No need to remove the radiator, but it is handy to remove the upper radiator hose. Some of those 10mm bolts are tough to get to. Have an assortment of 10mm wrenches and sockets available when you do this job.

SteveM.

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'93 190E/D 2.5 Turbodiesel 5-speed (daily driver)
'87 190D 2.5 Turbo rustbucket - parts car
'84 Dodge Rampage diesel - Land Speed Record Holder
'13 Ram 2500 Diesel
'05 Toyota 4Runner