Problems with 2, 240sx's. One wiring, one engine.

[s13_chris]

Well my 240, I'm sick of after work having to drive home and my rear window be COMPLETELY fogged. I dont know where to begin looking for connections. Where is the defroster unit? Where is the wiring harness? I'll check for connections. Any troubleshooting tips for it? It just plain doesn't work. And tell me if I'm wrong, but it should work when I press on the defroster switch on the right side of the steering wheel just below hazards.

2nd Problem- its my friends 240sx. We did a basic tune up, and it now starts well. But there was a good amount of whitish/slightly blue smoke coming out. So we took off the exhaust. We left the manifold but we took it off from the cat and back. So no pipe besides under the car. (Sounds horrible but its funny revving it at people next to you). But we checked and cleaned the MAF sensor, replaced the O2 sensor (tip was broke). The spark plugs, when pulled out, smell really fuely too if this helps. (car wasn't active for the least of 1-2years; sat in a backyard). So what do you suggest replacing.

The 2nd problem isn't priority right now because we really can't get to it since its locked up in Autoshop at my HS and its X-mas break. My 240 is accessible and I need a defroster. Can't see out my rear window after work.. Not fun when you want to change lanes. Thanks ahead of time! Merry X-mas everyone!