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  #1  
Old 12-22-2014, 09:12 PM
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temperature gauge

The past few days I've noticed that my temp gague is running slightly above it's usual position. Yesterday I was looking at it (after driving around) and it was jumping up and down. Anybody know what could cause this?

Merry Christmas,,

Hugh Sr.

1984 190d (W201) 133.232
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Old 12-22-2014, 09:30 PM
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Quote:
Originally Posted by hsmith View Post
The past few days I've noticed that my temp gague is running slightly above it's usual position. Yesterday I was looking at it (after driving around) and it was jumping up and down. Anybody know what could cause this?

Merry Christmas,,

Hugh Sr.

1984 190d (W201) 133.232
The jumping might be related to a bad (engine) ground, at least that's what i'd check first.
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Old 12-22-2014, 09:50 PM
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Top the coolant level, and see it that helps.
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Old 12-22-2014, 09:56 PM
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Does jumping up and down mean the needle fluctuates with no change in load or even at idle, or does it seem particularly sensitive to engine load and airflow through the radiator?

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  #5  
Old 12-22-2014, 10:05 PM
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If the fluctuating is seemingly random, this is what happened to me when the temperature sending unit was failing. It would read high for a while, then bounce back down to normal---sometimes just bounce around within a range.

A new sending unit cured the problem. But definitely check the wiring, connector at the head, and engine ground, as was mentioned, before suspecting the sending unit.
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Old 12-22-2014, 11:49 PM
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In agree to check the engine to body ground. I had that problem, would spike up high, and drop back and jump up again. turn off the engine, restart and back to normal.

I swapped in a new temp sender, even changed the gauge, still the problem.

Finally removed and cleaned ground strap and things were back to normal.

Charlie
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  #7  
Old 12-23-2014, 10:13 AM
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I have the same exact issue. Seems when my car gets up above 80 degrees or so it will randomly jump up to 100 and back down. It is very random. I have checked the battery ground and also changed the sending unit. Changing the sending unit made my car run a little cooler but the random fluctuation is still there. And have only seen it do this when the temp is reading above 80.

82 300D
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Old 12-23-2014, 05:55 PM
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Where are the ground straps located?

Hugh Sr.

1984190d (W201) 133,232
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  #9  
Old 12-23-2014, 06:02 PM
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Ground strap is located beneath the car, connects the engine and body together. Most models it is located on the left side, below where the driver's feet would be.

Just to be clear, the engine temperature cannot change instantaneously due to the thermal mass of the engine. 10 to 20 degree swings over a few seconds are an electrical problem with the gauge system. Now if the temperature swings occur over a minute or so then you have a cooling problem.
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