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1987 780 Automatic climate controls not turing fan on. 700

I have a 1987 780 with the automatic climate control and when its cold out the function wont turn the fan on, but only on defrost. Once its a little warmer out 65F or thereabouts the fan comes on for the other functions. It will not work at all or I hear clicking down under the glove box area, so I am assuming there is a relay there? Can I just fix that or is there a module that controls the fan?






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