had some issues with our 1600 mk1 focus , overheat lights came on the dash and we got recovered home , ive checked the waterpump impeller, stat, fluched the rad , cleared a small blockage on one the small bleeder hoses , new coolant and cap

driven the car alot and keep stopping , at no point does the hoses /rad feel too hot

gauge shoots from normal to hot and back again in around 10 seconds , seems to happen mostly when going from 70 ish and backing off to 50 , i think its too fast to be a genuine overheat

fan comes on randomly even at speed

i got the machine hooked up and cylinder temp is showing 114 after a long run , hoses felt normal , no fan on , im told fan should come on at 105

does it sound like a duff cylinder head temp sender??

basicly its thinking its hot and its not?

 

ordered a sensor to try ....anyone know the spec for the torque? haynes /googgle say differnet things

 

23nm ?