[W126 Coupe] Outside airtemp gauge

[Dick Spellman]

Hi Stein and Jay,

Actually the wire from the sensor (affixed under your front bumper) 
ruins in one complete harness up your fender well and to a connector 
under the fuse holder tray.  It is the only cable carrying both (-) 
voltage and (+) voltage to traverse the underside of your fuse tray.  It 
is also a possible point of trouble should the ground come in contact 
with the hot side of any of the fuse holder terminals.  This was a 
problem in 86 and earlier MB's where the harness insulation melted and 
you had ground contacting hot power with no fuse to break the circuit.

To check..disconnect your battery ground then remove the screw sets on 
the fuse tray and lift from the front upward.  Look for a 2-wire cable 
and connector.  The cable from the sensor is connected to the cable 
running to your IC at this point.  If you see any signs of heat on the 
cable insulation, you have found your problem.

In either case bad cable or bad sensor this is where the replacement 
sensor plugs into the cabin IC harness.  If you need detail on repairing 
the IC harness due to insulation failure.  Send me a note.

Regards,
Dick


Jay Manek wrote:

> It will be the sensor.. A used one is actually easier as you can snip the wire under the front bumper and rejoin the new sensor. Otherwise the wire goes all the way to the cabin.

>

>

> Sent from my BlackBerry

>

> -----Original Message-----

> From: Jonathan Hodgman <blueridgemb at gmail.com>

>

> Date: Sat, 20 Jun 2009 12:47:22 

> To: Stein Stromsoe<Stromsoe at earthlink.net>; Mercedes Coupes Mailing Lists<mbcoupes at mbcoupes.com>

> Subject: Re: [W126 Coupe] Outside airtemp gauge

>

>

> Changing out the temp sensor would be your cheapest and best hope...  

> Otherwise it's the module/display in the dash which is Pricey.

>

> Jonathan

>

> Stein Stromsoe wrote:

>   

>> My outside tempratue gauge is counting up and down on its own.

>> A nice 65F day, and it is indicating 100-119F. Then at times opposite. 

>> Never correct.

>> I have replaced the convenience control module previously (1 year ago 

>> due to sunroof issue)

>> Not sure if this is controlled by that unit.

>> Up until this spring it was just fine.

>> Help.

>>

>> Stein

>> 92 400E

>> 86 500SEC - RIP

>> The MB Coupes Website!

>> W126 SEC Mailing List

>> Postings remain property of MB Coupes, L.L.C.

>>

>>     

>

>

>   

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