Weird bunch of events after an oil change....I've had an overheating problem for about a month, did the oil and figured that would do it. It didn't, but I discovered that the fans weren't turning on and thermostat was bad so I changed that and the coolant temp sensor just in case. Started it, and now the water pump is spraying, and the fans still aren't turning on unless I run the AC. Going to replace the water pump soon, but what could be making the fans not work? Could it be a fuse issue?

It could be the fan relay(s).

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95 SLE... a keeper. 241k miles. Low and Slow.
97 BMW 528i
98 Infiniti vq35'd i30: 13.3@104mph, 30MPG Hwy (RIP)
02 Jag X-type
03 BMW M5
05 Chevy Cobalt LS
07 Infiniti G35s 6MT (Sold)
07 Ducati Monster S2R 800 with DS1000 swap
83 Yamaha IT175K
72 Yamaha DS7: '74 RD250 swap, JL chambers

Info on dropping a 92-99: Here.

OMG, thank you for the diagram! Will check this out and report back....