Keeps loosing power after about 40 miles... Judders and looses speed. After a rest of an hour seems to work. Told it may be over heating but air flow switches are apparently working
Any thoughts or advice... Sitting by the m6 for the second time in a few hours!
I have no idea what sort of vehicle you are asking about. Is there any temperature gauges on the dashboard? When you stop do you look into the engine bay? Does it look, smell or sound hotter than it should?
My dad had a VW camper years ago with similar problem. After many visits to the dealer it was never solved and he sold it to a workmate letting him know of the problem. The new owner took it down to the south of France and hadthe same problem. However some little countryside garage found what the V W dealer couldn't,a sliver of metal inthe carb,hey presto no more problems.