When I did my conversiom on my fiesta mk4 I added the 2litre ecu and engine bay loom from the mondeo but the fan side of things was all messed up.So I want to go this way in adding a fan relay so every thing is fine again instead of using a fan on a switch.On the 2 litre blacktop thermostat housing is the fan switch on top of the housing or on the bottom and with my mondeo loom not having the original fan set up it wouldn't cause fuel problems would it like over fueling or running lean or run weird would it?