A mate at work has a 1.9 Diesel signum, he has this problem where on the way home from work it went into the red after a couple of miles. He stopped the car to let it cool, then after a couple of miles it did the same. Also when he puts the heater on to hot there is only cold air coming out. Any of you 1.9 diesels owners had this problem, or does anyony have any pointers for him to look at. Cheers Lads.