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  #1  
Old 05-23-2008, 03:44 PM
seanarcher's Avatar
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Join Date: May 2008
Location: spacecoast
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water temp guage not moving,sender?

i own a 300td sedan and the guages all seem to work except for water temperature guage.i am thinking it is the sending unit.i believe it is next to the thermostat.can i test it with a voltmeter?and if it is the sender where can i get a replacement?i tried the chain stores and they dont have one.

thank you
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  #2  
Old 05-23-2008, 05:43 PM
rrgrassi's Avatar
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The temp sender is in the head in between the #2 and #3 glow plugs.
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  #3  
Old 05-23-2008, 05:52 PM
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Water temp sender

The sender is probably a Mercedes-only part. You should be able to get one from Phil; click the "Buy Parts" link at the top of this page. Supporting FastLane is a good thing because they support this forum.

The sender should measure a few hundred ohms or so, I would guess, maybe a thousand. You can check it with an ohmmeter. "Zero" and "infinity" are both bad numbers. The ohmmeter can also test the water temp meter itself; remove the wire from the sender and, with one ohmmeter probe grounded to the block, lightly touch the other probe to the connector on the wire. Your assistant in the passenger compartment should see the meter needle jump. The "ignition" switch needs to be ON for this. If the needle tries to jump "down," you just have the probes reversed. It's almost always a bad sender, IMHO.

The sender next to the thermostat is for the aux fan, I think.

Jeremy
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Last edited by Jeremy5848; 05-23-2008 at 05:54 PM. Reason: Add comment.
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  #4  
Old 05-23-2008, 06:01 PM
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Maybe the connection to the sender is bad, or the plug fell off the sender when you were working on the engine.
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