Originally Posted By NANKET
... there is no shut off valve. Only a hot cold blend door in the heater box.


Thanks, .. yes this is what my FSM shows, and AFAIK the blend door works cuz the lever arm moves freely and I can hear the door inside sort of slam against its stops when I operate the cold/hot selector lever.. and it's a very original car ...but ya never know if a PO could have rigged something weird, I'll check for it anyway..

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