The heaters in my Leon Cupra 280 seem to take quite some time to get hot. It takes in excess of 10 mins for any heat to show and probably excess of 15 mins to get to full heat. In the meantime, if it starts getting warm and I whack up the flow and heat, it gets colder again. I do have a coolant leak “suggestive of water pump” according to garage when I had previous work done and am looking to get this sorted. I’ve had the car since April and haven’t noticed any improvement or deterioration. Is it likely that this is related to the coolant leak? I can’t think of much else since it will reach full temp but only when the engine is at proper operating temps. The AC works perfect for cold settings.