I have a 2000 Nissan Altima. During the fall it

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Not really. That is good stuff for pin or small holes. Once the seams come apart you need it re soldered. Now if this seam is very small in leakage....very very small it might get you by for a few days. Copper coat stop leak works the best.

first check the oil level... you could have a bad oil pressure switch or low oil pressure caused by a failing oil pump...

I also own a 2000 Altima and have had this problem. All I can say is you need to replace the window motor. They can go for as low as $50 dollars, but try to get them from your dealership or place of auto repair. I've seen some people try to sell them on the internet for that cheap, but they're either used or lied about. You're better off getting it from an official source.
I had this problem and it does ****. Nobody enjoys spending money on repairs Even with the part, you have to pay labor so you might be looking at a $150-200 dollar job. That's just the way it goes these days.
All I can say is depending on where you live makes the difference. I know for a fact, the cause of my problem was because of winter weather and cold. When you have your window freeze up from ice or snow, try not to put the window down. It will only strain and weaken the motor until it eventually fails. Also, over years of that kind of abuse (in my case), it will eventually add up. That's the best advice I can give you regarding your problem. Good luck to you.

This is normal conditions anything that uses forced air heat or cold there is ambient air in the duct work that must be purged out before the heated or cooled air flows.

you may have a sticking thermostat make sure you have enough anti-freeze in it and it does not have a air bubble in it give these websites a try www.alldatadiy.com and www.autozone.com if all fails stop by your local library and get your hands on a Haynes auto repair manual for your car wish you the best of luck Michigan Man.

thermostat might be stuck open need to replace it ..just went through that with my car

Check coolant level, make sure it's at the proper fill mark when cold.
Partially blocked heater core - back flush cooling system
Defective heat control valve.
Hope this helps.

you can take a little time but you should definitely replace it soon if you have cold weather where you live.

Engines need to be warmed up by the coolant in the winter time.

What is the actual code? I have a feeling you are misinterpreting the code.