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#1
11-01-2023, 07:12 PM
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What component is this?
Howdy folks,
I've got a '78 240d I've been having a blast driving around & catching up on routine maintenance. Today I went to check oil level before a drive & noticed a wire connected to something on the thermostat housing was disconnected completely. There was no connector on the end, just black housing, couldn't tell if there was electrical wire inside or not, I tucked it back into the black rubber connector on the therm housing but clearly this wire or whatever it is isn't doing anything. What is this part? What should be happening here? Thanks, MEK 
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#4
11-01-2023, 08:51 PM
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If that is an AC car I think it is for the electric fan. The engine temp sensor for the gauge is in the head near the glow plugs. IIRC it is the most rearward one if there are more than one.
__________________
"Rudeness is a weak man's imitation of strength" - Eric Hoffer
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#5
11-01-2023, 10:35 PM
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Quote:
thanks, Mek
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#6
11-01-2023, 11:16 PM
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If the dash temp gauge works it is ok. It could be tested easily, use an ohmmeter on the switch cold then test it hot. My guess is it will open in one condition and closed on the other. Open when cold and closed when hot is my guess.
__________________
"Rudeness is a weak man's imitation of strength" - Eric Hoffer
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#7
11-01-2023, 11:23 PM
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For your reading pleasure...
https://www.pelicanparts.com/techarticles/Mercedes-W123/09-WATER-Auxiliary_Fan_Switch_Replacement/09-WATER-Auxiliary_Fan_Switch_Replacement.htm
__________________
"Rudeness is a weak man's imitation of strength" - Eric Hoffer
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#8
11-02-2023, 11:47 AM
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yeah, it triggers the aux fan. regardless of if the ac is working
__________________
 1977 240D auto w/OM616.916 engine 2005 Matrix 5spd 2006 Prius https://photos.app.goo.gl/AdP7i8xfCJeFuk5y9 glass pendant necklace http://glasspendantnecklace.com fused glass pendant http://fusedglasspendant.com
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#9
11-03-2023, 12:05 AM
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On my 300d that sensor delays the activation of ACC on a cold day so you don’t get an ice cold blast of air in your face on startup. Perhaps the 240 has a similar system. Odd because they have fully manual water valves. Maybe it’s for something sense on the 240.
__________________
79 300TD “Old Smokey” AKA “The Mistake” (SOLD) 82 240D stick shift 335k miles (SOLD) 82 300SD 300k miles 85 300D Turbodiesel 170k miles
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#10
11-11-2023, 10:09 PM
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Quote:
__________________
84 300D, 82 Volvo 244Gl Diesel
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