May 14, 201312 yr I was under the impression it would come on with the main fan, when the A/C was turned on. But this appears to not be the case. So what conditions enable the sub-fan?
May 15, 201312 yr Author You didn't say what kind of car. Turbo and non-turbo have different fan systems. Right... 98 Legacy GT.
May 15, 201312 yr Okay, sounds like it's not working right. Here's the diagnostic procedure: http://www.seccs.org/tech/1998%20Legacy/Service%20Manual/DIAGNOSTICS%20SECTION/ENGINE%20COOLING%20SYSTEM/MSA5TCD98L21310.pdf
May 15, 201312 yr Some of them also have a 'map' as to which fans are on and when, and it has a few variables. Example:
May 30, 201312 yr Author I... am an idiot. I could have sworn I checked the 20A fuse under the hood for the subfan, but apparently I did not. Looked at it today, and it was blown. Replaced, and the subfan comes on again.
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