I've had a 1994 E320 Wagon for about twelve days. It had a clean Carfax report, and I got it for a good deal. I got from Kansas City, MO to Fargo, ND for college without a hitch.

Now, I've got three "idiot lights" ablaze. One of them, the coolant level indicator, goes off and on depending on the time of day or Geraldo Rivera's mood. The first day I drove it home, the excess coolant hose popped off and the car was squirting coolant all over the driveway.

My infernal Check Engine light is on now, and I checked a few rudimentary things to help eliminate a few causes. The Oil is golden, the air filter is clean, and there isn't very much play on the serpentine belt. What could be the cause? I know that if one left the key in the ignition while filling the tank, the car can get a bad read on the fuel level. I think I did that while on the way up once. I filled it up with Premium in hopes of resetting the sensor, but the gas pump stopped and the needle doesn't go over 3/4. Is this the source of my check engine light? And how might I remedy these problems?

The other seems to look like a light bulb, but I'm not sure what it is, as I don't have the owner's manual. It's between the wiper fluid light and the SRS light. If it's a light bulb I can most likely fix myself.

Also, there's a hissing sound coming from underneath the rear of the car when it's running. It sounds similar to an air compressor. What could be the cause of it? Would it have anything to do with the rear suspension?

Thanks,
Chris