 seasonal temperatures like in the fall and the spring where it's only in the 70s maybe the 80s but we get some relief and they can kind of still do that heat exchanging that they're supposed to do fairly efficiently but when we get up into these sustained 90s that extra 20 degrees is just a lot is a bit more wear and tear and just it's more taxing on these cooling systems so their job is to remove heat from the system so the engine runs coolly or so the air conditioning runs correctly