Russ 6334 Posted September 3, 2018 Share Posted September 3, 2018 Hi all my mondeo has always been poor on fuel based on my last heavier estate always returned 56mpg doing short journeys always cold on 30mph roads i now have a low mileage 70k hatchback same age that I religiously drive at 57mph 80 miles a day to work and back and it returns 47mpg! ive noticed that the temp gauge is all over the place and never really gets warm. I just took it out and hammered it for 2-3 miles at 50mph in 3rd gear and once the temp gauge hit the middle I measured the temp with an infra red gun. rad hose from rad to stat was 75 post stat to heater matrix was 55 oil stat hose was 75 header tank was 34 rad was 65 then I drove home in 4/5th around 30mph and when I got home temp gauge was back to the zero on 60 measured same things again rad hose from rad to stay was 73 post stat to heater matrix was 65 oil stat hose was 65 header tank 32 rad 66 and to make it easier to read 75-73 55-65 75-65 34-32 65-66 the car gauge is always on cold on the motorway, the minute you hammer it or reach an incline it starts to creep up but soon goes straight back down again ac is never on. have changed the oil stat today and no difference the heater kicks out really hot air what the hell is going on? Quote Link to comment Share on other sites More sharing options...
pragmatix Posted September 3, 2018 Share Posted September 3, 2018 Temp sender? Quote Link to comment Share on other sites More sharing options...
Russ 6334 Posted September 3, 2018 Author Share Posted September 3, 2018 33 minutes ago, Russ 6334 said: Possibly but where is it? And why would it fluctuate like this when the physical temps aren’t? Quote Link to comment Share on other sites More sharing options...
thanuttiscotsman Posted September 16, 2018 Share Posted September 16, 2018 Running cold on the motorway and constant low temperatures. This sounds like a coolant thermostat stuck open to me. Heating probably will be warm as the hose usually comes straight out the engine to the matrix. I have a mk3 petrol and I know the thermostats on them are a common problem but not sure if the diesels are the same. 1 Quote Link to comment Share on other sites More sharing options...
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