Heater not making hot air

BudW · 05-23-2007, 08:15 PM

My dealer told me that I need to replace my "dual valve" on my '93 500SEL.

Hi, I am new. Name is BudW. Yeah, that W is for Wiser. Says so on my Visa cards.

So can my old, not working at all "Dual Valve" get reincarnated?

What about used "Dual Valves"? Who might sell these things?

Thanks all.

Pics later, I promise. Black is back!

BudW

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tirona · 05-25-2007, 08:29 PM

hi budw, sorry to hear about your dualvalve. read this thread from the w210 forum, somewhere in the first page they describe in detail how to clean the dualvalve, maybe yours needs just a cleaning. hope this helps.

http://www.benzworld.org/forums/w210...-cold-air.html

BudW · 05-27-2007, 01:08 AM

Thank you.

Your reference was very helpful.

Especially, helping me understand that I need a duo valve and not a dualvalve.

Oh my, age is catching up to me too fast.

BudW

brett san diego · 05-28-2007, 11:59 AM

Here is a rebuild of the rear climate control duovalve. The front climate control is very similar.

http://v12uberalles.com/Rear_AC_System.htm

Brett

BudW · 05-29-2007, 11:00 AM

Brett, I am IMPRESSED. Alas, I must admit to be a clutz when it comes to such detail but I have been inspired to see if I can actually do a remove and replace using a used duovalve from Potomac German Auto. They sell my duovalve for $239. If I do manage to install it (front heater controls) then I avoid the $900 the local Mercedes dealer wants for the job.

Thanks again. Without your help, I would be out $900 for sure.

BudW

tirona · 05-29-2007, 11:36 AM

$239 for the duovalve is pretty good. those little *******s are expensive, i think new they are like $500.

brett san diego · 06-01-2007, 01:58 AM

Quote:

Originally Posted by BudW

Brett, I am IMPRESSED. Alas, I must admit to be a clutz when it comes to such detail but I have been inspired to see if I can actually do a remove and replace using a used duovalve from Potomac German Auto. They sell my duovalve for $239. If I do manage to install it (front heater controls) then I avoid the $900 the local Mercedes dealer wants for the job.

Thanks again. Without your help, I would be out $900 for sure.

BudW

The duovalve rebuild is not my work. That is the site owner's (Pete, pcmaher) own work. I've just contributed some articles on some work that I've done on my own S600.

Brett

jpayton · 12-26-2011, 03:12 PM

Quote:

Originally Posted by brett san diego

Here is a rebuild of the rear climate control duovalve. The front climate control is very similar.

http://v12uberalles.com/Rear_AC_System.htm

Brett

Very nice write up. I have 99 s420 that is not producing heat. I check the duo-value motor with a batter and I can hear it run. I check each of the duo-value circuits and I can hear them actuate. I checked the fuse and they are good. Still no heat. What else should I check?

vdubpower · 12-30-2011, 02:57 AM

hmm i need to check mine, jsut posted about this issue too

tbilisi79 · 01-11-2012, 09:10 AM

I remember when my DUO VALVE gave out, I said THATS IT. Sold her and never looked back.
I couldn't believe a 100k dollar car could fall apart so fast.

Designers must have had manure for brain. 1 billion spent in developing a car whose climate control hardly ever works,window regulators give out.

Lesson learned, never buy a German car....LEASE!!! MB has abandoned the idea of building long lasting cars a while ago. Now they are into making 2000HP tire burners that last the duration of the lease.

Good luck with fix!

12-30-2011, 02:57 AM	#9
vdubpower MBWorld Fanatic! Garage is empty, add now Join Date: Dec 2003 Location: The Valley, City of Angels---> Back to the OC Posts: 2,079 Drives: i drive them all, fast and hard	hmm i need to check mine, jsut posted about this issue too __________________ 1985 500SEL Euro Nautic Blue - A Classic Beauty 1998 S500 Brilliant Silver 2001 S500 Almadine Black/AMG Sport Package - Smooth and Silky 2010 S550 Palladium Silver/AMG P2 - Refined and Luxurious 2005 C320wz Granite Grey/Fully Loaded - Sold and Missed already 2012 E63 AMG Iridium Silver - Performance Package

01-11-2012, 09:10 AM	#10
tbilisi79 Junior Member Garage is empty, add now Join Date: Aug 2005 Posts: 69	I remember when my DUO VALVE gave out, I said THATS IT. Sold her and never looked back. I couldn't believe a 100k dollar car could fall apart so fast. Designers must have had manure for brain. 1 billion spent in developing a car whose climate control hardly ever works,window regulators give out. Lesson learned, never buy a German car....LEASE!!! MB has abandoned the idea of building long lasting cars a while ago. Now they are into making 2000HP tire burners that last the duration of the lease. Good luck with fix! __________________ 88 LSC Black-5speed, TFS heads, 14.1-99mph R.I.P 90 LSC Black-5-speed LSC 95 Mark VIII 96 Mustang GT 'Vert 93 MB 500SEL 98 Lexus LS400 73 Mark IV ----------------------------------- 92 LSC. 98 LSC. 07 Lexus GS430.

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05-25-2007, 08:29 PM	#2
tirona Senior Member Garage is empty, add now Join Date: Apr 2007 Posts: 278 Drives: 1997 s320, 1997 e320	hi budw, sorry to hear about your dualvalve. read this thread from the w210 forum, somewhere in the first page they describe in detail how to clean the dualvalve, maybe yours needs just a cleaning. hope this helps. http://www.benzworld.org/forums/w210...-cold-air.html

05-27-2007, 01:08 AM	#3
BudW Almost a Member! Garage is empty, add now Join Date: May 2007 Location: Orange, CA Posts: 27 Drives: 1993 500SEL	Thank you. Your reference was very helpful. Especially, helping me understand that I need a duo valve and not a dualvalve. Oh my, age is catching up to me too fast. BudW

05-28-2007, 11:59 AM	#4
brett san diego Member Garage is empty, add now Join Date: Apr 2004 Posts: 105 Drives: 1997 S600 Sedan	Here is a rebuild of the rear climate control duovalve. The front climate control is very similar. http://v12uberalles.com/Rear_AC_System.htm Brett

05-29-2007, 11:00 AM	#5
BudW Almost a Member! Garage is empty, add now Join Date: May 2007 Location: Orange, CA Posts: 27 Drives: 1993 500SEL	Brett, I am IMPRESSED. Alas, I must admit to be a clutz when it comes to such detail but I have been inspired to see if I can actually do a remove and replace using a used duovalve from Potomac German Auto. They sell my duovalve for $239. If I do manage to install it (front heater controls) then I avoid the $900 the local Mercedes dealer wants for the job. Thanks again. Without your help, I would be out $900 for sure. BudW

05-29-2007, 11:36 AM	#6
tirona Senior Member Garage is empty, add now Join Date: Apr 2007 Posts: 278 Drives: 1997 s320, 1997 e320	$239 for the duovalve is pretty good. those little *******s are expensive, i think new they are like $500.

01-11-2012, 09:10 AM
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