Is there one somwhere that tells me that the coolant level is low?

__________________
85 300D turbo pristine w 157k when purchased 167,870 July 2025
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked

Nope, unless you have that option. The plug in the expansion tank replaced the low coolant sensor. That would be a good thing to have BTW.

__________________
RRGrassi


70's Southern Pacific #5608 Fairmont A-4 MOW car

13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete.

99 W210 E300 Turbo Diesel, chipped, DPF/Converter Delete. Still needs EGR Delete, 232K

90 Dodge D250 5.9 Cummins/5 speed. 400K

Gone and still missed...1982 w123 300D, 1991 w124 300D

I see the plug with a big C clip. What do I need and where do I get the coolant level option? How much new/used? Is it a float/reed switch gizmo or does it measure resistance?

Let's say I have a hypothetical slow coolant leak and I don't have a level sensor and I do not see coolant on the ground, what are the first signs and is it too late i.e. engine damage?

__________________
85 300D turbo pristine w 157k when purchased 167,870 July 2025
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked

Where to get it and hook it up? That I do not know.

How slow of a coolant leak? I pop the hood on my car every time I fuel up, and do a visual. I had a slow leak, that soon turned to a part time drool. Water pump time for me. Keep checking guages and check the oil for the milkshake look.

__________________
RRGrassi


70's Southern Pacific #5608 Fairmont A-4 MOW car

13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete.

99 W210 E300 Turbo Diesel, chipped, DPF/Converter Delete. Still needs EGR Delete, 232K

90 Dodge D250 5.9 Cummins/5 speed. 400K

Gone and still missed...1982 w123 300D, 1991 w124 300D

The 126's I have looked at have a sensor in the side of the expansion tank. Is that not true of the 300D? The one I am most familiar with is a 1990 420SEL, not a deisel.

__________________
" We have nothing to fear but the main stream media itself . . . ."- Adapted from Franklin D Roosevelt for the 21st century

OBK #55

1998 Lincoln Continental - Sold
Max 1984 300TD 285,000 miles - Sold
The Dee8gonator 1987 560SEC 196,000 miles - Sold
Orgasmatron - 2006 CLS500 90,000 miles
2002 C320 Wagon 122,000 miles
2016 AMG GTS 12,000 miles

AFAIK, the 126 has the sensor but not the 123. Don't think it was an option either.

__________________
http://farm8.staticflickr.com/7271/7...144c3fc1dc.jpg

I'd have to look, but I'm almost certain this was an '86+ thing for MB. I can swear my SD does not have it, yet the SDL does 100% for sure.

__________________
I'm not a doctor, but I'll have a look.

'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k

Six others from BMW, GM, and Ford.

Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG]

None of my cars has that.

__________________
83 SD

84 CD

http://www.***************/search/product.aspx?sid=1teezt450axfdt55g05tfr45&makeid=800016@Mercedes&modelid=1195545@E300D&year=1996&cid=16@Cooling%20System&gid=2184@Coolant%20Level%20Sensor

Would this fit in the expansion tank hole after the plug retained by a C-clip is removed? Does anyone know what type of sensor it is?

__________________
85 300D turbo pristine w 157k when purchased 167,870 July 2025
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked

http://catalog.worldpac.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=2291DK2BB2320WOD0D&year=1985&make=MB&model=380-SE-001&category=All&part=Coolant+Level+Sensor

I need to correct myself, there is a plug on the expansion tank, yet none of the 123's I've seen has it hooked up.

__________________
83 SD

84 CD

OK as far as I can tell from online searches, this level sensor

http://catalog.worldpac.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=2291DK2BB2320WOD0D&year=1985&make=MB&model=380-SE-001&category=All&part=Coolant+Level+Sensor

is from an 87 SDL. Does anyone know if an 87 SDL uses the same expansion tank as the 83 300D's? If so, I may be in luck. Looks like it has a float on a lever arm and with a magnet and a reed switch.

__________________
85 300D turbo pristine w 157k when purchased 167,870 July 2025
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked

Here's the expansion tank plug from 83 300D

http://catalog.worldpac.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=1Q81CPNVK2330S0STI&year=1983&make=MB&model=300-DT-001&category=G&part=Expan.+Tank+Plug+Kit

which looks like it has the same mount as the 87 300SDL coolant level sensor. [http://catalog.worldpac.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=2291DK2BB2320WOD0D&year=1985&make=MB&model=380-SE-001&category=All&part=Coolant+Level+Sensor

Can someone confirm? I want to order one but would hate to get the wrong one.

__________________
85 300D turbo pristine w 157k when purchased 167,870 July 2025
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked

Pretty much all of the 80's W123 and W126 expansion tanks are exchangeable.

My current tank (That has a hole for the level sensor) is from an 88 560SEL.

I'd like to see pics of your setup when you get it done. I'd love to have a sensor like this and I had to buy a new expansion tank for my '84 and the description of the tank said to make sure to include the plug with my order. Are you planing to use one of the free light spaces in the instrument cluster, next to the battery and glow plug light and what not? That seems like a good spot.

__________________
Seth

1984 300D 225K
1985 300D Donor body
1985 300D Turbo 165K. Totaled. Donor Engine. It runs!!!
1980 300SD 311K My New Baby.
1979 BMW 633csi 62K+++? Dead odo