climate control issues
Thread Starter
Newbie
Joined: Apr 2004
Posts: 3
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climate control issues
1989 560 sel-gas 171.600 miles.
I am new to this forum, glad to find it.
This is driving me nuts.
When driving over 40mph, even when "0" is selected I get warm air coming out of my vents.
The air works whenever it wants to? and when it does I also get hot air on the window and those small vents by the doors and foot vents-at the same time?.
I get cold air in the middle vents across all 4.
I have been reading posts and I do not know what to start with?
monovalve?
fuse?
Climate control unit replacement?-$$
Thanks in advance
I am new to this forum, glad to find it.
This is driving me nuts.
When driving over 40mph, even when "0" is selected I get warm air coming out of my vents.
The air works whenever it wants to? and when it does I also get hot air on the window and those small vents by the doors and foot vents-at the same time?.
I get cold air in the middle vents across all 4.
I have been reading posts and I do not know what to start with?
monovalve?
fuse?
Climate control unit replacement?-$$
Thanks in advance
Super Member
Joined: Jun 2003
Posts: 595
Likes: 0
From: Middlefield, CT
1994 E320
When the climate control is shut off, the fresh air damper is supposed to shut. If this is not happening the vacuum element might be leaking. Big job to replace...
If the heat operates concurrently, the climate control unit might be bad. You can get rebuilt units online at www.thepartsbin.com.
If the heat operates concurrently, the climate control unit might be bad. You can get rebuilt units online at www.thepartsbin.com.
Thread Starter
Newbie
Joined: Apr 2004
Posts: 3
Likes: 0
climate control issues-thanks
Thanks for the suggestions.
If the climate control unit does not fix the problem then I need to do the vacuum element.
Is there a was to diagnose which one is the problem?
Thanks
If the climate control unit does not fix the problem then I need to do the vacuum element.
Is there a was to diagnose which one is the problem?
Thanks
Member
Joined: Mar 2004
Posts: 235
Likes: 0
From: Kansas City, MO, USA
1989 560SEL, 1999 S600, 2005 S600, 2008 S550 4Matic
My own climate control issues!!
While we are at climate control issues, I have two questions to ask about my own W126 sedan.
1) When set to the minimum temperature, cool but not cold air blows? What could be the cause? Needs charging? More coolant? Could the coolant be leaking? Any help would be appreciated.
2) When set to heating, air comes out of the vents by the doors as well as from the vent in the rear seat area, but very little heat comes out of the big vents in the middle. These vents blow out air well when set to cool but not when set to heat. Any idea of what's going on here? Even the local mechanic told me he has to look at the car before he can answer my question.
Thanks for all the help.
1) When set to the minimum temperature, cool but not cold air blows? What could be the cause? Needs charging? More coolant? Could the coolant be leaking? Any help would be appreciated.
2) When set to heating, air comes out of the vents by the doors as well as from the vent in the rear seat area, but very little heat comes out of the big vents in the middle. These vents blow out air well when set to cool but not when set to heat. Any idea of what's going on here? Even the local mechanic told me he has to look at the car before he can answer my question.
Thanks for all the help.
Super Member
Joined: Jun 2003
Posts: 595
Likes: 0
From: Middlefield, CT
1994 E320
noctum: See if you can find a salvage control unit and swap it with your current one. You can test the vacuum element by hooking up a vacuum pump to the vacuum hose at the switchover-valve block. It is located behind the glove box, therefore you will have to remove the glove box.
braverichard: If the air is not frigid (it should be ice cold), the refrigeration system is low on freon, the compressor has failed, or the Klima control unit (protection) is faulty.
Warm air does not blow from the center vents. This is to divert as much air as possible to the windshield for purposes of defogging. Safety first!
braverichard: If the air is not frigid (it should be ice cold), the refrigeration system is low on freon, the compressor has failed, or the Klima control unit (protection) is faulty.
Warm air does not blow from the center vents. This is to divert as much air as possible to the windshield for purposes of defogging. Safety first!
Member
Joined: Mar 2004
Posts: 235
Likes: 0
From: Kansas City, MO, USA
1989 560SEL, 1999 S600, 2005 S600, 2008 S550 4Matic
Originally posted by Jer
braverichard: If the air is not frigid (it should be ice cold), the refrigeration system is low on freon, the compressor has failed, or the Klima control unit (protection) is faulty.
Warm air does not blow from the center vents. This is to divert as much air as possible to the windshield for purposes of defogging. Safety first!
braverichard: If the air is not frigid (it should be ice cold), the refrigeration system is low on freon, the compressor has failed, or the Klima control unit (protection) is faulty.
Warm air does not blow from the center vents. This is to divert as much air as possible to the windshield for purposes of defogging. Safety first!
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Super Member
Joined: Jun 2003
Posts: 595
Likes: 0
From: Middlefield, CT
1994 E320
You do not have to remove the radio. There are two Phillips-head screws under the wood panel (on the lip above the radio). Remove them and slide the console downward and out. Be careful not to break the tabs!
Disconnect the battery before you remove the pushbutton unit.
Disconnect the battery before you remove the pushbutton unit.
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Member
Joined: Mar 2004
Posts: 235
Likes: 0
From: Kansas City, MO, USA
1989 560SEL, 1999 S600, 2005 S600, 2008 S550 4Matic
Originally posted by Jer
braverichard: If the air is not frigid (it should be ice cold), the refrigeration system is low on freon, the compressor has failed, or the Klima control unit (protection) is faulty.
braverichard: If the air is not frigid (it should be ice cold), the refrigeration system is low on freon, the compressor has failed, or the Klima control unit (protection) is faulty.
