Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help



Go Back   PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Diesel Discussion

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 02-11-2010, 02:44 AM
dantheman67's Avatar
Registered User
 
Join Date: Jan 2010
Location: California
Posts: 172
240D Two Middle Vents

The two middle vents in my 82 240D always blow the same temperature air regardless of the heat setting, while the far left and far right vents both blow temperature according to my dial setting. I have manual climate control. Anybody know what's wrong?

__________________
1982 240D 4spd, 327,000mi
Reply With Quote
  #2  
Old 02-11-2010, 03:26 AM
johnathan1's Avatar
Registered User
 
Join Date: Feb 2008
Location: Downey, SoCal
Posts: 1,185
As far as I know, that's normal. The outer two vents are the only dash vents that blow heated air. The center vents are only for fresh air, and AC if you have it.

You should slide the lever on the center vents to the right, to close them while using the heater.

My 77' Porsche 924 was the same way, and I think most German cars around that time were designed this way...not sure why.
__________________
Current cars:
2000 ML55 AMG, 163k miles
1998 E430 Sport, 326k miles
1995 S320, 202k Miles
Reply With Quote
  #3  
Old 02-11-2010, 04:04 AM
dantheman67's Avatar
Registered User
 
Join Date: Jan 2010
Location: California
Posts: 172
Thanks!
__________________
1982 240D 4spd, 327,000mi
Reply With Quote
  #4  
Old 02-11-2010, 12:44 PM
Biodiesel300TD's Avatar
|3iodiesel300T|)
 
Join Date: Dec 2004
Location: Albany, OR
Posts: 4,845
As stated above the center vents are fresh air. The lever below it with a triangle on it opens and closes the vent. The blower will push air through it but it's not heated. In cars with AC the center vents blow the cold air.
__________________
Andrew
'04 Jetta TDI Wagon
'82 300TD ~ Winnie ~ Sold
'77 300D ~ Sold
Reply With Quote
  #5  
Old 03-22-2010, 01:16 AM
johnathan1's Avatar
Registered User
 
Join Date: Feb 2008
Location: Downey, SoCal
Posts: 1,185
Just got my AC working, and only my center vents blow cold air. My mechanic seemed to think that my outer vents should also blow cold air, and that something is wrong...is this right?
__________________
Current cars:
2000 ML55 AMG, 163k miles
1998 E430 Sport, 326k miles
1995 S320, 202k Miles
Reply With Quote
  #6  
Old 03-22-2010, 01:33 AM
sd300td's Avatar
huh?
 
Join Date: Jul 2007
Location: San Diego
Posts: 1,116
Quote:
Originally Posted by johnathan1 View Post
Just got my AC working, and only my center vents blow cold air. My mechanic seemed to think that my outer vents should also blow cold air, and that something is wrong...is this right?
I think your mechanic is right. If you're talking about your diesel.
__________________
1982 240 D, 308,000 - 321,127 miles (sold)
1982 300 TD,166,500 - 226,000 miles
1998 E 320, 120,000 - 144,000 miles
2005 C 230 K, 26,000 - 77,000 miles (sold)
Reply With Quote
  #7  
Old 03-22-2010, 02:02 AM
Biodiesel300TD's Avatar
|3iodiesel300T|)
 
Join Date: Dec 2004
Location: Albany, OR
Posts: 4,845
Quote:
Originally Posted by johnathan1
Just got my AC working, and only my center vents blow cold air. My mechanic seemed to think that my outer vents should also blow cold air, and that something is wrong...is this right?
Center vents are the only vents that blow the cold air from the AC.
__________________
Andrew
'04 Jetta TDI Wagon
'82 300TD ~ Winnie ~ Sold
'77 300D ~ Sold

Last edited by Biodiesel300TD; 03-22-2010 at 12:20 PM.
Reply With Quote
  #8  
Old 03-22-2010, 02:11 AM
dantheman67's Avatar
Registered User
 
Join Date: Jan 2010
Location: California
Posts: 172
Quote:
Originally Posted by johnathan1 View Post
Just got my AC working, and only my center vents blow cold air. My mechanic seemed to think that my outer vents should also blow cold air, and that something is wrong...is this right?
Post above answers your question. I have a feeling your mechanic does not work on these old cars regularly.. The center ones blow cold/fresh, the side ones hot.
__________________
1982 240D 4spd, 327,000mi
Reply With Quote
  #9  
Old 03-22-2010, 01:04 PM
toomany MBZ's Avatar
Registered User
 
Join Date: Nov 2006
Location: central Va
Posts: 7,820
The accompanying pics, from the owners manual, may, or may not help.
Attached Thumbnails
240D Two Middle Vents-ccu-settings-001.jpg   240D Two Middle Vents-ccu-settings-002.jpg  
__________________
83 SD

84 CD
Reply With Quote
  #10  
Old 03-22-2010, 03:01 PM
johnathan1's Avatar
Registered User
 
Join Date: Feb 2008
Location: Downey, SoCal
Posts: 1,185
Thanks for that! Only problem is that I have the manual climate control...

