and not an oil cooler problem.
The oil cooler is fairly easy to test.
Remove the cooler from the engine but do not disconnect cooling lines and then pressurize the cooling system. You can use a radiator test tool to put pressure on the cooling system and look for leaks. If it leaks, replace it.
You may also be able to bypass the oil cooler altogether if it leaks.
The head gasket is another story.
Get a 1/4" pipe to spark plug fitting and put a male air coupling fitting in it.
Then you can charge the cylinders with air from your compressor.
Make sure each cylinder that you test is at top dead center so that the valves are closed.
If air bubbles into your coolant, you found your problem.
If air leaks out your intake you have a bad intake valve
If air leaks out your exhaust you have a bad exhaust valve etc.
If you find this useful, please take the time to rate it.
Tim
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: oil in water resovour vw 2002 passat
Could be just the OIL COOLER. VW IS CORRECT.
If the oil cooloer fails internely you will have a mix of coolant and oil. In the engine and in the Radiator,
But not to say the other guys were wrong...
SOURCE: Where is the camshaft position sensor located in a 2001 VW Passat
when you are looking at the engine pull off the plastic cover on top then the front cover that covers you timing belt there is a wire harness tha goes right to it in the left upper coner two ten mil bolts and it comes off careful not to drop bolts down in belt that could be bad. it is that easy
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