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Old 06-08-2003, 04:03 AM
Posts: n/a
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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Old 06-08-2003, 08:59 PM
This space for sale
Join Date: Feb 2002
Posts: 3,338
80*C is the ideal normal operating tempreture. Don't see any problems.
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Old 06-08-2003, 09:03 PM
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smoke gets in your eyes
Join Date: Jun 2000
Location: SF Bay Area
Posts: 20,126
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.

95 S420
91 300SE
87 300SDL
83 300SD
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Old 06-08-2003, 11:32 PM
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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.

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Old 06-09-2003, 09:23 AM
Registered User
Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,784
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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Old 06-09-2003, 07:32 PM
Posts: n/a

dirty connection points created additional resistance which created an improper signal

problem now solved

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Old 06-09-2003, 07:35 PM
Join Date: Dec 2001
Location: Southern California, U.S.A.
Posts: 8,508
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!
Paul S.

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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