Replaced almost every heater component. Cab is blistering hot now

[special-K]

Originally Posted by Mister-B

Unless the aftermarket blower draws more power, because it is bigger (which it is), or is more powerful (which it very well may be, where it blows harder).
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You never mentioned the motor you put in was anything different. The point is really quite simple. Put the fuse of proper amperage for whatever blower you are using. My explanation was based on OEM. If you checked and know your replacement requires a 25a fuse you are fine.

If you do have a 10a fuse in the next one down (radio),you better change that back to a 3a,as required.