Ok, so I have a 200 tdi which normally runs at around 180F. I have a viscous fan but no fan shroud so it doesn't really do much. made it throught the hot summer like this with no problems. recently I have noticed when in traffic the temp has risen to around 200F, but as soon as I started moving and got air flow it would drop back to 180. today, on a cool day I noticed while sitting at a traffic light that the temp was rising and it climbed to above 200, up to 210 or so. when I started moving it went back down. I was not stopped long and I am worried that if I stop for longer it will continue to climb above 210.
what should I be looking for to cause this sudden rise in temp? also, what is an engine damagiing temp? at what temp should I shut her down if I see it rising?
I have not noticed any coolant loss etc, but will check it when it cools down. I am now at work and can't really go out a and f*** around with the car in the parking lot.