How did the car run last summer? Did it have the same problems in the same kind of weather?

I recently chased overheating problems in my SL. Not a W124 and not a M103, but perhaps some of the same things apply here.

To make a long story very short, my issues were 2-fold:

1: Still had the original thermostat in it, MB logoed and everything. Unbelievable it made it 35 years, but it did. Original thermostat was still working, but would not open fully and would cause overheating (>100˚ temps) on a warm day, anything over 90˚F outside.

2: After replacing thermostat, car ran significantly cooler when moving but would still have temps creeping up in traffic or when idling in gear. Fan clutch passed the "shred a newspaper" test, but was replaced anyway as being suspect. With new clutch, heating problems disappeared immediately. It also makes a noticeable noise when the clutch engages and the engine is revved. I only bring it up because it may seem like the clutch is working properly but could still be slipping enough to reduce cooling capacity.

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Current stable:
1995 E320 157K (Nancy)
1983 500SL 125K (SLoL)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)

Gone and wanting to forget:
1985 524TD 167K (TotalDumpster™) [Definitely NOT a Benz]