Heaters not working

[real]

Hi,

The heaters in my golf mk3 are not working properly. It will only go very slightly warm. Even though I give it more than enough time to warm up. Any ideas as what could be the problem, and how much it would cost to sort out?

Thanks

 

[real]

Heater matrix? Whats that? How much to fix?

I havent used anything. Whether the previous owner did I dont know, as it wasnt working when I bought it.

Thanks

 

[real]

Coolant loss?

There is a leak somewhere in the water tank. I have to fill it up every couple of days. It is somehow escaping from the sides of the tank. Is this connected to the heater problem?

Thanks