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One is the mode switch and the other is the temp control switch. Do this, start the engine then open the hood and listen for a hiss indicating a vacuum leak on the vacuum reservoir or a broken hose going to the heater control the hoses on this vehicle have to be very brittle by now so get some vacuum hose and have at it I think the vacuum reservoir may be mounted to the hood. I hope this helps. Take care. If this isn't it you can use testimonial to contact me with questions.
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