When I changed my heater hoses and control valve recently (1994 940GL) I borrowed a couple of painters trestles and a large painters plank from a friend.
With the bonnet (hood) opened to the fully vertical position (adjust those catches on the hinges to allow full vertical opening) it was a really easy job to lie on the plank and reach down with tools to undo the hoses. One of those flexible screwdrivers with a 1/4" square drive on the end and a variety of sockets is really useful for loosening and tightening hose clamps. (They're sometimes called a hose clamp tool) IPD sell them on their US website, plus lots of places that sell automotive tools.
John Marshall
1994 940GL
Christchurch NZ
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