I have a 2009 Aveo5 LT with about 60,000 miles on it. Last year a couple of the radiator hoses needed to get replaced. After replacing the hoses the car was still overheating, so I replaced the thermostat. The car would be fine for a while but sometimes the temp needle would start to creep over the halfway mark. I assumed it was an air bubble. Since this car doesn't have a valve on the cooling system to bleed out any air, I released the air from the system by slowing opening the reservoir cap and allowing the air to escape. I would tighten the cap once I saw antifreeze start to come up. The car ran fan for a while but it started to act up again.
The wife got a new job that's 17 miles away and once she started to drive the car on this longer commute she noticed that the temp needle started to creep up over the half way point again. I figured it was another air bubble and I opened the hood to bleed out the system a so noticed the hose from the radiator to the thermostat houses was swollwen up. When I bled the cooling system the hose would shrink down in size.
Whats the issue here? It it safe to assume that the thermostat is going bad?? Is it just the hose that is going bad and I should replace it before it pops??