I have a three row champion on my hemi and use my windshield washer tank as the recovery tank. When I installed it I also installed a new high flow thermostat that I checked on the stove to see what temperature it opened so I could get an idea on what 180 was on the rallye gauge. So I ran car with cap off to see when opened and checked gauge. Everything was fine until I put cap on at which time it started to get hot. I opened lid on washer tank to add coolant but when I opened the cap it cooled right off. Turns out it was vapor locking the system. Cure I drilled a small hole in top off washer tank no problems in 6 years and no collapsed hoses.
Here’s the cap I use and how the overflow hose goes to bottom of washer tank.