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Old 09-10-2016, 12:11 PM   #1
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Default Radiator fan control question after DIYPNP2 installed

Hi All,

I have a fan issue I cannot seem to diagnose after alot of searching on the forums, so here goes...

I have a DIYPNP home built installed on a 1993 miata with a 1.8 engine swap, NA at the moment. My current issue is that the A/C fan comes on with the ALED output (set for CLT control), but I am expecting the Radiator fan (passenger side). When I turn the A/C on the A/C clutch, A/C fan and Radiator fan all come on.

Is this typical based on the 1990-1993 DIYPNP wiring instructions? I expected the ALED output to control the radiator fan, not the A/C fan, but i guess it really doesnt matter, just confused.

Thanks for any help.
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Old 09-10-2016, 01:19 PM   #2
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the a/c fan operates when the a/c relay is turned on, there's no separate way [or need] to control it. the main cooling fan also gets activated as well.

unless someone fooled with your fan wiring, i don't see how you could only activate the a/c fan on a 1.6L.
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Old 09-10-2016, 02:05 PM   #3
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Agreed, this seems really strange. Not sure how it is doing it, but the ALED is controlling the radiator fan. I am the original owner of the car, so I dont think I have done anything to the wiring, but it has been a number of years.

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Old 09-10-2016, 02:20 PM   #4
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wait, which fan turns on with ALED: the cooling fan or the a/c fan?
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Old 09-10-2016, 02:25 PM   #5
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ALED is turning on the A/C fan- I think my last post was mis-typed.
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