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I read somewhere on this site, I can't it again that you have to remove the radiator to replace the fan belt on the 508d is this correct?

Regards-------Kim

No, you can do the change the belt(s) without removing the radiator.
Be aware that the alternator can be hard to unscrube.
Regards Hugo

but with removing the radiator, 4 grille bolts, 4 radiator bolts, the job is much easier in my opinion:)

as a fact , the adjustable strud on the alternator always plays tricks, it's a bugger to make it work , but when in good condition one can actually re adjust the tension on it , the actual nut is a bush and it travels over a 10 millimeter rod that bolts to the engineblock . to adjust you have to undo the top bolt on the alternator to free the adjuster bush .
it's only a reasonable job if the adjuster is in 100% state of maintenance, in all other cases the radiator out is much more easy. the adjuster needs a good clean in 9 out of ten cases ......

Thank you all for the replies and the useful information, I will remove the radiator and clean everything up.
Regards------Kim