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  #1  
Old 03-21-2001, 07:27 AM
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Location: Soperton, Ga. USA
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The heater in my 300D blows hot air when I am stopped at a red light or stop sign but when i start going again it blows air that is not too hot. Has anyone ever seen this problem and what was it? On really cold mornings I try to catch the red lights to warm up some.
thanks,
Jim
'85 300D
'95 E320
'97 CRV
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  #2  
Old 03-21-2001, 09:14 AM
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Check the mono valve capsule. It is easily removed from the top of the water control valve by removing the four small screws. The diaphram gets torn and does about what you are saying.

Also be sure your engine is heating all the way (thermostat).
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  #3  
Old 03-21-2001, 02:15 PM
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Location: Santa Clara, CA
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There is a monovalve repair kit available from PartsShop, very easy to change out and should definitely help. Your water circulation pump might also be a minor contributor, but fix the monovalve first.
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'76 240D-Sold
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'85 300 SD, 165K-Sold
'88 300 TE, 165K-Sold
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  #4  
Old 03-21-2001, 05:11 PM
NIC
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Steve/Ron:

My '85 300CD does the same so I'd like to try the monovalve repair. Only problem is I know not where it is. Can you tell me in lay terms how to access it? I'm competent with tools but no mechanic.

Nic in SC
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  #5  
Old 03-21-2001, 05:31 PM
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The monovalve (heater water control valve) is located on the firewall next to the battery. It is plastic with two coolant hoses going to it. It has 4 small screws holding the wire coil and capule in from the top. Be carefull when removing the capsule from the wire coil as the connection to the two wire connection is fragile. BTW the part# for the capsule is 000 835 06 44.
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  #6  
Old 03-21-2001, 05:36 PM
NIC
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Thanks Steve, I'm ordering right now. I can handle this.

Nic
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  #7  
Old 03-21-2001, 06:47 PM
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Best to pull it when the coolant is cool, and certainly when it is not under pressure.
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'76 240D-Sold
'78 240D-Sold
'85 300 SD, 165K-Sold
'88 300 TE, 165K-Sold
'64 Porsche 356C Cabriolet
'86 560SL 124K Miles
'94 320E Wagon, 74K Miles-128K Miles JUNKED
'06 E350 Wagon, 84K Miles
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  #8  
Old 03-21-2001, 08:41 PM
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thanks everyone

I will put it on my "to-do" list. Seeing as how this is my "project" car it already has quite an extensive list. I will more than likely take care of it prior to next years cold spell. I am already in the process of getting the A/C working. Will be installing a rebuilt compressor and dryer this weekend. I do not want to get too far into May without A/C.
Jim
'85 300D
'95 E320
'97 CRV
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  #9  
Old 03-22-2001, 09:26 AM
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Jim,

Don't use a rebuilt compressor on that car; a new R-4 can be purchased through your local AC/Delco (Delphi) dealer for a little over 200. There is no percentage to using reuilt when OEM new is that cheap.
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  #10  
Old 03-22-2001, 04:11 PM
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You are the second person

to tell me that Steve. The other guy is the one that is going to charge it after I replace the comp. The difference in cost was $110 so I went ahead and exchanged the rebuilt for a new one. The rebuilt one was $100 and the new one was $210.
thanks,
Jim
'85 300D
'95 E320
'97 CRV
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  #11  
Old 03-22-2001, 04:26 PM
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Good Job!!
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Steve Brotherton
Continental Imports
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33 years MB technician
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  #12  
Old 03-26-2001, 08:35 AM
NIC
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Jim and all,

I took the old monovalve out this weekend and sure enough, the rubber diaphram was torn. Replaced it with one from Fast Lane. Now my heater works uniformly whether I'm driving of idling.

Not much trouble. Kind of hard to get at screws in back. Took about 15 minutes.

Thanks for advice.

Nic
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  #13  
Old 04-03-2001, 07:52 AM
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Join Date: May 2000
Location: Soperton, Ga. USA
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I installed the new monovalve

assembly last night (came from Fastlane.com). Sure enough the old diaphragm was torn. I will finish putting everything back together this evening and should have heat the next time I run it. Thanks for the help everyone.
Jim
'85 300D
'95 E320
'97 CRV
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