Hello I have an old mk2 p38 2.5 dse diesel its doing my head in it overheats I have put a new head gasket and head on and expansion tank and radiator waterpump thermostat and clutch on the main fan it starts and ticks over great but when I drive it it stays normal the temp gauge but as soon as I stop it overheats I'm baffled can anyone give me advice please
For my money I'd check/clean/buy a new MAP/Iat sensor. After having disconnected the MAF and run with it like that to see if it helps.
(I have had the same problem, diagnosed on here when I gave live data (Foxwell) while driving it. New sensor fixed it.)