So creeping in traffic on a hot day means it will not come on to provide airflow for comfort cooling until engine temps get high enough. I may got back to my jumper idea to run the cooling fan low whenever the Clutch is on. Which relay does the ecu turn on first? I may jumper the other so I get low speed with ac on, and then high for ECu on The ecu is able to turn on the cooling fan correctly, just not always at a good time for comfort cooling. Most AC systems, even old and modern have a high pressure switch to turn on a cooling fan.
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