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Re: Vintage air, radiator cooling fans
The high and low fan speeds are controlled by the PCM based on engine temperature. For A/C, the fans should be controlled by a trinary switch so they come on based on head pressure. They need to come on high as there is only one setting that they will come on, so if you set them to come on low, if that isn't enough there would be no way to trigger the high speed.
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