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Sounds like the monovalve to me... It is probably ripped. you can get a new insert to fix this quickly. The other thing it could be is the small fan that samples air from the cabin. There is a hose that runs from the opening to the sampler fan. If the hose crumbles then the sampler draws warmer air from under the dash and cuts the heat. Do a search on this and you will see what I mean.
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"I have no convictions ... I blow with the wind, and the prevailing wind happens to be from Vichy"
Current
Monika '74 450 SL
BrownHilda '79 280SL
FoxyCleopatra '99 Chevy Suburban
Scarlett 2014 Jeep Cherokee
Krystal 2004 Volvo S60
Gone
'74 Jeep CJ5
'97 Jeep ZJ Laredo
Rudolf ‘86 300SDL
Bruno '81 300SD
Fritzi '84 BMW
'92 Subaru
'96 Impala SS
'71 Buick GS conv
'67 GTO conv
'63 Corvair conv
'57 Nomad
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