Engine sign comes up on dash board - 1994 Toyota Camry

Don't worry about that you know its low so just put a fresh can or two back in....

sounds like a bad coil pack or ignition module

Usually a sign of a faulty blend door.
The blend doors direct air thru the heater core and out thru the vents.

Wet floors and carpets are usually a sign that the drain tube outside is plugged up. The tube is usually in the engine compartment at the bottom of the firewall where it joins the floor.
If you are saying the air will not come out the floor or defrost you may have a faulty blend door under the dash.

Usually if the battery light comes on when the engine is running, the alternator is not charging the battery.
Have the charging system checked.

Sounds like it might be your catalytic converter is over heating and having a melt down.You may have to replace the converter.

What noise are you referring to. Is it engine noise, or wind noise, or road noise? Is the noise there at cruising speed or just when you are accelerating? Please clarify.

HAVE YOUR FUEL DRAINED AND REFILL WITH FRESH FUEL REPLACE THE FILTERS AT THE SAME TIME

when the glow plug light keeps flashing.Thats telling you that you have a fault with one of the sensors.Take it to a garage and get it checked out with a diagnostic scan.

does it resemble a sideways view of the engine ?if it does ,get the electricals checked .