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#1
03-13-2010, 07:19 PM
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temp gauge sending unit 72 220d
where is sending unit,is it on head above glow plugs?i know it is mechanical,not really sure what that means ,can i just change out sending unit or is it all one hard wire to gauge?
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95 e320,87 sdl,79 300sd 
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#3
03-15-2010, 01:10 PM
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I do not have a 72 220d. The 84 190D had the same problem with a non functional temp gauge. I am telling you what I did and it may or may not apply to the 220d. My 190D temp sensor is in the engine block where the glow plugs are. A ONE pin sensor with a wire to it. I remove the connector, shorted the connector to ground and the gauge shot up to red. It shows the gauge and the wiring from the connector to the gauge is good. I replaced the sensor and all is well.
Hope this help.
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Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed.  W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html 1 X 2006 CDI 1 x 87 300SDL 1 x 87 300D 1 x 87 300TDT wagon 1 x 83 300D 1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry.
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#4
03-15-2010, 04:05 PM
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Quote:
You should be able to follow that wire to the engine.
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1976 240D 1976 240D parts car 1970 220D daily driver
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#5
03-15-2010, 08:40 PM
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Not sure, but I think on a 220D it may be a metal tube rather than a wire.
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Palangi 2004 C240 Wagon 203.261 Baby Benz 2008 ML320 CDI Highway Cruiser 2006 Toyota Prius, Saving the Planet @ 48 mpg 2000 F-150, Destroying the Planet @ 20 mpg TRUMP .......... WHITEHOUSE HILLARY .........JAILHOUSE BERNIE .......... NUTHOUSE 0BAMA .......... OUTHOUSE
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#6
03-15-2010, 08:41 PM
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Yes its a metal tube filled with ether, as it gets hot the ether expands and causes the gauge to rise.
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1985 300TD Turbo Euro-wagon 1979 280CE 225,200 miles 1985 300D Turbo 264,000 miles 1976 240D 190,000 miles 1979 300TD 220,000 GONE but not forgotten 1976 300D 195,300 miles 1983 300D Turbo 175,000 miles http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg
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