Hi all, My car, 2003 MKii 1.9tdi I changed my thermostat the other day as my heater was not working to well, reconnected eveything and the heater worked as it should. Then i decided to flush the system by removing the rubber hose just after the thermostat (about 4" from the block) , this pipe leads to the bottom of the rad. I put the garden hose into the expantion tank and flushed water through, reconnected and refilled system, did this twice, then filled with antifreeze / water mix. brought car to normal temp (90 dreegres) and the internal heater is working fine. The problem is the pipe form the thermostat to the bottom of the rad is cold and so is the rad. I'm guessing its airlocked,but it is meant to be self bleeding. I have done about a 100 miles in the car and everything seems fine, but the lower pipe never gets warm. Max ambent tempture is 10 degrees at the moment. any advice apperciated.