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#1
01-02-2011, 10:46 PM
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W140 No Heat! A/C Works!
I have a 92 S320 that will not give me any heat whatsoever. Blower works great and even delivers air where I want it but will not get warm. The A/C works great.
I have a 5 hose duo valve but not sure how to test it to see if it is working. I have found a lot of info about the mono valves. How can I test the duo valve to determine that that's the problem before I spend $200 on a used one or $450 on a new one?
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1987 350SDL Parts Car 1987 350SDL #2 Sons Car 1991 350SD My Car-RIP 9/7/09 1992 300SD Her Car 1995 E300 Spare Car-RIP 4/23/09 1992 S320 My Car - Soon to be diesel 1990 W250 4x4 Cummins #1 Son's Truck 1993 D350 Cummins My Truck 1999 3500 Cummins Just Another Truck 1987 Executive Cat 3208 Family Wagon "Growing up is a choice. Growing old is a privilege" 
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#2
01-03-2011, 08:17 AM
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Try unplugging the electrical connector from the duo valve & then slightly tap on the side of each of the valves.. leave unplugged.
__________________
MERCEDES Benz Master Guild Technician (6 TIMES) ASE Master Technician Mercedes Benz Star Technician (2 times) 44 years foreign automotive repair 27 Years M.B. Shop foreman (dealer) MB technical information Specialist (15 years) 190E 2.3 16V ITS SCCA race car (sold) 1986 190E 2.3 16V 2.5 (sold) Retired Moderator
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#3
01-03-2011, 03:36 PM
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Unplugged it and tapped on both sides of the duo valve. Still didn't work.
I continued to search this forum for a DIY on the duo valve and found one!! I have been outside taking it apart for the last 2 hrs and have found that the rubber seats are actually in very good shape. But one valve had a large flat piece of rubber stuck in it and the other valve was frozen. I got the one unfrozen and it seems to have rusted in place. I cleaned off the magnet head with 100 grit sand paper. Cleaned the rest of the module and will get it back together after lunch. I will let you know how/if it works. I had absolutely nothing to loose but time....and that's cheap.
__________________
1987 350SDL Parts Car 1987 350SDL #2 Sons Car 1991 350SD My Car-RIP 9/7/09 1992 300SD Her Car 1995 E300 Spare Car-RIP 4/23/09 1992 S320 My Car - Soon to be diesel 1990 W250 4x4 Cummins #1 Son's Truck 1993 D350 Cummins My Truck 1999 3500 Cummins Just Another Truck 1987 Executive Cat 3208 Family Wagon "Growing up is a choice. Growing old is a privilege"
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#4
01-03-2011, 08:28 PM
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Partial Fix Duo valve
Well, I completely disassembled the duo valve. Not a difficult job at all. It's to bad there is no repair kit for these.
Now I have heat to the driver's side only. One of the "umbrella" plungers was frozen in the bottom seal, it was the same one that had the head of the plunger rusted in the cylinder. The next nice day I have I will just remove the "umbrella" plungers all together and then have uncontrollable heat.
__________________
1987 350SDL Parts Car 1987 350SDL #2 Sons Car 1991 350SD My Car-RIP 9/7/09 1992 300SD Her Car 1995 E300 Spare Car-RIP 4/23/09 1992 S320 My Car - Soon to be diesel 1990 W250 4x4 Cummins #1 Son's Truck 1993 D350 Cummins My Truck 1999 3500 Cummins Just Another Truck 1987 Executive Cat 3208 Family Wagon "Growing up is a choice. Growing old is a privilege"
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