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

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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.
(3) Answers
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.