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I drove the car today that I replaced the transmission on (09 G5 auto). It was throwing codes but ended up replacing the EXH fuse and that took care of the codes.

However the coolant fan wouldn't kick on. I swapped relays with the same one right in front of it. CRNK I believe? When I did that the car started and ran horrible but the fan's kicked on. Swapped the back, fans didn't work but ran fine.

So I decided to swap the fan relay with the rear defroster. Car runs fine and the fan kicks on now. However, it keeps blowing the EXH fuse. Every time the key is turned on it blows this fuse. I tried removing the relay's and it's still blowing. I'm horrible at electrical stuff so I'm not sure what to check now.

Also, what does this fuse control? Looks mostly like the heaters for the O2's, but is the car ok to drive like this?
 

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The EXH fuse stands for exhaust fuse. It supplies the voltage to the HO² sensors and a few other like MAP and cam sensors, so you must have a pinched wire or chafed wire touching the engine somewhere.

---------- Post added at 11:20 PM ---------- Previous post was at 11:19 PM ----------

Check for a wire squeezed between engine and transmission maybe.
 
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