Hi,

I have a 1985 300 SD. Was changing out the thermostat and pulled this wire out of the top sensor. Wondering if I am supposed to solder it to the connection in the plastic housing cap or is it somehow only supposed to make contact with the metal. I tried cleaning the soft metal top area and I see some copper in one spot, which leads me to believe that I should solder it together.

here is a photo of the wire and the plastic connector. I stripped the wire a bit in order to prep it....

Attached Thumbnails

 

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1985 300SD

Yes, it should be soldered. If you heat up the end of the connector you'll find it's filled with solder. Heat it, knock all the old solder out, put in the wire, and add new solder

-J

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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket

Tesla Model 3. 205,000 miles. Been to 48 states!
Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels.
2014 Cadillac ELR
2013 Fiat 500E.

OK, will do. So what does that sensor do? and the two others I see....?

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1985 300SD

I did heat it up and jarred the molten solder out. wow, that's a lot of solder. I re attachdd the wire and everything is fine. so what do those three sensors do?

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1985 300SD

Coolant temp sensor is my guess. I broke the wire on my bro's 80 300SD as well so i have to solder it.

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Current: 1975 450SEL, 83 300D, 88 Yugo GVX, 90 300D OM603 swap, 91 F150 4.6 4v swap, 93 190E Sportline LE 3.0L M104 swap, 93 190E Sportline LE Megasquirt, 03 Sprinter, 06 E500 4Matic wagon.

I knew 2 months ago when I posted on the other coolant temp sensors on the driver's side of the head (search). If I recall correctly, it is an on/off switch that prevents the cabin blower fan from blowing until the coolant is above a certain temperature (then it shorts to gnd). Mercedes wouldn't want to blow cold air on their finicky buyers. Most of us bottom feeders decades later don't give a rat's @ss, and would rather have the blower come on when we push the button. As is, we get constant questions here why the blower takes a long time to come on.

Bill, if you had a 240D the Blower would come on any time you twist the Knob. This one time a 240d does not lag behind.


Charlie

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there were three HP ratings on the OM616...

1) Not much power
2) Even less power
3) Not nearly enough power!! 240D w/auto

Anyone that thinks a 240D is slow drives too fast.

80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff

We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works

my 83 SD the wire gives signal to the glow plug controller

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1999 w140, quit voting to old, and to old to fight, a god damned veteran