S-Class (W140) 1991-1999: 300 SD, S 350TD, 300 SE 2.8, S280, 300 SE 3.2, 300 SEL 3.2, S320, S320L, 400 SE, S420, 400 SEL, S420L, 500 SE, S500, 500 SEL, S500L, 600 SE, S600, 600 SEL, S600L, 500 SEC, 600 SEC

Voltage to Duo valve

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Old 05-01-2008, 03:23 PM
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1995 S320 and 1995 S500
Voltage to Duo valve

I replaced the Duo valve twice and still no heat. Is the a issue with the computer or voltage to the duo valve?

Gman
Old 05-02-2008, 03:23 AM
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92 500sel/01 320e wag
The Duo valve is open by default, try and unplug, is there heat at the hoses?
Old 05-02-2008, 06:00 PM
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1995 S320 and 1995 S500
Ac control unit and duo valve!!!!!!1?

I took the car back to the dealer. They now tell me it is is both the AC Control unit and the DUO valve. They say the correct voltage not going to duo valve.

Any suggestions??????????????

Gman
Old 05-03-2008, 05:01 PM
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92 500sel/01 320e wag
I would find another dealer, or good independent, the duo shuts off the flow. I would think it would be stuck open since it needs power to close. you might take the other off your car and exchange them
Old 05-04-2008, 11:38 AM
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1995 S320 and 1995 S500
I agree

Can I forgo the a/c and just get heat? Also can the little motor or computer next to th duo valve be replaced (only read about this, never seen it)

I am in So-cal any ideas for an good AC independant?

Gman
Old 12-06-2009, 11:56 AM
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1995 S 420 w140
No Heat

Hey Gman. Did you ever solve your no heat problem? I've got a similar one, but only on the driver's side.

Thx,

Wade

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