I have a 91 ford explorer and the drivers window does not roll down when it's hot outside but is OK when it cools down outside,so if there's anyone out there who help me with this problem please do because I don't know where to start thank you.

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Originally Posted by 7up

i have a 91 ford explorer and the drivers window does not roll down when it's hot outside but is ok when it cools down outside,so if there's anyone out there who help me with this problem please do because i don't know where to start thank you.

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Power windows, yes?
That sounds like the window regulator internal connections are going open when hot.
If that's the case, you'll need to replace the regulator motor.