306dt Cooling fan relays

[kevin]

Over the past few days I have noticed the engine temperature fluctuating more the usual. When I checked the fans, both were not working. The relay's at the front of the car were corroded. How difficult are these to replace as I intend to change the complete relay box

[andycarter]

The relays are easy to replace, replacing the entire box is obviously a bigger job.
I think the relay box can be detached fairly easily and this may give you enough room to examine, clean and renew any corroded spade connectors without resorting to stripping all the wiring out.