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  #1  
Old 12-07-2005, 04:01 PM
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Location: Nashville, TN
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Question Temp gauge -- works...sometimes. Why?

94 C280 with only 51k miles. I've had it for 6 months with no problems -- it is in great shape.

It is pretty cold the last 2-3 weeks (30ish) and I have an odd problem.

Sometimes my temp gauge works and sometimes it doesn't. It will typically be pegged at the bottom. Most of the time at some point in the ride it will suddenly rise up to where it should be. At that point it stays active until the problem reoccurs at a later starting.

1. I have no heater problems (stuck thermostat -- heat works perfectly).
2. I have no engine overheating problems. It never runs hot, and never is at any higher temp than normal when it does decide to work.
3. Coolant is at the proper mix for winter.

Any thoughts or suggestions?
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1994 C280, dark green metallic
105k miles

1991 190E 2.6, Black
191,500 miles
(sold to another forum member)

2003 Chevy Tahoe LT, Redfire Metallic
105k miles

1989 Mustang GT Cobra Convertible
43k miles
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  #2  
Old 12-07-2005, 05:15 PM
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Needle sticking to its stop PEG. Try tapping on the top of the dash next time it doesn't move properly.
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MERCEDES Benz Master Guild Technician (6 TIMES)
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190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
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  #3  
Old 12-07-2005, 07:31 PM
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Join Date: Dec 2001
Location: Nashville, TN
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Oh, I've banged away. Didn't help.
__________________
1994 C280, dark green metallic
105k miles

1991 190E 2.6, Black
191,500 miles
(sold to another forum member)

2003 Chevy Tahoe LT, Redfire Metallic
105k miles

1989 Mustang GT Cobra Convertible
43k miles
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  #4  
Old 12-07-2005, 07:45 PM
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Join Date: Feb 2003
Location: Ontario, Canada
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Quote:
Originally Posted by brookspw
Oh, I've banged away. Didn't help.
The dashboard......not your co-workers.
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2007 C 230 Sport.
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  #5  
Old 12-07-2005, 08:09 PM
Ta ra ra boom de ay
 
Join Date: Jun 2004
Location: Pittsburgh
Posts: 1,915
Is it seperatly fused? (-not my model or year range-) Intermitant bad contact.?.?
I couldn't find a coolant temp sensor for this car. What kind does it use?
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1986 300E 220,000 miles+ transmission impossible
(Now waiting under a bridge in order to become one)

Reading your M103 duty cycle:
http://www.peachparts.com/shopforum/831799-post13.html
http://www.peachparts.com/shopforum/831807-post14.html
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  #6  
Old 12-08-2005, 11:37 AM
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Location: Nashville, TN
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Quote:
Originally Posted by A264172
Is it seperatly fused? (-not my model or year range-) Intermitant bad contact.?.?
I couldn't find a coolant temp sensor for this car. What kind does it use?
This was my first thought -- a fuse/connection or a sensor.

I'm pretty sure it isn't the gauge and I know the actual thermostat and coolant system is fine.
__________________
1994 C280, dark green metallic
105k miles

1991 190E 2.6, Black
191,500 miles
(sold to another forum member)

2003 Chevy Tahoe LT, Redfire Metallic
105k miles

1989 Mustang GT Cobra Convertible
43k miles
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  #7  
Old 12-08-2005, 11:46 AM
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Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,797
Just take the sensor wire off and ground it to see if guage responds.

or take an ohm reading of the sensor.

http://catalog.eautopartscatalog.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=1M30LAGSC1OH0OZIIL&year=1994&make=MB&model=C-280-001&category=P&part=Water+Temperature+Sender

60C-110 ohm
80C-67 "
100C- 38 "
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  #8  
Old 12-08-2005, 03:04 PM
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Join Date: Dec 2001
Location: Nashville, TN
Posts: 551
Quote:
Originally Posted by Arthur Dalton
Where is it located? I am assuming that it is in the very near vicinity of the thermostat housing.

If the gauge shows no reading, and I take the sensor wire off and ground it...are you saying I should see some sort of reading? If I did, then you are saying the sensor is bad?

Thanks,
__________________
1994 C280, dark green metallic
105k miles

1991 190E 2.6, Black
191,500 miles
(sold to another forum member)

2003 Chevy Tahoe LT, Redfire Metallic
105k miles

1989 Mustang GT Cobra Convertible
43k miles
Reply With Quote
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