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  #1  
Old 06-08-2003, 05:03 AM
stickball
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420 SEL overheating or?

My 1991 420 SEL has a little temp guage quirk, started today. Engine cold, start car, temp guage goes immediately to 80+ (C).
It then goes up a little as the engine works.

Normally of course it would be at 0, just below 40 (C) then stay somewhere between the 60 - 80 range (C).

I'm thinking possible temp sender? Maybe a static resistance reading on the sender that I can measure. Possibly beginning to fail and using the 80 mark as a starting point?

Any experiences with this issue?

thanks..... s-ball
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  #2  
Old 06-08-2003, 09:59 PM
This space for sale
 
Join Date: Feb 2002
Posts: 3,325
80*C is the ideal normal operating tempreture. Don't see any problems.
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  #3  
Old 06-08-2003, 10:03 PM
sixto's Avatar
smoke gets in your eyes
 
Join Date: Jun 2000
Location: SF Bay Area
Posts: 19,744
I think our friend is saying that the gauge reads 80C when first started in the morning.

Check that there's a good connection between the wire and the sensor and maybe pull the sensor and clean the threads on the sensor side and engine side to make sure there's a good ground path. No sealant, thread lock or teflon tape.

Sixto
95 S420
91 300SE
87 300SDL
83 300SD
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  #4  
Old 06-09-2003, 12:32 AM
stickball
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right you are SIXTO:

It starts at 80 when cold.

I'm looking into fasteners at connection and threads into block.
thanks.

s-ball
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  #5  
Old 06-09-2003, 10:23 AM
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Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,777
Here is that info: [ single wire sensor-read from terminal to ground].

60C-110 ohm
80C-67 ohm
100C-38 ohm
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  #6  
Old 06-09-2003, 08:32 PM
stickball
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THANKS TO ALL.....

dirty connection points created additional resistance which created an improper signal

problem now solved

s-ball
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  #7  
Old 06-09-2003, 08:35 PM
Moderator
 
Join Date: Dec 2001
Location: Southern California, U.S.A.
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You can always count on Arthur to have ESP and to have a mind like a steel trap.

I don't know how he remembers all those numbers!
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2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".
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