Radiator fan does not turn to

At this point, we need to verify if the fan even works. Try turning on the AC and see if the fan turns on.

sounds like problem with the temperature sensor or relay that controls the fan(if electric) check the sensor and relay one may need to be replaced.

There a several reasons why an engine over heats; Low coolant level in the radiator; stuck thermostat, bad water pump, cooling fans that are not working properly. clogged radiator. All of these possible faults need to eliminated one by one.

Check the temp. sensor with a digital voltmeter.never use a test light on a comuterized car.should read same voltage on both terminals when fan energized. Highly suspect coolant temp. sensor @ radiator.

first check coolant level in radiator coolant level sound low.if coolant overflow jug empty.coolant sysyem low, when add coolant to coolant overflow jug coolant level should stay at full cold mark.if coolant level okay,engine overheat while sitting or moving in slow traffic either coolant fan relay or fuse could be bad.or engine coolant temperature sensor could be bad. coolant sensor turn on cooling fan at certain temperature.hot wire check to make sure cooling fan motor not bad or short in wires.if all is good have pcm check it controls fan relay to through the coolant temperature sensor signal when coolant get hot.

it should be right there on the wires coming out of the fan motor or u can wire it without the sensor to stay on all the time and u know it b working then

Did you check the coolant level? if your low on coolant the sensor for the fans won't work, also could be a bad fan motor or just a fuse, if you continue to over heat the car you can do a lot of damage to the engine, blown head gasket, and the VW's are expensive to repair, take it to a good shop and have them check it out.

I would assume that the sensor is probably doing EXACTLY what it is designed to do....measure engine temperature! An engine will get hot when sitting in traffic if the radiator cooling fans are not working. The engine temperature will then go back down when the vehicle starts moving and air begins to flow through the radiator.
Get your radiator cooling fans checked!

Please also review this article: What Else Could Be Wrong?

All you have is one or two fans? Have you checked or replaced the thermostat? The thermostat opens when the engine gets to operating temp, and allows the water in the radiator to flow through engine and the water pump pumps the water out of the engine back through the radiator to cool before it goes back through again. I check the lower radiator hose to see if it get hot like the top hose or you could take the lower hose of the pump to see if it is pumping. I would start with a radiator flush and do this a couple times, prestone makes a flush and Im sure someone else does. do that then change your thermostat, make sure when you put the new one in it goes in spring side down..

It could be the program in the ECM where it may run for a few min before it's commanded by the ECM to shut down or the other thing is the radiator fan Relay may be bad and is sticking in the close loop position and needs to be replaced. A bad Relay may get stuck in the open loop and your not going to have an cool fan working, causing overheating in stop and go traffic. Good luck and hope this helps.