Brief history of the car: Bought in 2003, my cousin had it for about 10 years and put 80k miles on it, sold it to my brother after it needed an alternator replacement, he had a friend replace the alternator but he wasn't sure it was actually fixed because the check engine light never turned off. My brother drove it like that for a while then things went downhill about a year and a half ago when his car was broken into and his keys were stolen, he took out all of the fuses (I don't know why he didn't just take one important fuse out) so that the car couldn't be stolen, again, I'm not sure why he didn't just have it towed. Moving past my brothers decisions, he had the key replaced and we tried to put the fuses in, but ever since then, and I'm assuming here because I wasn't driving it at the time, the radiator fan was running at full speed all the time. So we haven't used it since then and have been trying to troubleshoot the problem, but in the end I took ownership of the car, and I'd like to just fix it and get rid of it.

The problem is the radiator fan is running full speed all the time, from what I've read online it seems to be because of a bad mass airflow sensor, ecm, or possibly because of a voltage issue, or possibly from a missing fuse, a fuse diagram would be great but I can't seem to find one. I got four OBD codes which came out as:

P0620 - Generator Control Circuit

P0304 - Cylinder 4 Misfire Detected

P0410 - Secondary Air Infection System Malfunction

P0237 - Turbo/Super Boost Sensor A Circuit Low Input


List of things I think may need to be possibly fixed:

Replace alternator
Replace MAS
Recall 2008020002 (no longer available)


I bought a new battery and tested the alternator by checking the voltage while running, and it was at 14.2, which seems to rule problems with the alternator out, but I'm really not sure.

I don't have much spare time to sink into trying to fix the car. If anyone can point me in the right direction that would be awesome.

EDIT: Oh, and if it is the MAS, any suggestions on where to get parts would also help a lot.