Got into my Rover this morning and started it up. Got over it's usual initial lumpiness and settled down to a fast idle while I scraped the ice from the windows. The car ran for approximately ten to fifteen minutes and I was ready to go when I noticed the windscreen wasn't clearing and that the heater was blowing cold air. I then also noticed the temp gauge only a couple of mil from the top of the scale so I switched off sharpish and took my other car to work.
I did not hear the cooling fan, which has worked in the past. I also find it really weird as the car had just run approx 75 miles on Tuesday on and off without a hitch and with a warm heater. I also checked the water level on the Tuesday evening and it appeared normal although there was a lot of "glug, glug" noises as I freed the pressure cap on the expansion tank.
I know without having checked water levels and things it doesn't make diagnosis easy, but does anyone have a clue?