External temp gauge

1979-1991 280SE, 300SE, 300SEL, 380SE, 380SEL, 380SEC, 420SE, 420SEL, 420SEC, 500SE, 500SEL, 500SEC, 560SEL, 560SEC
Post Reply
User avatar
jas-300-sel
C Class
Posts: 42
Joined: Tue 25 Aug, 2015 11:12 pm
Model you own: w126

External temp gauge

Post by jas-300-sel » Tue 20 Jun, 2017 10:43 pm

Hi guys weird thing happen the other night, it was about 18 deg outside but when parked outside a friends house waiting for them to come down my outside temp gauge started to climb quite quickly, in the space of 5 mins it went up to 42 deg. My engine temp gauge was about 90 deg. I turned the car off and went inside for 10 mins when I came out again all was normal. Happened again yesterday in heavy traffic but only it went from 22 deg up to 28 deg, same engine running temp of about 90 deg which is a little warm but traffic was stop start and very slow. My viscous fan does need replacing, it's not broken but it just lost some of its resistance. This shouldn't affect the outside temp sensor?

Car was serviced last couple of weeks
Wiper motor was rebuilt last week
Young guy at the workshop washed my car with a gurney. I know this as the l/h well in the boot was damp and that happens when you squirt a gurney down the boot channel and the high pressure water forces its way over the seal, I've done myself once & only once. I'm worried could he have damaged the outside temp sensor if he was over zealous with the gurney around the front end of the car like he was around the boot?

Any thoughts?

Is the sensor easy to find and is it a cheap and easy DIY replacement?

Cheers

Jas.
'89 300 SEL

User avatar
T-Modell
SLS AMG
Posts: 2581
Joined: Mon 10 Apr, 2006 1:47 am
Model you own: w107
Location: Weinheim / Germany
Contact:

Re: External temp gauge

Post by T-Modell » Tue 20 Jun, 2017 10:51 pm

Hi Jas,

the sensor on my R107 (I assume it's the same with the W126) is mounted behind the front license plate holder. The sensor is firmly attached to its cable, so if you take off the front license plate it should hang on that sensor. Maybe check that first and see how it looks.

Regards
Thomas
---------------------------------------------------------------
1967 W111 250SE Cabriolet, horizon blue
1973 W115 220D 5.0 Pick-Up Argentina, work in progress 2017/18
1986 R107 500SL, arctic white, the midlife crisis viagra replacement
2007 R171 SLK350, calcit white
2008 S211 E63T, calcit white, sleeper

User avatar
jas-300-sel
C Class
Posts: 42
Joined: Tue 25 Aug, 2015 11:12 pm
Model you own: w126

Re: External temp gauge

Post by jas-300-sel » Wed 21 Jun, 2017 1:56 pm

Oh dear Thomas I might have to get my hands dirty, even my shirt if I have to lie down and stick my head under the front bumper :(

Not very becoming of an S Class owner

Thanks mate

Jas.
'89 300 SEL

User avatar
Tony From West Oz
OZBENZ moderator
Posts: 3083
Joined: Mon 20 Jun, 2005 10:04 pm
Model you own: w202
Location: Bedfordale WA

Re: External temp gauge

Post by Tony From West Oz » Thu 22 Jun, 2017 12:14 am

jas-300-sel wrote:Oh dear Thomas I might have to get my hands dirty, even my shirt if I have to lie down and stick my head under the front bumper :(

Not very becoming of an S Class owner

Thanks mate

Jas.
Jas, just get the Mrs / Girlfriend / significant other to get under there and check it out. Easy as - LOL
Life is a journey, with problems to solve, lessons to learn, but most of all, experiences to enjoy.

'83 W123 300D 325000km (Wife's car Josephine - sold).
'84 W123 300D replaced good OM617 912 with OM617 952 and enjoyed having good acceleration for the first time since first driving a 300D in 2002 - became engine and trans donor for 300CD Turbodiesel conversion. Now parted out.
'86 W124 300D sold (Wife's old car - sold )
'85 W123 300CD, 275 000km (Fatmobile) rebuilt turbodiesel from previous Fatmobile transplanted into 280CE (occasional tourer)
'99 W202 C250 Turbodiesel (my darling Wife's car - Sold)
'98 W202 C250 Turbodiesel (my car - Sold)
'06 Ssanyong Musso Crew Cab 2WD Ute (OM662 diesel and Auto Transmission)

User avatar
T-Modell
SLS AMG
Posts: 2581
Joined: Mon 10 Apr, 2006 1:47 am
Model you own: w107
Location: Weinheim / Germany
Contact:

Re: External temp gauge

Post by T-Modell » Thu 22 Jun, 2017 4:29 pm

There are several alternatives ... get gloves and lift the car ... go to the US army and get one of those mirrors with a stick, you might be able to see it then.

Or you get one of these here, just wind the window down a bit and put the sensor out:
Image

Hope, we could solve your problem :laughing6:
Thomas
---------------------------------------------------------------
1967 W111 250SE Cabriolet, horizon blue
1973 W115 220D 5.0 Pick-Up Argentina, work in progress 2017/18
1986 R107 500SL, arctic white, the midlife crisis viagra replacement
2007 R171 SLK350, calcit white
2008 S211 E63T, calcit white, sleeper

User avatar
91MercCoupeMBL
Dernburg Wagon
Posts: 9
Joined: Sat 06 May, 2017 11:02 pm
Model you own: w126
Location: Boston Metro West

Re: External temp gauge

Post by 91MercCoupeMBL » Wed 05 Jul, 2017 10:16 pm

T-Modell wrote:There are several alternatives ...
Or you get one of these here, just wind the window down a bit and put the sensor out:
Image

Thomas
That's really a very good idea I feel. Those digital thermometers are dirt cheap & available from just about anyplace...

I would use it to see if the MB outside temp sensor is accurate... Test the calibration... You would know right away were something amiss.

My money is on the MB one as working properly...

In stop & go traffic / idling stopped.. both my SECs display rising temperatures as you describe.. which then lower to ambient air temp as road speed increases..

Good luck,

MBL

Post Reply

Return to “W126”