Still have no heat problem with 80 450SL - Mercedes-Benz Forum
Reply
 
LinkBack Thread Tools Display Modes
#1 (permalink) Old 02-10-2012, 07:29 AM
BenzWorld Junior Member
 
Date registered: Sep 2011
Vehicle: 1980 450SL
Location: Stone Mountain, GA
Posts: 12
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
(Thread Starter)
Still have no heat problem with 80 450SL

Lost heat in 80 450SL quite a while ago. Changed out thermostat, did not help. Ordered new Auxiliary heat pump, does that usually solve the problem?
Can I change it out myself?
Attached Thumbnails
Click image for larger version

Name:	MB.jpg
Views:	107
Size:	76.3 KB
ID:	425451  
Bud in Stone Mountain is offline  
Sponsored Links
Advertisement
 
#2 (permalink) Old 02-10-2012, 10:03 AM
BenzWorld Member
 
Logikal's Avatar
 
Date registered: Dec 2011
Vehicle: 1974 450SL; 2009 CLS550
Location: Pittsburgh, Pa
Posts: 202
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
More details needed, is the blower motor working properly? Do you know if the heater core is blocked or is it sufficiently flowing? Also do you have slide controls or the prone to break ACCII controls?
Logikal is offline  
#3 (permalink) Old 02-10-2012, 10:06 AM
RC Colas® & Moon Pies®
 
Digmenow's Avatar
 
Date registered: Oct 2006
Vehicle: 1981 380SL 151K (and holding)
Location: The Land of Pleasant Living
Posts: 32,540
Mentioned: 5 Post(s)
Tagged: 2 Thread(s)
Quoted: 66 Post(s)
Lifetime Premium Member
My money is on your climate control servo. Do any of the heater hoses under the hood get hot after the car warms up?

Here's a thread without resolution yet (Rory, anything?) but you might find an answer along the way.

1978 450 ACCII Investigation/Repairs

Quis custodiet ipsos custodes?
Digmenow is offline  
#4 (permalink) Old 02-10-2012, 11:59 AM
One of the BW Old Guard
 
Ears's Avatar
 
Date registered: Aug 2004
Vehicle: 1988 560Sl
Location: Fort Payne, Al
Posts: 5,623
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 32 Post(s)
Lifetime Premium Member
Quote:
Originally Posted by Digmenow View Post
My money is on your climate control servo. Do any of the heater hoses under the hood get hot after the car warms up?

Here's a thread without resolution yet (Rory, anything?) but you might find an answer along the way.

1978 450 ACCII Investigation/Repairs
Assuming his '80 has the ACCII system, I concur... Damned Servo! Servo motor likely frozen, therefore amp also likely Tango Uniform. Consider Unwired Tools (brand) digital conversion if servo is found to be FUBAR. AUX pump easy to change, but likely not the culprit as heat will flow without it.

You can remove the top of the servo easily enough, and watch for movement in the unit when switching heating/cooling modes... Check the EGv107 for info on the ACCII climate system, or the FSM.

Best of luck!

RM Smith www.rmsmithco.com

Where is it again that we are going... And why are we in a handbasket?
Ears is offline  
#5 (permalink) Old 02-10-2012, 02:25 PM
RC Colas® & Moon Pies®
 
Digmenow's Avatar
 
Date registered: Oct 2006
Vehicle: 1981 380SL 151K (and holding)
Location: The Land of Pleasant Living
Posts: 32,540
Mentioned: 5 Post(s)
Tagged: 2 Thread(s)
Quoted: 66 Post(s)
Lifetime Premium Member
I loved my UT digital conversion for the week that it worked until the blower seized.


Quis custodiet ipsos custodes?
Digmenow is offline  
#6 (permalink) Old 02-10-2012, 02:34 PM
Moderator
 
rowdie's Avatar
 
Date registered: Jun 2008
Vehicle: '73 450SL: '81 280SL: 1986 560SL: '84 500SL AMG: 1984 280SL 5 speed (Strassenkröte)
Location: OklahoMoKan
Posts: 23,900
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 8 Post(s)
Lifetime Premium Member
Quote:
Originally Posted by Digmenow View Post
I loved my UT digital conversion for the week that it worked until the blower seized.

