I did a few things that seem to have helped my old fridge
preform a bit better in hot weather.
Open up the bottom outside vent a little and leave it open.
Added a simple fan to the outside control area that blows up over the coils.
Clean out the stack (don't think that had been done in the first 16 years of the fridges life).
Added foil/bubble insulation all the way around the fridge
Closed off all the small gaps between the main fridge and the rear outside control compartment as well as the cabinets that surround it.
Last but not least and the item I think had the biggest impact. Purchased a good portable cooler for holding the items that satisfy my thirst quenching needs. Resulted in far fewer reasons to keep opening and closing the fridge in warm weather.