engine should be ok as its not got mega hot
you can always change your rad fan switch to a lower temp one if you need. you running a m22x1.5 threaded one? ford colour coded the plastic bit on the plug for temp ranges if you have a 2 round pin one with a round plug
or have a look though a intermotor catalouge most rad fan switches start500xx or 51xx
http://www.intermotor.co.uk/?p=smpeu...and=intermotor to find one to suit usualy £4-5 from a auto factors
i have a s/h ford orange plug one here you can have (on@92 off@87) if your in exeter @ anytime