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Cabin temp
Where or what can I troubleshoot for lack of heat control. No matter where I positioned the temp setting on the control, all I get is hot air. Even after the turn the system off I still feel hot air coming from the vents, mainly the vents on the side towards the window.
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1984 300D, 1972 LT1 Corvette, 2014 Artic White 3LT/Z51 C7, 2013 650i Convertible BMW, 1994 Kawasaki Vulcan, 1992 Yamaha Seca II and 1996 Dodge Ram 2500. |
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"Senior Luna, your sense of humor is still loco... but we love it, anyway." -rickymay ____ "Your sense of humor is still loco... " -MBeige ____ "Señor Luna, your sense of humor is quite järjetön" -Delibes 1982 300SD -- 211k, Texas car, tranny issues ____ 1979 240D 4-speed 234k -- turbo and tuned IP, third world taxi hot rod 2 Samuel 12:13: "David said to Nathan, “I have sinned against the Lord.” And Nathan said to David, “The Lord also has put away your sin; you shall not die." |
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There are a few items that can cause this:
1) Bad vacuum pods 2) push button unit problems (cold solder joints) 3) temperature regulator control unit problems 4) Monovalve problems. 5) vacuum leaks I'd start by checking your monovalve. Pull the cartridge, make sure theres no holes in the rubber diaphragm. Next I'd check the vacuum pods. Make sure they are all holding vacuum.
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Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out. Check here for compatibility, diagnostics, and availability! (4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!) 82 300SD 145k 89 420SEL 210k 89 560SEL 118k 90 300SE 262k RIP 5/25/2010 90 560SEL 154k 91 300D 2.5 Turbo. 241k 93 190E 3.0 235k 93 300E 195k |
#4
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Vacuum controls air distribution. Temperature control is accomplished electrically, through the monovalve.
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When cryptography is outlawed, bayl bhgynjf jvyy unir cevinpl. |
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Yes I know this. OP said even after the system is he getting air at vents. That suggest (at least on a 124 or 126..not 100% sure on a 123) that the air scoop vent pod is either bad or not being controlled properly.
__________________
Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out. Check here for compatibility, diagnostics, and availability! (4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!) 82 300SD 145k 89 420SEL 210k 89 560SEL 118k 90 300SE 262k RIP 5/25/2010 90 560SEL 154k 91 300D 2.5 Turbo. 241k 93 190E 3.0 235k 93 300E 195k |
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Not sure where the "monovalve" is located. Do you have a photo of it?
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1984 300D, 1972 LT1 Corvette, 2014 Artic White 3LT/Z51 C7, 2013 650i Convertible BMW, 1994 Kawasaki Vulcan, 1992 Yamaha Seca II and 1996 Dodge Ram 2500. |
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Quote:
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Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out. Check here for compatibility, diagnostics, and availability! (4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!) 82 300SD 145k 89 420SEL 210k 89 560SEL 118k 90 300SE 262k RIP 5/25/2010 90 560SEL 154k 91 300D 2.5 Turbo. 241k 93 190E 3.0 235k 93 300E 195k |
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1984 300D, 1972 LT1 Corvette, 2014 Artic White 3LT/Z51 C7, 2013 650i Convertible BMW, 1994 Kawasaki Vulcan, 1992 Yamaha Seca II and 1996 Dodge Ram 2500. Last edited by WMO Madness; 04-28-2014 at 03:41 PM. |
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Remember the mono valve is electrically operated such that
- no voltage = full flow - full votage = no flow The fused +12 V dc from the climate control circuit connects directly to the monovalve, and the controller switches the grounded side of the coil. Therfore if you measure voltage you should always see +12 V dc on the coil at least on one side. To provide proportional control of the temperature the voltage is switched on and off with varying duty cycle. The less "on" time, the warmer the heater will become. When the controller tells the monovalve to close, the controller grounds the wire coming from the other side of the monovalve coil. In this case you can see the voltage going between 12 V (controller says valve open) and nearly 0 V (controller says valve closed). Putting the dial on MIN temperature results in constant ground (i.e. 100% duty cycle) and putting the dial on MAX results in no ground (i.e 0% duty cycle). The thermal mass of the heat core smooths out the pulsed operation.
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The OM 642/722.9 powered family Still going strong 2014 ML350 Bluetec (wife's DD) 2013 E350 Bluetec (my DD) both my kids cars went to junkyard in 2023 2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles) 2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles) 1998 E300DT sold to TimFreeh 1987 300TD sold to vstech |
#11
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Quote:
That is correct in the case of specific modes and not correct in others.
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When cryptography is outlawed, bayl bhgynjf jvyy unir cevinpl. |
#12
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If however the controller puts a ground on the other side of the coil, the voltage on the controlled side of the coil will go to zero (or very nearly so, it depends on whether it's a relay (123/early 126) or solid state switch (124/late 126/210). I have been an industrial controls engineer for the past 25 years. I see this in practice every day if we lose a neutral on a relay coil in a control panel. We normally switch the "hot" side, so if we have the switch 'on' and the relay not pulled in, and I read line voltage on both sides of the coil, it's time to find the bad neutral. If you ever talk to an electrician, they will likely tell you the worst time they got shocked is off the neutral wire, where they opened the connection between the panel and a load, and got their hand in between the two wires. There is definitely full voltage on the load side of the neutral when measured against the panel neutral. That is correct. I should have been more clear. This operation is true when either the "hi-lo", "normal" or "EC" buttons are pushed. This is the 3 buttons in the center of the 5. "Off" grounds the monovalve to keep it [edit: shut], and "defrost" removes the ground so it is maximum heat.
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The OM 642/722.9 powered family Still going strong 2014 ML350 Bluetec (wife's DD) 2013 E350 Bluetec (my DD) both my kids cars went to junkyard in 2023 2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles) 2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles) 1998 E300DT sold to TimFreeh 1987 300TD sold to vstech Last edited by jay_bob; 04-28-2014 at 10:27 PM. Reason: Last sentence, I'm used to electrical "closed" means on and "open" means off |
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Quote:
Again thank you for the education.
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1984 300D, 1972 LT1 Corvette, 2014 Artic White 3LT/Z51 C7, 2013 650i Convertible BMW, 1994 Kawasaki Vulcan, 1992 Yamaha Seca II and 1996 Dodge Ram 2500. |
#14
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With the engine cold remove the four screws on top and look inside. If it s flooded above the diaphragm, get a repair kit and just slip in a new diaphragm/plunger.
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2001 SLK 320 six speed manual 2014 Porsche Cayenne six speed manual Annoy a Liberal, Read the Constitution |
#15
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I removed the Mono valve today and inspected it for damaged, the diaphragm look good. so I applied power to the valve, it actuated like a electric shut off valve. The latest symptom is, full hot hair when before I was able to control it specially after I got the A/C fixed. Even when the A/C is on the cold is not overriding the warm air coming out.
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1984 300D, 1972 LT1 Corvette, 2014 Artic White 3LT/Z51 C7, 2013 650i Convertible BMW, 1994 Kawasaki Vulcan, 1992 Yamaha Seca II and 1996 Dodge Ram 2500. |
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