Introduction
If when you hold down the cool down button and the air is still hot, the spring behind the button may be broken. Another possibility is that the other parts of the button inside the dryer that engage that setting may be broken.
Tools
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Once you have taken the screws out, take the top half of the handle off by lifting it off of the dryer.
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Take out the cool down button and the spring behind it by gently lifting the button up toward you and pushing it to the right out of its groove.
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Conclusion
To reassemble your device, follow these instructions in reverse order.