tonight on way home from work my scoob started overheating whislt i was stuck in traffic, the heaters started blowing cold, soon as i started moving again the temp gauge went back to normal and the heaters went hot again, just had a quick drive round and then let it idle for 5 mins to see if it would happen again, but it didn't, any ideas?

 

That happened to me,shortly before my radiator blew.

 

oh brilliant!! just what i wanted to hear!! haha well i supose it's better than getting a head gasket done which i thought may be the cause. il check the radiator at the weekend!!
cheers

 

Sounds like sticky therostat. Go get a new one.