2010 C4 Grand Picasso Heating problem

[freecak]

Good evening

I am having a problem with the heater in my 2010 Citroen C4 Grand Picasso.

When i start driving the heater remains cold for at least 20 minutes. It will then throw out some warm air but if I turn the fan up to full or continue driving the warm air stops and starts getting cooler.

Almost as if there is a charge of hot air and it has been exhausted.

Any thoughts?

Thanks for reading

[mickthemaverick]

That description suggests a lack of coolant in the system. As a first check I would ensure the coolant level is correct and you have no air trapped in the system. Then bring the engine up to temperature and feel the bottom hose, top hose and heater hoses. They should all be hot, the heater feed hotter than the return. If not you may have a blockage in the heater matrix which you may be able to clear by back flushing it. Good Luck