coolent pipes v6

[Steve42]

hi all ,

have had a loss of coolant for a while now .
its looking like its around the drivers side front.
have today taken the undertray off and if thats to go by then it does comfirm this . also the engine temp is a bit out of sorts . can run as low as 80 then up to 100 in a few seconds .
now it would seem to happen only when car is running as with the engine off no sign of drips. have to top up 2 or 3 days.
car is up on ramps at the moment with no oil in so I cannot start her up till tomorrow.
just thought I would put it out to see if someone has a idea what pipe it could be.

thanks
all