Apologies that my first post is a problem! So, picked up my replacement Puma on Friday 1 April (real ironic, right?) no problems with it, runs really well. Have so far driven less than 100 miles since then - mostly work and back (30 miles round trip). Coming home this evening and realised after abour 4 or 5 miles that 1) heater was blowing cold and 2) temp guage was in the red. Now, I have history with this (with 2 Rovers) so within less than 100 yards I pulled over into a car park and called my b-in-law from whom I'd bought the car. Yes, he IS very honest and honourable and came right out to me. He poured a lot of water in, started her up and then water started pouring out. Obviously, couldn't see from where. Anyway, he nursed her home stopping just once - about 5 miles on - to top up. My sister & I were following right behind and from then on, we could see (for a while, then it stopped) water coming out. Managed to get home (about another 5m) without any overheating by switching engine off now and again and coasting. Engine still sounded fine. Put her up on ramps, topped her up, engine on and NOTHING. Not even a drip. Ran it for about 30 minutes off and on, temp guage remaining at the halfway point. We wondered if it was because of the slight incline and dropped down to level. Still nothing. (Now, at this point I'm wondering if it has anything to do with the aircon that I had regassed at Kwikfit two days earlier...) So, still level, we switched the aircon on. No drips still BUT engine started going into the red again, pretty quickly. B-in-law, who knows his stuff, is flummoxed. No leak now, no drips, engine staying cool until that. Any sensible ideas? Car has done about 97k. Cam belt was done less than 10k ago. We don't think it's the HCV.