My wife has a 2014 Ford Escape with a 2.0 Ecoboost ended up over heating on her and she had it towed to a local mechanic shop.

Their notes: "Engine over heat code present - check coolant level and system is completely empty, fill cooling system and install pressure tester, no coolant leaks found, run engine to operating temperature and noticed coolant bottle bubbling and building pressure of 20 psi. Install combustion gas tester on coolant bottle and instantly turns yellow due to combustion gas in cooling system. Recommend replacing engine."

From their notes my conclusion is that the head gasket needs to be replaced and I don't understand the need to replace the entire engine. The car only has 130,000 KM (80,000 miles) and it has never had any major issues in the past or never skipped a beat for that matter. Any thoughts would be appreciated. Thanks