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#1
07-11-2006, 10:44 AM
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190e 2.6: Cold eng., cold a/c, warm eng., warm a/c
I suspect that heated air is getting in and mixing with the cooled air. (The a/c system seems fine; condenser works, plenty of charge.) This car does not have the monovalve, the failure of which would have explained this failure on other cars. I've searched on here and can't figure out how this mixture works on this car, or where to find the valve or other device that controls it. Thanks in advance for help!
The car is a 1991, though I doubt this matters... 
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#2
07-11-2006, 04:03 PM
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At first I thought it strange that a 103 motor had no monovalve. I then looked up the heater valve for your car and sure enough.
Look at the photo of it below. Picture on the left has what appears to be a vacuum hose connection on top. Vacuum issue or perhaps the valve is defective? Just my 2 cents. http://catalog.eautopartscatalog.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=1U40N9POF1UI0W5PAW&year=1991&make=MB&model=190-E-005&category=R&part=Heater+Valve
__________________
Mike Murrell 1991 300-SEL - Model 126 M103 - SOHC "Fräulein"
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#3
07-11-2006, 04:47 PM
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Yep check the heater valve. It is located on the passenger side under the debris screen under the wiper.
__________________
~Jamie _________________ 2003 Pewter C230K SC C1, C4, C5, C7, heated seats, CD Changer, and 6 Speed. ContiExtremes on the C7's. 1986 190E 2.3 Black, Auto, Mods to come soon.....
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#5
07-12-2006, 12:11 PM
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190-heater valve
now that you know where the valve is,first get a hand crank vacuum pump and attatch to vac conn on valve.see if holds vac.if not replace.if it holds leave pump attached and drive car to see if problem cured. if ok then you will find under glove box a set of vac valves that controls all of heat and ac.once you establish that good vac is coming into valve set you will need to replace valve set.they cannot be fixed. david poole e.p. dallas tx.
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#6
07-12-2006, 02:56 PM
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And I have a nice brand new one in my tool box that I never needed. Let me know when you are done testing if you want it and I will send it too you for a few bucks.
__________________
~Jamie _________________ 2003 Pewter C230K SC C1, C4, C5, C7, heated seats, CD Changer, and 6 Speed. ContiExtremes on the C7's. 1986 190E 2.3 Black, Auto, Mods to come soon.....
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