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Re: fuel gauge chime
I suggest that you did not disconnect the warning buzzer. The reason why the buzzer goes off is not because you are getting low on fuel, but fuel is what keeps the fuel pump cool and keeps it from burning up. I'd keep in connected because it's cheaper to add fuel than replace a fuel pump.
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A mechanic would check for voltage from the gauge at the sending unit connector at the tank. The sending unit grounds the gauge on the dash. Not sure what the humming noise is, the computer controls the gas tank venting by a solenoid and the vapor canister.
It does not use Freon it uses 134a and it depends on condition of compressor and how much is in it. I would go to Auto parts store and buy 2 cans of 134a with the gauges on them if you read the can or the gauge it shows you when it is full. Make sure you connect to the Low side of connection.
Warning first...always work on radiator when temperature is low to reduce chance of extreme burn. That being said,
Look on the bottom of the radiator for a "pitcock" valve. It will look like a big wingnut. Turn it counterclockwise to open the valve and the radiator will drain.
If for some strange reason there is no valve on the bottom of the radiator, disconnect the lower radiator hose to drain.
Are you trying to say that the light that illuminates the temp gauage and the speedometer gauge don't come on? If so you need to replace the bulbs from behind the instrument cluster. If help needed reply on this post.