Hi thanks for that mark.Have checked wiring to both icm and lh2.4 unit-all good.Have replaced sensor and connector for good bosch replacments,no difference.Have disconnected ac switchs as these can also activate cooling fans.Still drawing a blank......car very poor start cold/fans activate almost immediately like as said before suspect thinks it hot.When engine warmed up runs o.k....Only code that ever reoccurs is coolant sensor.....any ideas....ecu had it......Nigel.