i recently bought a 2.0 GLX galaxy 1996 petrol. Ive recently fixed a stalling problem by replacing the Idle control valve (AKA Air bypass valve) but also have a problem with my temperature gauge. i fitted a new sender unit today as i thought that was the problem, now the gauge is working but only reading a low temperature, about 1/4 right at the low end of normal when running, but if i stop in traffic for a few min's it will go to half way up or just over but then when i start driving again it works its way back to low normal reading. is this correct? i would assume it should sit happily about half way, what else do you suggest i check? coolant is circulating as the heating is working so i'm guessing there is no blockages in the cooling system, possibly a stick thermostat? any ideas ??