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mercedes benz 1979 450sl
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16 Posts
Discussion Starter · #1 ·
The blower works under passenger dash. air blows thru defrost setting and bi level setting. air also blows thru side vents and from both floor vents. air just does not get warm at all. this is with ac set in off position and when climate control wheel set on 80. i have checked the vacum all seems functional. will check to see if hoses get warm in a.m.
 

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1986 560SL with M120 V12 Engine, 1988 560SL Stock
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14,979 Posts
The blower works under passenger dash. air blows thru defrost setting and bi level setting. air also blows thru side vents and from both floor vents. air just does not get warm at all. this is with ac set in off position and when climate control wheel set on 80. i have checked the vacum all seems functional. will check to see if hoses get warm in a.m.
Not sure if you have a mono valve and aux heater pump but if you do they need to be checked.
 

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mercedes benz 1979 450sl
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16 Posts
Discussion Starter · #5 ·
This morning all hoses running to servo got hot with defrost running. I noticed however when i pushed bi-level button i could hear it switch over but was not blowing out. when I pushed back to defrost it ran and blew out well.
Also AC works great except does not blow out through middle vents. This just stopped happening the other day when I started looking for the heater problem. Any more ideas. All replies are appreciated.
 

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mercedes benz 1979 450sl
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16 Posts
Discussion Starter · #6 ·
Update: I pulled off the climate control plate and unplugged. Though limited vision I could not see anything unplugged or hoses unplugged. Strange however that when i replugged it back together the middle vents started blowing air and the bi-level button worked when I switched ac mode on. Then would not work when i switched if off of AC.Still however no hot air. Still working on it....
 
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