Those descriptions seem a bit vague..."At times, air may be emitted from movable nozzles" WTF?
__________________
Current cars:
2000 ML55 AMG, 163k miles
1998 E430 Sport, 326k miles
1995 S320, 202k Miles
Reply With Quote
  #11  
Old 03-22-2010, 03:18 PM
JEBalles's Avatar
Registered User
 
Join Date: Jun 2008
Location: Carlisle, MA
Posts: 1,225
That diagram makes sense. Cold air only comes out those two center ones. It's a little confusing. If only the two center ones blow fresh air, does that mean the rest of the vents recirculate the air in the cabin?
__________________
1983 240D 3.0T 4-speed manual, now sold

1989 Subaru GL Wagon 5-speed Touring Edition
Reply With Quote
  #12  
Old 03-22-2010, 07:06 PM
toomany MBZ's Avatar
Registered User
 
Join Date: Nov 2006
Location: central Va
Posts: 7,820
From the same owners manual.
Attached Thumbnails
240D Two Middle Vents-ccu-manual-controls-001.jpg   240D Two Middle Vents-ccu-manual-controls-002.jpg   240D Two Middle Vents-ccu-manual-controls-003.jpg   240D Two Middle Vents-ccu-manual-controls-004.jpg  
__________________
83 SD

84 CD
Reply With Quote
  #13  
Old 03-23-2010, 12:25 PM
Registered User
 
Join Date: Apr 2009
Location: Sunsites, AZ
Posts: 692
My 240D w/manual control & A/C that works blows cold (A/C'd air) out the side dash vents too! You can control the amount of air out of the side vents by twisting the inside center of the vent, also the whole vent will "roll" around to adjust the direction of the flow!

Look at the last picture above (#4) and 1st column . . . "Rapid Cooling"
__________________
82 240D Manual 277K and still rolling!
02 Volvo S60 AWD For Sale

Last edited by Shawn T. W.; 03-23-2010 at 12:33 PM.
Reply With Quote
  #14  
Old 03-23-2010, 07:14 PM
zeke's Avatar
Registered User
 
Join Date: Sep 2007
Location: The Alamo City, TEXAS
Posts: 1,189
Quote:
Originally Posted by Shawn T. W. View Post
My 240D w/manual control & A/C that works blows cold (A/C'd air) out the side dash vents too! You can control the amount of air out of the side vents by twisting the inside center of the vent, also the whole vent will "roll" around to adjust the direction of the flow!

Look at the last picture above (#4) and 1st column . . . "Rapid Cooling"
x2

Definitely get cold air from all 4 vents with the AC on. In San Antonio with a PO r134a conversion, I need all the help I can get!

Maybe it is a vacuum pod issue? I know when I turn on the AC control, a pod inside the dash 'pops', then I start getting cold air out of the vents.
__________________

Current Mercedes
1979 maple yellow 240D 4-speed


Gone and fondly remembered:
1980 orient red 240D 4-speed

Gone and NOT fondly remembered:
1982 Chna Blue 300TD

Other car in the stable:
2013 VW Jetta Sportwagen TDI / 6-speed MT
Reply With Quote
  #15  
Old 03-23-2010, 09:54 PM
soothappens's Avatar
Registered User
 
Join Date: Nov 2009
Location: Alamo city
Posts: 494
Quote:
Originally Posted by zeke View Post
x2

Definitely get cold air from all 4 vents with the AC on. In San Antonio with a PO r134a conversion, I need all the help I can get!

Maybe it is a vacuum pod issue? I know when I turn on the AC control, a pod inside the dash 'pops', then I start getting cold air out of the vents.
My manual AC does the same thing . Definitely a pod issue or vacuum problem. the one by the blower controls the cabin / outside air door mine sometimes needs a push. I also put the lower handle "defrost / floor" to floor.
If the max ac knob is "in" (blue knob )
floor vents shut off increasing air to upper vents.
If max ac knob is pulled "out"
then Bi level is on and ac will come out both top vents and floor vents .

Theres a pod on the passenger side by the center console. This controls the turning off of the floor vents in max AC mode. If its not working the max knob can be in or out and air will constantly come out of the floor vents. I found that by accident with a mighty - vac. The line comes frome behind the AC max switch.

I also suffer San Antonio summers so the 80% cabin 20% outside set up had to go. The door is in the channel leading to the cabin on the firewall below the windshield. I removed the cowl vent (black screen in front of windshield ) and with my best ability sealed the 1/4 inch gap around the fresh air door. it sits about arms length in the channel. I used silicone . Sure its inoperable but if I need fresh air I roll down the window.

The blower on these systems with all the vents opened is far from what I would consider adequate . More like a light breeze and if your evaporator is dirty its even worse.

My next project : Find a bigger blower and adapt !!

110 degrees and you learn fast!

Hope this helped.

__________________


Experience : what you receive 3 seconds after you really needed it !!




86 300SDL 387,000? Motor committed suicide
81 300SD 214,000 "new" 132,000 motor
83 300SD 212,000 parts car
83 300SD 147,000

91 F700 5.9 cummins 5spd eaton 298,000
66 AMC rambler American 2dr auto 108,000
95 Chevy 3/4 ton auto 160,000
03 Toyota 4runner 180,000 wifes
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -4. The time now is 09:08 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page