Escort 1.8 Zetec 16v 1997

Been having a lot of problems trying to sort my slow rad fan speed working
Its a 1 fan 2 speed
low speed for when engine getting hot
high speed A/C

High speed works no problem
changed the 3 sensor switches
ECT engine coolant temp
ETS engine temp sensor/reader
Rad switch

also have changed to big green relay behind the battery

Took it to a snap on reader:
It read the ECT temp going up/down with high speed on off
it read ECT as have high volts ....????

stuck now...?