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1995 Mercedes Benz S420 heater blows all the time

Tiny
MCKAWOOD
  • MEMBER
  • 1995 MERCEDES BENZ S420
  • V8
  • 2WD
  • AUTOMATIC
  • 13,100 MILES
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.
Wednesday, July 21st, 2010 AT 2:46 PM

5 Replies

Tiny
BLUELIGHTNIN6
  • MECHANIC
  • 16,542 POSTS
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.
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Thursday, July 22nd, 2010 AT 6:40 PM
Tiny
MCKAWOOD
  • MEMBER
  • 3 POSTS
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
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Thursday, July 22nd, 2010 AT 8:05 PM
Tiny
BLUELIGHTNIN6
  • MECHANIC
  • 16,542 POSTS
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.
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Thursday, July 22nd, 2010 AT 8:07 PM
Tiny
MCKAWOOD
  • MEMBER
  • 3 POSTS
Can you tell me where the blend door is?
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Thursday, July 22nd, 2010 AT 11:02 PM
Tiny
BLUELIGHTNIN6
  • MECHANIC
  • 16,542 POSTS
It will be behind the dash, close to middle of dash but slightly to passenger side some.
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Thursday, July 22nd, 2010 AT 11:41 PM

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