Why is my car overheating?

Hello, Dave here, contributing to RepairPal and providing expert advice since 2010. Your question and information seems to indicate that "everything" has been checked and repaired or replaced. But the problem is – something is missing. Coolant should really never boil. The temperature should never get that high. Have you insured all air pockets have been purged from the cooling system? That would perceptively be "boiling". If the Reservoir becomes more fool it would seem to be due to back pressure from exhaust gases. I know you said that this has been resolved but it doesn't seem like it's working like it should. Something has been missed and I strongly recommend professional help be engaged to figure out what's going on. Did you have a shop repair all of this work? They should be working with you to resolve your concern at this point. If not, consult a shop near you. https://repairpal.com/auto-repair-near-me Click the link or call us at 877-913-1554. We'll gladly find you a certified RepairPal shop in your area.