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Same problem
My '88 Camry 4cyl. auto has developed the same problem. The heat will stay on very steady for the first half hour or so. Then it will just randomly decide to switch off on me. It is a sudden shift, like someone was throwing a switch. I figure that one of the vent flaps is losing its seal and falling down, bypassing the heater core and letting in the cold air from outside. Has anyone had this problem and fixed it? How is it fixed?
Sometimes I can get it to come back on for a while if I push the button for outside venting real hard, or I can get it to come back on for a while by hitting the dashboard real hard a couple times,
Any ideas for a permanent fix? It is very cold in Michigan right now.
Thanks,
Dave
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