Forgive me if I'm missing something.
What's there for soffit vents?
All I see is a tiny gable vent no ridge venting which would vent the whole roof.
There should have been 5/8" fire code sheet rock in that garage and insulation in that wall all the way from the floor to the roof line where it meets an occupied space.
That garage roof needs a ridge vent but my guess that has little to do with the house getting hot.
Far more likely lack of air sealing in the attic, not enough insulation, lack of ventilation.
What's there for soffit vents?
All I see is a tiny gable vent no ridge venting which would vent the whole roof.
There should have been 5/8" fire code sheet rock in that garage and insulation in that wall all the way from the floor to the roof line where it meets an occupied space.
That garage roof needs a ridge vent but my guess that has little to do with the house getting hot.
Far more likely lack of air sealing in the attic, not enough insulation, lack of ventilation.