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Old 01-24-2011, 01:20 AM
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Join Date: Dec 2008
Location: shingle springs, ca
Posts: 100
W140 Heater Valve Question

I have a 92 S320 that the heater stopped working. I took apart the duo valve and found the problem but was not able to "repair" it. I made it so it is just HOT. Control the temp by off/on and fan speed.
But the more I look into this the more I become curious and since there is no manual for these beasts I was wondering if anyone could answer a question for me.
My duo/dual/heater valve has 5 hoses coming off of it. 1 goes in and 4 come out. Without completely dismantling the firewall and tracking these hoses, can someone tell me what the 4 out-going hoses go to?

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