Quote:
Originally Posted by 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 .
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You are right, mine used to do do exactly that - you could hear gurgling and it would shut off and throw an overtemp code. I did some additional adaptations and now it heats the car. Even on a frosty morning it will melt the ice on the front and side windows and when you get in the car it feels warm like it was just driven and the side face vents are blowing hot air (nothing out the centres).
I will check the values and paste back in this thread. IIRC there is a residual heater pump in near the heater matrix that circulates the coolant well enough but it is not activated just by coding.