Yesterday in Spit 1500 I was held up for about 35 mins in heavy traffic. Temp gauge never went above normal but when I eventually started to move the car ran like a pig. I suspect the under bonnet electric pump had got too hot.
I also fitted another pump in the boot for back up, so switched over to that one via swith on dash and instantly started running normally. I think this is one of the mods that payed off.
Danny