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A bit of further info anyone who has air con & dual fans. There are 3 relays in the box between the fans. As you look at it the right hand one is the relay for the left fan, the left hand one is the relay for the right hand fan and the middle one is the change over relay.
If, like me, the relay on the left melts (right fan), just pull it out as a temporary measure. Both fans will still cut in at 97 degrees and run at low speed. If the engine gets to 107 degrees though only the left hand fan will run at full speed. (Prob not a problem for me as there no longer a condenser limiting air flow to the radiator).
Any time the fans run power flows through the left fan & changeover relays so these always need to be in a good state.