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  #1  
Old 07-15-2007, 01:34 AM
MangoMan's Avatar
Diesel Lover
 
Join Date: Jul 2007
Posts: 19
How to turn off water flow to 75 240D heater core?

I can't get the heat to stop drifting in to the cabin for the life of me. When it's 100+ out this is not really all that fun. Does anyone know which way to turn the heater control assembly to turn the heater core flow off?

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  #2  
Old 07-15-2007, 01:36 AM
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Join Date: Mar 2007
Location: Tampa, FL
Posts: 271
I don't know anything about the 240D... does it have the monovalve or was that before it's time?

If it has a mono then jumper it to 12 volts and see if it actuates... if it does then you have a ccu problem, if it doesn't... do what I did and replace it with a ball valve until you can get your monovalve fixed
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  #3  
Old 07-15-2007, 02:16 AM
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Maybe I just don't know which way to turn the dash control arms for no heat. There are no labels or anything to go off of.
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  #4  
Old 07-15-2007, 02:20 AM
ForcedInduction
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Look something like this?
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  #5  
Old 07-15-2007, 02:54 AM
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Join Date: Jul 2007
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Exactly! Hehehe, now what is supposed to be heat off? What is yours set to right there in the pic? I don't have an owners manual with this tractor
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01 ML320 Auto White 95k "The Wife's"
75 240D Manual Yellow 57K "My baby"
84 300D/T Auto Gold 120K "Now my brothers"
84 300D/T Auto Silver 300K "Totaled"
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  #6  
Old 07-15-2007, 03:11 AM
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The bottom two levers are the driver and passenger side heat controls. Slide both toward the center (towards each other) for the coolest air, and toward the doors (away from each other) for full heat.
Top left control is for dashboard/defrost ventilation and top right is for floor; again, slide them toward each other to cut off most of the air flow. You can also flip the switch on the round vents at the ends of the dask to shut off airflow there, and the switch for the center square vent (very top center of dash) open (can't remember now if it's left or right, but easy to tell) to bring in fresh outside air. I find this is the nicest in the summer and brings cool enough air in unless it's really hot outside.
If you have air conditioning, turn the green knob below (that says "colder") to switch it on. Mine doesn't work; reportedly the A/C on a 240D saps enough horsepower to make it almost impossible to drive up hills with it on.
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  #7  
Old 07-15-2007, 04:22 AM
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Very nifty and I appreciate you answering my questions! This has to be the best Mercedes forum ever! I bought a Lexus POS a few months back and just sold it, best thing I ever did. Mercedes are the "scheißen" hands down.
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01 ML320 Auto White 95k "The Wife's"
75 240D Manual Yellow 57K "My baby"
84 300D/T Auto Gold 120K "Now my brothers"
84 300D/T Auto Silver 300K "Totaled"
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  #8  
Old 07-15-2007, 05:13 AM
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Join Date: Oct 2004
Location: Marietta, GA
Posts: 3,511
Check the wire levers in the engine bay attached to he firewall which control the dual range heat sometimes they are oxidized and cause binding causing some serious effort to move those temp and vent sliding knobs.
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  #9  
Old 07-16-2007, 03:09 AM
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Diesel Lover
 
Join Date: Jul 2007
Posts: 19
Thanks got it turned of the engine compartment pipe clamps were keeping the valves from closing all the way. Kudos diametricalbenz!

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01 ML320 Auto White 95k "The Wife's"
75 240D Manual Yellow 57K "My baby"
84 300D/T Auto Gold 120K "Now my brothers"
84 300D/T Auto Silver 300K "Totaled"
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