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  #1  
Old 11-12-2018, 04:12 PM
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Heater fan is not working on1983 500 SL

I have the above issue. Where should I start. Is there a relay to check? I was looking in the fuse block and notice that the fuse for the aux fan looks as though it has been hot. Wouldn’t that be for engine cooling fan? Thanks for any information. Nick.
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  #2  
Old 11-12-2018, 07:03 PM
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The fan is extremely flaky on my SL. The culprit in my case is the pushbutton unit. If you push around on enough buttons for long enough, it'll kick on finally, then later crap out again. I've been too lazy to pull the unit and clean the contact and resolder the circuit board.

The Aux fan is the electric cooling fan in front of the radiator. If you still have the old aluminum fuses, hit the trash with them and replace with brass or copper. The aluminum ones degrade and contribute to lots of strange problems due to poor connections.
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'11 Honda Accord EX - "The Daily" 64K
'83 500SL Euro - "The Money Pit" 116K
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'86 300SDL - "The Diseasel" 189K (Totaled 1/31/19)
The Diseasel Thread - Everything You Didn't Know You Wanted To Know
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  #3  
Old 11-12-2018, 09:43 PM
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Thanks. I went to move the car. Upon starting it the fan came in for a second then off. I wiggles the key backnjust slightly and it came to life. Sounds like a problem with the ignition switch. Thanks for the information on the fuses.
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  #4  
Old 11-12-2018, 09:51 PM
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If wiggling the key got the fan to come on, time for a new electrical part of the switch. It has a contact that controls the fan circuit.
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'11 Honda Accord EX - "The Daily" 64K
'83 500SL Euro - "The Money Pit" 116K
'91 350SD - "The Diseasel Jr." 168K
'86 300SDL - "The Diseasel" 189K (Totaled 1/31/19)
The Diseasel Thread - Everything You Didn't Know You Wanted To Know
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  #5  
Old 11-13-2018, 06:24 PM
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Hopefully it won’t be as much fun as my 1983 633CSI to change out.
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  #6  
Old 11-14-2018, 11:49 AM
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For me the hardest part was removing the steering wheel. Make sure the steering is unlocked.

A while you are there. If you haven't already replaced the odometer gears now is a good time. They will fail.
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  #7  
Old 04-14-2019, 01:47 AM
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Is there a write up for this procedure? Thanks.
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  #8  
Old 04-14-2019, 04:34 PM
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Yes https://www.benzworld.org/forums/r-c107-sl-slc-class/1495136-steering-wheel-removal-odometer-repair-tutorial.html
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  #9  
Old 04-14-2019, 09:48 PM
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I have removed the instrument cluster on a number of W123 cars without the need to remove the steering wheel.
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  #10  
Old 04-15-2019, 11:52 PM
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Quote:
Originally Posted by BWhitmore View Post
I have removed the instrument cluster on a number of W123 cars without the need to remove the steering wheel.
With all due respect, the r107 platform is familiar enough to be comfortable for a seasoned w123 owner, yet different enough to greatly annoy.

In this instance, if you sit in the cabin of any era r107 for any amount of time, you'll quickly realize that the steering wheel is a lot closer to the instrument cluster than a w123 is. It is impossible to remove the cluster without removing the wheel.

Source: Owned both and tried.
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Quote:
Originally Posted by Yak View Post
Going back to the original post: "Can you get the vac to blow instead?" No. Vacuums are low pressure so they by nature "suck" and nature abhors them.
1984 380SL

Last edited by okyoureabeast; 04-16-2019 at 01:07 AM.
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