Do you think that caused the failure?
rowdie is offline  
#7 (permalink) Old 02-10-2012, 03:24 PM
BenzWorld Junior Member
 
Date registered: Sep 2011
Vehicle: 1980 450SL
Location: Stone Mountain, GA
Posts: 12
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
(Thread Starter)
Quote:
Originally Posted by Logikal View Post
More details needed, is the blower motor working properly? Do you know if the heater core is blocked or is it sufficiently flowing? Also do you have slide controls or the prone to break ACCII controls?
Motor works fine, controls change between top window vents and dash vents/floor vents just fine. Just temp is cold.
80 has the ACCII controls. not the slide controls.
Bud in Stone Mountain is offline  
#8 (permalink) Old 02-10-2012, 03:25 PM
BenzWorld Junior Member
 
Date registered: Sep 2011
Vehicle: 1980 450SL
Location: Stone Mountain, GA
Posts: 12
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
(Thread Starter)
Quote:
Originally Posted by Digmenow View Post
My money is on your climate control servo. Do any of the heater hoses under the hood get hot after the car warms up?

Here's a thread without resolution yet (Rory, anything?) but you might find an answer along the way.

1978 450 ACCII Investigation/Repairs
yes, the heater hoses do warm up.
Bud in Stone Mountain is offline  
#9 (permalink) Old 02-10-2012, 03:32 PM
RC Colas® & Moon Pies®
 
Digmenow's Avatar
 
Date registered: Oct 2006
Vehicle: 1981 380SL 151K (and holding)
Location: The Land of Pleasant Living
Posts: 32,540
Mentioned: 5 Post(s)
Tagged: 2 Thread(s)
Quoted: 66 Post(s)
Lifetime Premium Member
Quote:
Originally Posted by rowdie View Post
Do you think that caused the failure?
I can't see how but there was an occasional hamster wheel squeak from time to time last summer so it may have been heading that way all along.

Quote:
Originally Posted by Bud in Stone Mountain View Post
yes, the heater hoses do warm up.
Take a good flashlight and look around the servo. It's the part with the big trapezoidal plastic top. I'm betting you'll see a crack in the side of it like the one in this picture running top to bottom on the middle, can shaped portion.



I'd place confidence that it's the servo at around 94%. Also, as ears said above, the amplifier is most likely burned up as well. It lives inside the car, way up on the firewall behind the glove box.

I employed my brother-in-law who is an auto technician to do the heavy lifting and the Unwired Tools digital unit was installed and operational in about 3 hours.

Quis custodiet ipsos custodes?
Digmenow is offline  
#10 (permalink) Old 02-10-2012, 03:33 PM
BenzWorld Junior Member
 
Date registered: Sep 2011
Vehicle: 1980 450SL
Location: Stone Mountain, GA
Posts: 12
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
(Thread Starter)
Installed the aux pump, but havent started car yet. If I take off the top of the servo *(how to do it?_) what do I look for?
I saw the UT conversion, but price scared me unless I tried all the other alternatives.
Bud in Stone Mountain is offline  
Reply

  Mercedes-Benz Forum > Mercedes-Benz Roadster Forums > R/C107 SL/SLC Class


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
User Tag List

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Topic Author Forum Replies Last Post
'1972 450SL dashboard heat/ac vent' oldride R/C107 SL/SLC Class 2 08-20-2009 08:09 PM
No Heat 78 450SL newbenzy R/C107 SL/SLC Class 2 09-28-2006 04:06 PM
78 450SL Heat always on jlon R/C107 SL/SLC Class 0 07-27-2004 07:39 PM
NO HEAT! Help 79 450sl Guest (MBNZ) R/C107 SL/SLC Class 0 04-26-2001 08:43 AM
NO HEAT! Help 79 450sl Guest (MBNZ) General Mercedes-Benz 0 04-26-2001 08:43 AM

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 Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome