Where is the emissions box?

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1998 E300Turbodiesel
1980 300d

Ready- Ronnie

The computer compartment. Passenger side.

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Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)

Hi Guys,

I pulled the Monovalves and the whole Heater valve assmby and I noticed the bottom part of the valve (where the brass plungers go down) is not a smooth seal.

What parts should I grease up to see if it works?

Is there a way to rig it up where I dont get ANY hot antifreeze to the heater ( so my AC will work).

Im in FL and I dont really care about a heater but at over 100F I need a working AC!!

Here are some pics.

Pls let me know what I can do.

thanks

Attached Thumbnails

         

Hopefully the problem has already been fixed.
I had the same problem as originally described in this thread in my 1999 E300 Turbodiesel. Changed the Duovalve and it has been great since that was done about 18 months ago at approx. 235,000 miles.
Ken

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2014 E250 Bluetec 4-Matic
2014 GL350 Bluetec 4-Matic
1996 Chevy Tahoe 4 x 4
2009 ML350 (sold)
2005 SLK350 (sold)
1999 E300 Turbodiesel (sold)
1998 ML320 (sold)
1991 300D 2.5 Turbodiesel (sold)

The way to tell for sure if the problem is the duovalve is to put a clamp on the pipe from the valve to the engine. Then you will have no coolant flowing to the heater cores.

If the vents are the same (cold) temperature, the AC is fine and the problem is in the heater.

Left side still much warmer than the right? You have low refrigerant flow, caused by insufficient fill, a restriction, or contaminants like air or too much oil.

I had same problem beginning of summer, Freon was fine.
All i did clean that Monovalves and Cold AC since then.

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1999 W210 E300 Turbodiesel

Mine was low freon.. as yall said.. but putting the cans in didnt work.. I had to have it sucked out and put back in.. I was down 1.5 lbs.

It was about 85 bones... and now I have AC in FL in the summer...

THat is the up side.. Down side is that they used the sniffer and found a few small freon leaks... so no clue how long the freon will last. BUMMER.