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if you have cooling then the fuse is not blown in the air handler. If fuse were blown nothing would work except maybe a nonstop blower.
The air handler will have 2 doors....one where freon pipes enter...and the other a solid panel. Follow wiring into unit and that is the door to remove if you wish to.
When cooling does outdoor unit run?
I apologize...your response came a hour and a half after later and i had signed off.
I do not see value in finding the fuse as it would not cool if fuse was blown.
Now, if it cools but does not heat....would likely be a defrost board issue in the outdoor unit. Would you be replacing this yourself?