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#1
10-08-2010, 02:10 PM
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Heat/Climat Control Issue
Lets see if anyone can make sense out of this one:
88 560 SL, 160K I have luke warm heat on start-up (on any of the vent selections) even when the coolant temp is up. I got gas the other day and when I started the car the heat was back; for about 10 minutes then luke warm again. So I shut it off at a stop light and the heat was back again, any ideas? Vacuum bleeding down? The blower is working all the time, just blowing warm air. This is a relatively new thing, the car has always had a great heater. Thanks! -John
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John 2001 ML 320 1988 560 SL 2009 Toyota Tundra TRD 1992 400 E (sold '07) (bought back, '13) 2008 ML 350 
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#2
10-09-2010, 08:58 AM
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could be heater core issue, or aux heat pump? ( not sure yours has one)
Is the line into the firewall hot? If not could be Tstat not functioning properly
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Ron 2015 Porsche Cayman - Elizabeth 2011 Porsche Cayman - Bond,James Bond Sadly MERCEDESLESS - ALways LOOKING ! 99 E320 THE Queen Mary - SOLD 62 220b - Dolly - Finally my Finny! Sadly SOLD 72 450SL, Pearl-SOLD  16 F350 6.7 Diesel -THOR 19 BMW X5 - Heaven on Wheels 14 38HP John Deere 3038E Tractor -Mean Green 84 300SD, Benjamin -SOLD 71 220 - W115-Libby ( my first love) -SOLD 73 280 - W114 "Organspende" Rest in Peace 81 380 SL - Rest in Peace
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#3
10-09-2010, 09:29 AM
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John,
When similar symptoms happend in my '87 560SL, it turned out to be a failing/sticking monovalve. $40 replacement part/15min job solved my problem. Bob
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Bob Jones Bradenton, FL '87 560SL-Sold '99 SL500 For Now
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#5
10-11-2010, 02:20 AM
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John,
I meant to ask you before, what happens when you turn the temp wheel to max? Also, what happens when you push the defrost button? Bob
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Bob Jones Bradenton, FL '87 560SL-Sold '99 SL500 For Now
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#6
10-18-2010, 04:25 PM
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Hi Bob,
Temp to max gives me colder air than temp just before max. Haven't tried the defrost. I unplugged the monovalve and now I have massive heat! -John
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John 2001 ML 320 1988 560 SL 2009 Toyota Tundra TRD 1992 400 E (sold '07) (bought back, '13) 2008 ML 350
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#7
10-18-2010, 07:48 PM
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R/R monovalve, that is the issue, heater core has been ruled out!
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Ron 2015 Porsche Cayman - Elizabeth 2011 Porsche Cayman - Bond,James Bond Sadly MERCEDESLESS - ALways LOOKING ! 99 E320 THE Queen Mary - SOLD 62 220b - Dolly - Finally my Finny! Sadly SOLD 72 450SL, Pearl-SOLD 16 F350 6.7 Diesel -THOR 19 BMW X5 - Heaven on Wheels 14 38HP John Deere 3038E Tractor -Mean Green 84 300SD, Benjamin -SOLD 71 220 - W115-Libby ( my first love) -SOLD 73 280 - W114 "Organspende" Rest in Peace 81 380 SL - Rest in Peace
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#8
10-20-2010, 04:36 PM
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Something else is going on here...
Set at Max, cool air? One notch before max, air is warmer... Unplugged monovalve, hot air... Set at Max is the same as pulling the plug from the monovalve, essentailly. When current is removed from the monovalve, the valvel defaults to OPEN, thus, heat. You have observed this... What does not pan out is that you did not get heat when set to max. Repairing the monovalve is a good idea for a number of reasons, if the system is old, but I do not think it is your problem. Sounds like, to me, you have a problem in the feedback circuit, in either your dash sensor, the evaporator sensor, or the climate controller itself. Similar issue has been discussed ad nauseum, on the "other" forum, http:///www.bewnzworld.org/forums. Good luck sorting it out...
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RM Smith 1988 560SL "Where is it again that we are going, and why are we in this handbasket"?
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#9
10-20-2010, 08:18 PM
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If the climate control unit was bad , I thought the default was all heat? You may be right now that I think about it , may be something else.But for less thatn $40 and 20 minutes work I'd start with monovalve
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Ron 2015 Porsche Cayman - Elizabeth 2011 Porsche Cayman - Bond,James Bond Sadly MERCEDESLESS - ALways LOOKING ! 99 E320 THE Queen Mary - SOLD 62 220b - Dolly - Finally my Finny! Sadly SOLD 72 450SL, Pearl-SOLD 16 F350 6.7 Diesel -THOR 19 BMW X5 - Heaven on Wheels 14 38HP John Deere 3038E Tractor -Mean Green 84 300SD, Benjamin -SOLD 71 220 - W115-Libby ( my first love) -SOLD 73 280 - W114 "Organspende" Rest in Peace 81 380 SL - Rest in Peace
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