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  #1  
Old 04-17-2010, 10:12 PM
New Benz Owner
 
Join Date: Nov 2009
Location: Los Angeles
Posts: 27
'77 450SL issues

Recently acquired a '77 450sl with some issues. It had been sitting for about 10 years. Now that we got her up and running, there are a few issues. One is the tach and clock. They are intermittently working. I don't understand why when the plugs in the back seem to be on all the way.

Also, I got two headrests off a 3ooD at a junkyard that are in beautiful condition. I popped the drivers side off easily and replaced it with the new one. Now, I go to the passenger side one and it will not come off. It slides up to a point and then catches like there is something that needs to be unhooked. Not getting why the driver's side was so easy to come off and the passenger's side isn't.

The window switches don't work....we tested the connectors and they seem fine so I guess(hope) it's just the switches that need replacing. Looking for working used ones because one switch from the dealer comes in at $80!!! WTF? The heater fan will not turn off unless I unplug it from the engine compartment or I pull the fuse. This makes it miserable to drive with the top on. Can't turn it off or make it blow cool air. Going to try and change out the mechanism behind the climate control faceplate and see if that does anything.

Anyone have any idea as to what could be causing these issues? Thanks in advance.
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2000 SL500 - daily driver
1993 400E - project
1981 300D - sold
1982 300TD - sold
1979 450SL - sold
1977 450SL - sold
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  #2  
Old 04-18-2010, 09:19 AM
Registered User
 
Join Date: Jan 2007
Location: ontario canada
Posts: 263
The headrests should be retained by a catch in the seatback, which you can feel as a hard bump under the vinyl in line with one (left?) of the posts a few inches below the top of the seat back. Depress this catch while lifting up the headrest and it should release.
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  #3  
Old 04-18-2010, 10:09 PM
meltedpanda's Avatar
Certified Benzaholic
 
Join Date: Mar 2003
Location: Central Ky
Posts: 6,133
I have had that button get stuck, you can remove seat back to access if what DUGALD says does not work. Tack and clock could be dash ground wire. Switches are easily dismantles , cleaned and repaired, seldom if ever go bad. Fuses OK? I think that car has a fuse for up and down. Not sure about the heat fan , need a little more info. Blows hot when you turn it on or its just stuck on??
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Ron
2011 Porsche Cayman - Bond,James Bond
99 E320 THE Queen Mary
62 220b - Dolly - Finally my Finny!
72 450SL, Pearl-SOLD
16 F350 6.7 Diesel -THOR
07 Lexus RX 350 - Lexi
14 38HP John Deere 3038E Tractor -Mean Green
84 300SD, Benjamin -SOLD
71 220 - W115-Libby ( my first love) -SOLD
73 280 - W114 "Organspende" Rest in Peace
81 380 SL - Rest in Peace
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  #4  
Old 04-19-2010, 05:22 PM
New Benz Owner
 
Join Date: Nov 2009
Location: Los Angeles
Posts: 27
Thanks for the responses. I got the headrest off by taking off the top, standing over the seat, planting my feet firmly and yanking repeatedly. LoL. It came off, finally. The seat was already broken so I figured that's why it wouldn't come off the right way. That and the headrest on the other seat just came right off when I pulled up.

As for this dash ground wire, where exactly is it? I would love to get a wiring diagram for this car.

The switches: We replaced the plugs and still the same problem (only goes up).......I think we'll just bite the bullet and get a brand new switch for peace of mind. If that doesn't work, then I don't know what else it could be. I believe all the fuses are ok.

Fixed part of the climate control today.....changed switches and a plug and it works good. We turned the a/c on and the car sounded different so hoping that with a charge, the a/c would work. All we get is hot air coming out from the car. Is there not a way to draw in cool outside air??? Seems like a design flaw in the system, but maybe that's the way things were back then???
__________________

2000 SL500 - daily driver
1993 400E - project
1981 300D - sold
1982 300TD - sold
1979 450SL - sold
1977 450SL - sold
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  #5  
Old 04-19-2010, 07:39 PM
82 380SL & 96 SL500
 
Join Date: Jun 2008
Location: Southern Illinois
Posts: 245
Here's a good option for the CD manual... on sale no less:

http://www.mercedesmanuals.com/ProductDetails.asp?ProductCode=W%2D107
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  #6  
Old 04-19-2010, 10:30 PM
meltedpanda's Avatar
Certified Benzaholic
 
Join Date: Mar 2003
Location: Central Ky
Posts: 6,133
which way do your climate buttons run , I cannot remember if yours is ACC type 1 or the dreaded ACC with the servo Type II

The dash pod grounds to the metal frame in the dash ,try running a wire from the metal of the dash to a known ground and see if that helps

use a volt meter on both sides of the fuse for the window up and down to ensure you are getting 12V , looks can sometimes fool you on fuses.

Switches can be cleaned, pry apart , clean out goop, be careful of small springs and roller bearings, clean contacts with sandpaper or eraser, reassemble
__________________
Ron
2011 Porsche Cayman - Bond,James Bond
99 E320 THE Queen Mary
62 220b - Dolly - Finally my Finny!
72 450SL, Pearl-SOLD
16 F350 6.7 Diesel -THOR
07 Lexus RX 350 - Lexi
14 38HP John Deere 3038E Tractor -Mean Green
84 300SD, Benjamin -SOLD
71 220 - W115-Libby ( my first love) -SOLD
73 280 - W114 "Organspende" Rest in Peace
81 380 SL - Rest in Peace
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