[Chimble]

Hi, I have a problem with the cooling system in my 160 KV6. The expansion tank has started to discharge coolant when hot. The heater is blowing hot but the radiator is cold and the pipe from the thermostat to the rad (the one with the bleed screw) is cold. Radiator fan is also running high but not helping matters because there is no heat in the radiator.

The thermostat and water pump were replaced in January but the problem has only just started. When I open the bleed screw water come out and the hose begins to get warm, between the thermostat and the bleed screw.

Is it likely an air lock has developed? Could there be a blockage in the radiator?
Scratching my head at the moment.

Point to note, when all was running well, the heater worked but not as hot as it is now. It suggests it is getting to hot on that side of the system, hence the discharge from the expansion tank.

Help would be much appreciated.