Water temperature issue

[vcosmin]

I have a problem with water temp, on analog gauge is around 80/85c , but on climate control diagnostic is not going over 50c, changed the sensor from back of head,but still the same. Some sugestions.

[valjo]

sensor in head is only for motronic. check multifunctional sensor on wather rail under the intake mainfold .....

[vcosmin]

Well, acording to this http://www.sjmautotechnik.com/troubl.../20vmfsns.html
is only for analog gauge, which is working fine. I was thinking that the diagnostic utility from climate control, display the same data that ecu is receving ?

[pasbogdan]

Did you managed to check resistance of the rear sensor?
temp vs approx resistance
40c 1200 ohm
60c 600 ohm
80c 300 ohm
100c 180 ohm

If gauge works fine and coolant is really approx 85-90c you should not be able to hold your hand on the upper cooling hose.If that is happening check the resistance of the rear sensor.
Hope it helps.
Check also temp that ecu sees with diagnostic tools to confirm climate temp is what ecu sees.

[vcosmin]

Just checked witch vagom, temperature is fine, probably is a problem with Climate Control Sensor.

[UrS4boy]

Climate control temperature sensor info

Just checked witch vagom, temperature is fine, probably is a problem with Climate Control Sensor.

This info is related to the AAN but will likely be close to what you need:

http://forums.quattroworld.com/s4s6/msgs/22679.phtml

Note: For RHD C4 UrS4/S6s, the climate control temp sensor is part of the climate control heater valve, not a separate part.