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#1
11-24-2008, 05:19 PM
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300SE - Low heat. SOLVED!!
It turned out to be the monovalve solenoid after all. Put the new one in and the result was dramatic.
Thanks for all your help!!! I have a '90 300SE. The interior heat works a little, but not very well. It takes a very long time to get the heat, and the air just blows warm, never hot. If I park the car for a few minutes and get back in, the air coming out is significantly hotter, but then it cools back down to lukewarm very quickly. I've replaced the thermostat with a brand new one from the dealer, so that's not the issue. Also, the air mainly comes through the defroster and very little through the main vents. Any ideas? Thanks, tinypanzer Last edited by tinypanzer; 11-26-2008 at 07:17 PM. 
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#2
11-24-2008, 05:36 PM
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Have you checked the monovalve solenoid's diaphragm?
__________________
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]
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#3
11-24-2008, 05:50 PM
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To answer your question, no I haven't checked that.
Where is it located and how difficult is it to check? Any special tools needed like a hand pump or anything? Thanks!!
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#4
11-24-2008, 05:54 PM
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Quote:
A flat head screwdriver and a beer would be fine.  Look just to the right of the wiper fluid tank, there's a small deal (monovalve itself) with a dual pin plug. Unscrew the four screws and pull the electronic solenoid out. Check the rubber on the flip side.
__________________
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]
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#5
11-24-2008, 06:01 PM
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I'll go do that in a minute! Thanks for the help.
Should I expect coolant to gush out when I pull out this solenoid? Thanks, tp
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#6
11-24-2008, 06:19 PM
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Quote:
Nope, maybe a few drops only.
__________________
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]
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#7
11-24-2008, 06:49 PM
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The diaphragm like item is the one you don't want to go bad (tear/rip) in the summer.
The screen being clean now, ought to make an improvement.
__________________
It is a truism that almost any sect, cult, or religion will legislate its creed into law if it acquires the political power to do so. Robert A. Heinlein 09 Jetta TDI 1985 300D
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