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#1
08-05-2011, 10:06 AM
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84 300SD A/C vent Defrost HOT same time
I have a friend with a 84 300SD that blows cold A/C through the vents but also runs the defrost at the same time.
Just a note the defrost is HOT and in Florida at this time of year that is not a good thing.  Any ideas?
__________________
Moss Gate Bed & Breakfast 1985 300 TD GG done in by a red light runner  1984 300 CD Sold  2008 Titian 2000 Cadillac SLS 1966 FLH Sold 2003 Harley Ultra 
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#2
08-05-2011, 10:24 AM
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Why would you need to use Defrost in Florida in the summer?
Considering that Defrost is intended to melt frost/ice, why wouldn't it be hot? Quote:
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#3
08-05-2011, 10:42 AM
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I believe a leaking monovalve would cause such a problem. In A/C mode, check for power at the monovalve and check for a good ground as well. It may have a failure, internally, and be bypassing coolant to the heater core.
Is the air coming from the defrost blowing full blast air or just slightly? If it seems to be full blast, the vacuum pod for the diverter flap may be leaking. The pod for this is located behind the instrument cluster.
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Sam 84 300SD 350K+ miles ( Blue Belle )
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#4
08-05-2011, 10:45 AM
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Quote:
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#5
08-05-2011, 01:04 PM
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... so there's no defogging option for defrost position on these cars?
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!!  1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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#6
08-05-2011, 01:10 PM
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Quote:
Defrost just fogs up the windshield a lot worse, initially. Defrost can actually be quite hazardous if turned on while driving.
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