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1986 Mercedes Benz 560sel Heat comes inside when running

Tiny
GIANCARLOPUP1
  • MEMBER
  • 1986 MERCEDES BENZ 560SEL
  • 5.6L
  • V8
  • RWD
  • AUTOMATIC
Despite having all of the settings to heater control, etc, when driving the car, it begins to have heat come in. Any suggestions, easy fixes?
Sunday, March 8th, 2015 AT 3:26 PM

5 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
If you have the heat turned off but still feel heat enter the vehicle, the blend air door must not be closing fully. It is under the dash on the heater core box. Not an easy fix.
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Sunday, March 8th, 2015 AT 9:21 PM
Tiny
GIANCARLOPUP1
  • MEMBER
  • 3 POSTS
Thank you.
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Sunday, March 8th, 2015 AT 9:54 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Happy to help.
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Monday, March 9th, 2015 AT 6:58 PM
Tiny
GIANCARLOPUP1
  • MEMBER
  • 3 POSTS
The heat tries to come in through all the vents, so I shut them off. However, it still comes through the bottom and defrost vent, which I supposed can be taped but probably not the bottom, right?

How do I get to the part you mentioned? What tools do I need? What parts to purchase?

Someone suggested bypassing the heating system and adding a third hose to link the two hoses under the hose which supposedly circulate the heat to the inside of the car but also cool off the radiator, so that if I would just splice the two hoses the auto would over-heat? Do you agree? I don't even know how to remove those two hoses. Even if I did, what size hose to by, how to connect the two to the new one. If it's supposed to be the same size hose, then I suppose that I could measure the ones I have and use black electrical tape to keep all together. But still the issue of removing the hoses from the part that seems to be only detachable from the inside.

Thanks and will accept any response at your convenience.
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Thursday, March 19th, 2015 AT 10:05 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
First, the blend air door isn't easy to get to. It is under the dash and part of the heater box. Much of the dash needs removed.

As far as bypassing the heater core, I don't like the idea because you lose heat in the vehicle which in turn, will have an affect on the defroster working properly. No, it won't cause the engine to over heat, but it will cause other issues for you.
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Saturday, March 21st, 2015 AT 9:56 PM

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