Or relay control from PCM not working, relay itself bad, power to the relay for the fan power (fusible link/fuse) not present, or temp sensor for PCM, maybe. If engine fast idles when cold and idles down after warming up, this sensor may not be the problem.
Select either A/C or DEF to see if both fan(s) come on.
dude, you seriously only need to post your problems once.
they will be answered, asking the same question multiple times doesn't get you more answers, just makes us miss information or, in my case, makes us irritated
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