There appear to be multiple responses to be found if trying to “search” on this topic so please accept an apology for raising this again.
I believe that the hoses that join the underfloor pipes are starting to fail. I believe this as occasionally the level in the expansion tank falls. If the clamps are tightened another turn and the tank topped the problem is resolved for many miles/days.
There are no signs of leaks on the floor, and no white smoke on start up, and no mayo in the oil whatsoever.

So, as this TF135 has the thermostat at the head rather than PRT would the panel of wise men recommended changing all hoses and converting to PRT, and if so how difficult is that, or would you stick with the existing arrangement with thermostat on the head?
I am of the opinion that on a high mileage car and changing just one or two hoses would be either pointless or irresponsible.
If changing hoses it gives an opportunity but if would not wish to try something that is not necessary or too difficult to sensibly achieved without expanding the work scope.

Suggestions please.
 

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