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Old 05-23-2008, 03:44 PM
seanarcher's Avatar
Join Date: May 2008
Location: spacecoast
Posts: 138
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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Old 05-23-2008, 05:43 PM
rrgrassi's Avatar
mmmmmm Diesel...
Join Date: Jun 2006
Location: Royse City Tx
Posts: 4,872
The temp sender is in the head in between the #2 and #3 glow plugs.

70's SPM #5608 Fairmont A-4 MOW car

06 VW Jetta TDI 210K miles

03 VW Golf TDI 5 speed 372K Miles

RIP--Lost in fire...82 300D 322K was My Daily Driver-On the search for a w126 now...

90 Dodge D250 5.9 Cummins/5 speed. 350K
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Old 05-23-2008, 05:52 PM
Jeremy5848's Avatar
Registered Biodiesel User
Join Date: Mar 2006
Location: Sonoma Wine Country
Posts: 8,394
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.


"Buster" in the '95

Our all-biodiesel family
1995 E300D (W124) . .239,000 miles My car
1996 E300D (W210) . .313,000 miles Wife's car
Santa Rosa population 170,685 (2012)
Total. . . . . . . . . . . . 722,685
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970

Last edited by Jeremy5848; 05-23-2008 at 05:54 PM. Reason: Add comment.
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Old 05-23-2008, 06:01 PM
bgkast's Avatar
Rollin' on 16s
Join Date: Dec 2005
Location: Vancouver WA
Posts: 6,528
Maybe the connection to the sender is bad, or the plug fell off the sender when you were working on the engine.
1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine
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