Hi,

Got another small problem with my S1, it never seems to get up to temperature, heaters are always cold too. Car has had new thermostat which has been tested ok, new radiator and coolant hoses. The hoses that go the heater matrix always stay cold, although the hoses that go the header tank and rad do warm up eventually if I let it idle for 15mins or so but as soon I start moving again it drops right back down. Gauge never goes over 1/4 of the way up and when moving drops back under the range.

I'm running cosworth managment and because the water temps are so cold the ECU is chucking in loads of fuel thinking its colder than it is, it's costing me loads in fuel and the back end is covered in soot from the unburnt fuel.

It used to be fine, then one day I topped it up with water now its doing this, any ideas?

Thanks