This one even baffalled my main dealer, his words "well it's not over heating, so see how you get on with it".
First noticed the temp gauge wasn't getting up to temp so as you do change the thermostate and i even changed the housed, checked the t piece on top and put it all back together. with anti freeze and bleed the system of air.
Same problem still, even put another thermostate in and checked it worked before fitting..all was ok with stat.
Still same prob, then i notice the small pipe from the stat houseing going to exspasion tank isn't getting hot neither is the pipe from the bottom of the exspansion getting hot, the one that goes to the pump.
So in to fords with it i went armed with me receipts for the stats etc.... 6 hours later they phoned and said all done , they said they bleed the system and all was ok.
Only a few miles up the road the temp gauge went down but i carried on for another 20 miles and thought i would have a look under bonnet and guess what these pipes and the exspansion tank were all still stone cold.
So back to fords i went the next day and that when he told me..."well it's not over heating, so see how you get on with it".
Any one with idea's
PS heat comes through in to car great