when does the fan infront of the rad supposed to come on. i put my air con relay into the sub fan slot as there wasnt anything in the sub fan slot and still it doesnt come on. any ideas on what to do now.

I would have thought that you mean the aircon fan? If so then you need to have the heater set to cold and on full blast and give that a go.

 

Ivan

it comes on dependant on coolant temp, vehicle speed & whether the A/C is on or not.

 

the fan has 2 speeds, hi & low, controlled by the fan relay & sub relay.

 

look here for more info

 

HTH :)

how do you test to see is its working? my uncle who has been an auto-electrician for 30 years was foxed by it. we unpluged the ecu temp sensor, put the two wires together and bridged the relays and nothing happened.