1995 Mercedes Benz S420 heater blows all the time

1995 MERCEDES BENZ S420
13,100 MILES • V8 • 2WD • AUTOMATIC
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MCKAWOOD
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when ever i turn on the a/c the heater blows at the same time. more so out the sides and defroster, I'm getting a little out of the center vents but it's not very cold.
Jul 21, 2010 at 2:46 PM
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BLUELIGHTNIN6
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Hello and thanks for donating


Are you certain that it is the heater that is working or perhaps just that the A/C is not cooling the air so it is blowing in warm outside air? You may need to check the refrigerant level of the A/C system to see if it is low.
Jul 22, 2010 at 6:40 PM
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MCKAWOOD
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no. it blows cold out the middle and back vents, super hot out the left dash vent, warm out the right vent and depending on what setting hot out the defroster
Jul 22, 2010 at 8:05 PM
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BLUELIGHTNIN6
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Okay, there must be an issue with the temperature blend door behind the dash. May need to remove some instrument paneling to access the blend door and inspect it carefully to ensure it is operating properly.
Jul 22, 2010 at 8:07 PM
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MCKAWOOD
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can you tell me where the blend door is ?
Jul 22, 2010 at 11:02 PM
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BLUELIGHTNIN6
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it will be behind the dash, close to middle of dash but slightly to passenger side some.
Jul 22, 2010 at 11:41 PM