Door closer end phase and backswing behavior changes with weather :/ : Locksmith

I’m still a pretty new locksmith and want to help out a local restaurant. They’ve got a door the closer seems to work great in the summer, but in the winter it almost works, and it’s got a little bounce. I want to help them out, but not sure wtf is going on. I thought it was just an adjustment, but the owner said it works fine when the weather is warm. That really confused me.

Anyone seen anything like that before? I’m up near Portland Oregon if that helps with the weather variation 🙂

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