Morning people, As some of you know I recently rebuilt my pd and it has been running fine no probs with temperature or running, i had the head skimmed replaced the water pump and it hasn't missed a beat, however when the car is hot the coolant level in the header tank drops well below minimum and the top rad hose is rock hard, when I take the expansion cap off the level returns back to exactly the same place .... I noticed that there was no coolant flowing into the header tank via the top pipe on tickover unless you rev the engine, I have also observed that the bottom rad pipe is stone cold ? Does this sound like a dodgy thermostat ? Or an airlock ? Or worse
As always any thoughts are appreciated
As always any thoughts are appreciated