transittaxilad wrote:This engine looks like it's a internal water pump on timing belt, one think now I still don't very much understand (it now not leaking) that coolent does circulate, but not via rad, or any of the two pipes that run to expansion tank, but all others get hot.
I will mention about pump, but to me I sure pump working as it should, as theirs no powersteering loss if it is that type. It's a 2l tdci or is tcdi, with last two letters being red, if that helps to what pump it is.
The water pump is mounted on the front of the engine, connected to the power steering pump, the power steering pump is connected to the drive belt, which is external for all the world to see.
The water pump is connected to the other end of the power steering pump, and there failure is very very very common, the splines which drive it from the power steering pump corrode and first they slip, then they eventually fail. and I'll bet you a big bag of jelly babies that yours is dying.
A heater which goes cold while the engine is overheating is a sure sign of a lack of circulation.
You may wish to consider another garage if yours doesn't know that.