SOURCE: radio displays error 7
either the player cannot play the cd (usually happens with computer copied cd's) or you should try any kind of original audio cd that is not copied form a computer and if the problem persist, then take the radio to get checked while it;s still under warranty.
SOURCE: 1989 mercedes 190e blower motor and vents not working properly
Probably two separate problems.
For the blower motor, it may be that the bearings are getting old and so the motor is getting harder to turn and overheating. A way to check is to take the motor out (it will be tucked in behind the glovebox. Pour a tablespoon of motor oil into the vents next to the shaft and work it back and forth to loosen it up. Then put the motor back in and try it. If I'm right, the motor will work normally again. However, this is only temporary--once the oil gets worn off the bearings in a while it will start quitting again. You should order a replacement before it blows your resistor block or (in the worst case) starts a fire. You can get them online, like from autopartswarehouse.com
SOURCE: when I turn on the radio it plays for a couple
That radio is easily removable. check power at the power connections and if they are good, either replace with a new aftermarket unit of your choice (also buy adapter harness and face plate adapter to help with the install) or, get a used radio from any scrapyard.
If you need removal instructions, you can get that in any haynes or chilton manual. (and, you can use the manual to repair other problems as well!!)
Testimonial: "the radio seems to stay on but it wont play through the speakers. there is no sound. it might come on for a few seconds but turns itself down."
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