Interior Heater works every now and then

[forestboi22]

hey all im getting some problems with my interior heater sometimes it works then other times it dont ive checked all the fuses but i am stumped as i dont know what else to check as i dont know what im doing on cars lol so any advice will be appriciated

[xDaNx]

I have exactly the same problem whenever i use the rear demister, stopped using it and the heaters been working fine for about a week now :wacko: