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05-12-2022, 05:54 PM
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#1 |
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Junior Member
 Join Date: Jun 2020
Posts: 34
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Radiator fan will not come on - AC works, ECTS good, Fan motor works
Hi all,
Been having an issue with my radiator fan not coming on on my 1999 SL1. Since summer has arrived and the reality of stop and go traffic in 100F weather is coming close, I figured I should fix it. Here's the thing though. I'm pretty stumped on what it is. So here's what I've done so far, AC works and is at proper pressure, fan will not come on when AC is activated. I tested the fan motor via a direct 12v connection to battery. It comes on and works fine. ECTS was replaced about 30k miles ago with the good model. Did the test anyways of unplugging it, and also used a paper clip on the ECTS connector to check it. Fan did not come on either way. Swapped the fan fuse from a different Saturn with a known working fan, still did not come on. Pretty sure it's not getting power for whatever reason. Really not sure what to do next at this point. Anyone have any pointers? Thanks Last edited by afskwarek; 05-12-2022 at 05:59 PM. |
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05-12-2022, 06:37 PM
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#2 |
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Master Member
 
Join Date: Oct 2016
Location: Poplar Grove, IL
Posts: 3,713
1999 SL2
1998 SC2
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Re: Radiator fan will not come on - AC works, ECTS good, Fan motor works
Try swapping the fan relay.
...
Bryan Cotton '99 SL2, 5SP bought new Rebuilt at 204,067 September 2017 Engine, subframe, diff pin mod, brake lines, headliner, alternator, and so on! '98 SC2, 5SP bought 2018 |
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05-12-2022, 07:27 PM
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#3 |
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Junior Member
Join Date: Jun 2020
Posts: 34
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Re: Radiator fan will not come on - AC works, ECTS good, Fan motor works
Sorry, I was getting fuse/relay mixed up again. But yeah I did that with several different relays as well as the 30a fuse, still no dice.
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05-12-2022, 08:18 PM
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#4 |
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Super Member
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Re: Radiator fan will not come on - AC works, ECTS good, Fan motor works
Next thing to try is jumping pin 87 to pin 30 of the radiator fan relay connector in the fuse box.
Use a 14awg wire and clean off about 1in of the sheathe off each end, then just shove it in the pins (IPA makes a kit for $45ish, seems silly just for testing). If it turns on the fan (key off) then power is fine to the fan from the battery & fusebox so it has to be an issue with the activation circuit (pins 85 and 86). |
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05-17-2022, 06:33 PM
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#5 |
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Junior Member
Join Date: Jun 2020
Posts: 34
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Re: Radiator fan will not come on - AC works, ECTS good, Fan motor works
So I did try to jump pins #30 and #87. Fan still won't turn on. Had a tone circuit tracer lying around figure Id give it a try. Connected it to the fan connector. Got good tone on the fan connector wire up to where it goes into the harness bundle. Also got solid tone on the fan relay, so the wiring from the connector to relay must be good unless I'm doing something wrong which is totally possible. Quite perplexed at this point.
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05-17-2022, 07:15 PM
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#6 |
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Master Member
Join Date: Jul 2013
Posts: 7,015
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Re: Radiator fan will not come on - AC works, ECTS good, Fan motor works
Do you have 12V at either #30 or #87 of the relay socket?
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