Why do you need to add air to your tires when it gets cold, but you don’t have to release air from your tires when it warms up?
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When it gets cold the air and rubber contracts slightly, so you will typically need to add more.
With a perfect system, you are correct in thinking that means when it warms up again the pressure will increase, and your tyres will end up overinflated.
In reality however, tyres will work over a range of usable pressures, and they will also always leak by a small amount.
This means that when it warms up your tyres will initially be over pressure, but this may not be hugely noticeable – they will still be within the acceptable range for your vehicle.
Over time the air will also leak a little, so at the start of the warmer seasons they will be over pressure, and they will slowly decrease over time to the ideal range, and possibly lower.
Even if you lived somewhere with a constant temperature year round, you will still need to top up your tyres occasionally just due to the slight leakage.
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