Aux Heater Fault

[Mechcanico Lee]

With engine off set the aux heater to come on for a 15 min time period , if there is no pump the heater will shut down due to water temp over heat and you may here the pipe work ' thunking/gluging ' due to the aux heater boiling the still water in its own water block .

This is what my car did until i fitted the aux water pump .