Mines on the blink, and going up to Dundee tomorrow so its bound to be cold up there 
, its got power to the blower as the relay inside can be heard to click when turning it on, but nothing happens. Last time it was working was one day back in the hot summer (remember when that was 
) when I turned it on by mistake, and returned to the cab and it was [zebbidy] hot in there, I wondered if there was a themal cut out that could have been triggered 
try looking on the heater for a rubber gromet
which if you push down on it,resets the cut
out switch, also check that the inlet/outlet
points are freeof dirt,fluff etc etc,