Unless its blowing i wouldn't worry, my mates is held on by rust and 1 nut :shock:
Has obviously been like it for a while and car was running fine, Discovered it whilst trying to remove aircon bracket, one bolt is up behind the elbow, I struggled like F*ck to get to the very back bolt on the elbow, ( the only one holding his on ). Really need to be under the car, not coming from the front.
When i took my aircon off, one of mine was missing, found it behind the aircon pump bracket.
If it isn't blowing dont worry, for peace of mind remove the heat shield and try to tighten the rest up, may be able to replace the missing 2 but its grief depending on what ones have come off. The one up the back is a f*cker when turbo is on the car
