Q: Blower motor transistor fins

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Blower fan inop. Replaced blower motor transistor and blower motor per Jay's suggestion. Works now! Thank you! However, I have a small issue with the blower motor transistor fitting back in it's slot. The metal fins on the back of the new one are longer and stick out further than the old one, so when I install the new one back in it's slot, the metal fins hit a plastic wall and I'm not able to screw it in. Knowing that the transistor gets VERY hot, is it an issue if it's resting against a plastic wall?? If not, I might leave it without screws as it seems to be in there pretty snug. Thoughts??

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