please could any1 tell me why my mrs fiesta zetec 1.25 is still overheating after we changed the thermostat yesterday? the temp guage is all over the shop whilst driving.

 

Is it actualy overheating or are you just going by what the gauge says ?, if it was still overheating ie boiling the coolant in the expansion tank with a new stat I'd be looking at water pump circulation, or if it is using coolant maybe HG.
In short if there is no coolant use, or steam etc eminating from the engine most likely a dicky gauge or sender/wire to it.
tabetha

 

i would say heater control valve on the bulk head with two pipes going to it common as day on them m8 i would change that