Hi Dave Jones @davejones
Not worked on aircon myself though one of my fans is a little noisy so maybe I should.
Had a look in the Jag manuals and the fuse for “Airconditioning Motors” is in the Main Fuse Box near steering wheel on RHD cars. Fuse No 10 and it’s a 10Amp.
Aircon Blower relay seems to be inside side panel of centre console as per Jag workshop manual pic/discription below. Im not familiar so cannot confirm if just the one relay – obviously two motors though.
I believe both are correct for 1985 & 1987 versions of the aircon. (FYI there is also a thermal fuse under bonnet on front of RH wing valance according to book but not sure if for blower motors or not)