focus 1.4 2000 reg. Have posted overheating problem previously but no further forward. Can anyone point me in some diagnostic direction please???
Car runs at 92/94 degress C at idle for ever. If revved up and when temperature then reaches 100C, fan cuts in. On checking under bonnet top radiator hose hot and bottom hose cold and coolant in expasin tank barely warm. When taken out on road and under acceleration temperature quickly goes up to 124C (I think this might be the max reading on onboard diagnostics?) Then when coasting quickly drops back down only to to quickly go back up on further acceleration. If continuing at this temperature exclamation light comes on followed by engine light and car goes into "failsafe mode". .

To-date cht sensor replaced, thermostat replaced, new water pump and new radiator, plus coolant has been changed twice. Hoping not cylinder head gasket failure. No water in oil, no oil in water, no coolant leak, no white or blue smoke from exhaust. Had compression test which showed normal pressure in three out of four cylinders but reduced pressure in one but engine not misfiring and no loss of power, etc. Wondering if it could be airlock and if so have tried to bleed by running up to temperature with expansion cap off. Any ideas gratefully accepted.