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Old 08-12-2003, 11:28 AM
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csnow csnow is offline
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Join Date: May 2002
Location: Mass
Posts: 1,127
I wonder if it could be the mono valve.
I recently unplugged mine for debugging purposes, and found hot air blew through the defog and side vents even with the climate control totally off. Open may be its 'default' state.
I suppose you could test this theory by crimping off the heater hose temporarily. I have special pliers for this purpose, but vise-grips with suitable padding works too, particularly the needle-nose type.
Good luck.

1986 300E 5-Speed 240k mi.
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