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ac and heat dont work on my 1996 Mercedes C280 on 1996 Mercedes-Benz C280

My ac and heat does not come out , it comes on and i see the temp reading but nothing comes out.fan not blowing. someone said i can tap on the blower motor, but i'm not sure where that is located. Took it to auto zone they checked the fuses and the were all good. Is there a relay that i can reset.Also my gas guage does not work unless i go over a speed bump or when i first crank the car up then it goes back to empty. i set the miles now and try not to go over 200 miles per full tank. how can i fix this, what kinda gas should i be using.

Asked by for the 1996 Mercedes-Benz C280
really need to have the Climate Control Computer scanned and a parts store mini-scanner is not robust enough for this type of scan, need a German car scanner capable of reading the Climate Control Computer data. Same with the fuel gauge problem, need to scan the Instrument Panel.
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really need to have the Climate Control Computer scanned and a parts store mini-scanner is not robust enough for this type of scan, need a German car scanner capable of reading the Climate Control Computer data. Same with the fuel gauge problem, need to scan the Instrument Panel.
where is the ac blower located
Blower motor is located under your glove department. Same thing happened to me.