Have high pressure within the coolant system. Engine temp is showing as expected (1/2), no heat from heater. When i removed expansion cap to realese pressure loads of air came out as well as loads and loads of white foam.
Want to rule out easy things first before i go tackle an expensive head gasket route.
System is always bled by filling from radiator cap until full, toping up expansion tank whilst engine running with heater set to full.
in past twelve months have fitted new water pump, radiator, thermostate and hoses
