So it was running fine for a while, then it started to idle poorly and wouldn’t rev as fast as it normally did. After turning the engine off, it wouldn’t start the next time. Is that right?
If so, when it didn’t start, what exactly happened when you turned the key to “start”? Did you hear that rrr rrr rrr sound, but it wouldn’t catch and run on its own? Or did it make a click, but no rrr rrr rrr sound. Or did it make no sound at all when you turned the key to “start”? The
If it was either of the last two, which mechanics term a “fails to crank”, that sounds like you have a battery, alternator, or starter motor problem. It may be that running the fan all the time is confusing the charging system. Those radiator fans take a lot of current, and may be stressing the alternator or the battery. Then when it comes time to start the engine, you’ve got a partially discharged battery and it won’t crank.
If I had this problem I 'd do a compression test, and if that was ok I’d fix the fan switch so the fan only came on when it should, and fix the two leaks before proceeding further. Otherwise you’re going to be fighting too many problems at once.
If the oil temp was only getting to 60 deg C, that doesn’t sound like much of an overheating problem. But I suppose it is possible for an engine coolant to overheat but the oil temperature not showing that. Does your Alpha have a coolant temp gauge on the dashboard? Or just an overheating warning light?
As long as the engine didn’t overheat and got damaged, it seems like you aren’t that far away from a daily driver there OP. You want to do the best you can while getting things working to avoid overheating or running low on engine oil, transmission fluid, or coolant. Keep those fluid levels and temperature well monitored until everything is verified to be working correctly.