Earlier this week, my car overheated while I was driving on the highway. I had it towed to a garage. They looked at it and found that there was air in the system from when the radiator had been installed (4 weeks earlier by a different mechanic). They bled the air and filled it up with fluid and sent me on my way.
As I was driving home, my car started to overheat again- only this time there was also steam coming from under the hood. I pulled over- there was antifreeze dripping from everywhere. I opened the hood and noticed that where my radiator cap should have been there was a plastic with a rubberband wrapped around it (see photo).
I had it towed back to the shop. They told me that- oh yeah- my cap had been missing and that they didn’t have one in stock (yes, this was a dealership). They then diagnosed the problem to be a radiator leak (which they admitted was not there when they had been working on it before). They claim a faulty radiator and think the mechanic who put it in in the first place is responsible.
I am wondering if the fact that they let me drive away with plastic bag and a rubber band in place of a radiator cap could have caused pressure to build in the radiator and thus blowing out a leak somewhere else.