10A A/C fuse blowing when A/c Defrog is turned on

[Devilman]

hello everyone!
Had a problem with overheating.fans were not coming on.after diags etc...duh...10a fuse/ac wasnt even present...put one in...fans working fine no overheating...BUT...now when I go to use the AC/defrost/fog...BOOM the 10a/ac fuse blows..immediately. possibilities? suggestions? I did notice some "grease" (grayish white) in the 10a/AC/FWD spots (specifically) AND in the 25A fan spots on the top left of the engine bay fuse box...this grease is present ONLY in those 2 areas...meaning it was put there I guess...any insights for fixes? (very annoying and actually kind of dangerous without the ac/defogger in the rain and the windows fog up)
I had heard that the compressor will "shutt of" automatically if their is not enough refrig in the system or if it is completely out(to prevent any damage to the compressor). when it shuts down...could this be via the fuse blowing to prevent use? I thought that was kind of extreme...but just a thought

Any help or info would be extremely helpful!

Thanks in advance!!

-Matt-