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Old 06-01-2002, 10:18 PM
J.HIDALGO's Avatar
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Join Date: Jul 1999
Location: Jax, FL
Posts: 1,785
Just go to NAPA!

They sell a dye (cheap) which you add to the coolant. Drive the car for a while then use a black light (cheap) to find the leak. Very inexpensive and accurate way to find a leak. Good luck!
'86 300E
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Old 06-02-2002, 02:02 PM
blaubenz_mb's Avatar
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Join Date: Sep 2001
Posts: 52
Coolant Leak

There are two main ways that your car can leak coolant. The first is a faulty head gasket, which you don't want... The second is a through a small "weep" hole in the bottom of the water pump, which means that your pump needs to be replaced. Even though the pump is leaking, coolant may or may not collect under the car. Keep an eye on these two places when checking your system...

Also add the coolant (engine) temperature sensor to your grocery list of items that may cause excessive fuel consumption.

Hope that helps!

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Old 08-03-2002, 03:44 AM
Posts: n/a
Sorry to bring this subject back up, but im still getting back milage and i started reading this post again just to find out this,
Also add the coolant (engine) temperature sensor to your grocery list of items that may cause excessive fuel consumption.
...can anyone tell me where this is, cause i have no idea, well it's prolly on the block somewhere.

thanks a lot
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Old 08-03-2002, 11:28 AM
pmizell's Avatar
Benz Zealot
Join Date: Jun 2001
Location: Houston, Texas
Posts: 838
This EZL/KE temp sensor should be located on the very back of your head, closest sensor to the firewall. It is color coded BLACK and I think it's a two pin sensor.

If you have a multimeter you can test it: (resistance/ohms setting)

40c = 1.17 k ohms

60c = 0.60 k ohms

80c = 0.325 k ohms

If these readings are off, the sensor is sending bad signals to the KE control unit which would affect MPG.

If you've ever had oil in your coolant (blown head gasket), the sensors get contaminated and it's a good idea to change them out, or remove and clean them real well.

If you're really into DIY'ing I suggest you get a MB manual/CD's that describes the KEIII fuel injection system and all the variables that are involved in optimizing your fuel economy. It is relatively complex, compared to the rest of the 103 engine components. The best $30 investment I've ever made for my 300E is a digitial multimeter from Sears with duty cycle function. Comes in very handy. A "home brewed" pulse counter is great too, to read fault codes stored in your computer -- to give you a better idea of what's going on.

You can read Stevebfl's well written article under the DIY tab (engine management controls) but I don't think you'd get much out of it until you learn the basics of this system.

Here's what's involved, in a nutshell :

Good luck!
'01 E430, Sport 72,000 mi
'98 C280, 126,500 mi

Last edited by pmizell; 08-03-2002 at 11:36 AM.
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Old 08-05-2002, 12:13 PM
Registered User
Join Date: Apr 2002
Location: Hollywood Hills, CA
Posts: 891
hey any info like the above for the m104 engine?
~there is no spoon~

1984 300CD Turbo Diesel (soon to be "powered by VEGGIE") - dolphin silver

1999 e430 Sport blk/blk, my sexy ***** ;-)

(my other girls)
1992 300CE 24V 3.0L (w124) (R.I.P. "she was killed 7/12/03 by some ricer kids speeding in a honda accord")
1990 Acura Integra RS (w/94' engine)
1966 Cadillac Sedan de Ville (Hardtop)
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