The heater doesn't clear the windows

I have a 51 plate Astra 1.6. The problem is all the windows steam up after 10 mins. The heater is working on all speeds and all the vents are blowing hot air OK, but the windows are still not clearing...

Why isn't my heater working?

The heater in my Renault Scenic has stopping working. I've checked the fuse, but it's working fine. Any suggestions?

The heating has stopped working in my Mazda CX-5 - is there a solution?

My Mazda CX-5 heating matrix has stopped working, which is quite chilly in winter. I've seen various messages that Mazda are aware of this issue, I was just wondering if you had any advice as to possible...