This seems like it should be a piece of cake but I'm stumped and my knuckles are scraped. Can anyone advise how to remove the two rear hose clamps - the screw heads are 6mm and also slotted, but the way the factory angled them makes screwdriver access and wrench access seem impossible. On the oem part in the car, I have already removed the rubber mounts (they slide out of the semi-circular holes) holding the valve in place. Do these clamps get more accessible once the hot water hose from the overflow tank is unfastened? Thanks.

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87 300e (white/black; amg body kit)
88 300ce (red/cream; amg body kit)
93 300ce cabrio (white/blue/blue top)
93 300ce cabrio (black/grey/black top)
98 ml 320 (totaled @ 137,000 miles)
99 clk320 (black/grey/black top)