My car's heater only blows cold air - is a split expansion tank the likely cause?

I took my 2006 Ford Fiesta ST to a local garage as the heater only blows cold air. They've told me the expansion tank has split. They have the part on order but tell me it's going to be over £80, plus...

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...

Ford Fiesta (2002 - 2008)

Good handling and comfortable ride. Tidy design. Reasonably spacious. Plenty of choice second-hand. Good reputation for reliability.