I havnt got a thermostat fitted to my engine, that's one of the many next jobs to do. Without a stat fitted how should it be, should the flap on the heat exchanger be open or resting on the heat exchanger which I thought should be in the closed position, which I could be wrong, as her indoors tells me I often am..
:Yawn: T4 need flaps (at least the N/S one) in place or you'll get very little oil cooling. If you want to respond by saying that yours has been like this for years with no problem I won't bother to argue with you though - life's too short and it's your money...