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Heat to Vent Problem

9098
in 1990 to Present Legacy, Impreza, Outback, Forester, Baja, WRX&WrxSTI, SVX

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I tried the search function but no dice. I'm sure this is common, so here goes:

1990, Legacy L has a Cabin Air control Assembly that Sticks in the last mode it was in. If I let the car get up to temp and leave the fan on high....I can eventually get it to switch from Def/Heat to Vent or whatever by tapping on the dash with some force. The Haynes manual just says to put in a new assembly. Is there a microswitch that can be cleaned to avoid this? How much would a new assembly cost? It looks like it's not that difficult to change.

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