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Hi, I'm a new member. I have a 1999 Focus 1.8 TDdi which has done 99'000 miles. I have had a lot of work done on it and it runs like a new car but recently I've noticed the temperature gauge isn't going up as far. The heater is luke warm. Under harsh acceleration the gauge seems to go up to halfway but when I take my foot off or slow down it drops to about 1/4 of the way up. Could this be the thermostat stuck open?? Thanks for any advice or help anyone can offer..... Robert