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Old 09-22-2020, 05:30 PM   #1
ted91
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Default 2001 L200 cooling fan not working

Hello all,

I have 2001 Saturn L200. It started having cooling issue and I realized that cooling fan not working. I checked the fuses and the seem to be fine. I also tested fan motor by connecting it with battery directly.

That leaves me with Fan control module(FCM). Is there a way to test the FCM?

Is there any thing else that that I need to check or anything else that I can do that will help me to solve the cooling fan problem?

Thank you
Ted
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Old 09-22-2020, 06:03 PM   #2
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Default Re: 2001 L200 cooling fan not working

Is this a dual cooling fan configuration or single? Two or three wire connector?
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Old 09-22-2020, 08:20 PM   #3
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Default Re: 2001 L200 cooling fan not working

Thank you for responding. It’s a single fan with 3 pin connector.
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Old 09-22-2020, 10:45 PM   #4
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Default Re: 2001 L200 cooling fan not working

I ask whether yours is a single or dual fan configuration because another thread (http://www.saturnfans.com/forums/sho...d.php?t=267363) describes a dual fan setup (same '01 L200) where one is in front of the condenser coil as a pusher and the other behind the radiator as a puller. Three wire fans in this configuration are operated by the fan control module for low/med/high speed. One wire is ground, second with a resistor for medium speed and third wire for high speed. Low speed wires both fans in series. Ac use requires both fans running in low speed immediately, ramping to medium and high speed up as coolant and/or ac pressures rise. With ac off, coolant temps, coolant rising above approximately 220F triggers low speed cooling, ramping up fan speeds as coolant temps rise.

If your L200 only has one fan, there may be two speeds. Above 40F, ac use will automatically turn on low speed fan cooling since the condenser coil and radiator are hot requiring fan cooling to prevent coolant from overheating from hot air coming off the condenser coil flowing into the radiator. If ac works, turn it on and check for low speed fan operation. High speed fan operation occurs only when ac pressures are very high (on hot and humid days in local stop and go traffic) and/or engine temperatures are near or at redline. If ac works, interior cools, and the fan doesn't run, it's most likely partial fan failure. Replace it. If ac doesn't work, mether the ac compressor nor the cooling fan will turn on.

I've replaced one of two cooling fans on my L300. Low and medium speed of the pusher fan failed. The puller fan developed a problem this summer - it would run intermittently on low speed and affect ac cooling. I found one of its three pins burning the plastic connector. Several disconnect/reconnect cycles allowed it to run then stop. Bending the male pin in the partially melted connector allowed better mechanical connection. No more intermittent ac cooling.
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Old 09-23-2020, 01:04 AM   #5
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Default Re: 2001 L200 cooling fan not working

Quote:
Originally Posted by ted91 View Post
Thank you for responding. Itís a single fan with 3 pin connector.
Are you sure that this set up is a single cooling fan only? Any time I've been to a wrecking yard to look for items for my car - and I've done this several times - I have yet to see any L-Series car with only one cooling fan. Look more closely at the front side of radiator facing the bumper and toward the passenger side you should see the "pusher" (condenser) cooling fan even when looking through the grill space. Otherwise, lift the front end some and inspect the area from underneath the car. I suspect that you're only looking at the fan on the engine side of the radiator which is considered the radiator cooling fan, aka the "puller" fan.
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Old 09-23-2020, 08:51 AM   #6
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Default Re: 2001 L200 cooling fan not working

As far as I can find out fdryer and pierrot are correct there are 2 fans.
Here is a circuit diagram for a 2003 L200, I expect it's the same.
First thing, check the 2 fuses, Then check the ground at the splice pack SP103. It provides the ground for the fan control module and the fans so, if bad, would prevent it all from working. If you have an ohmmeter, you can measure the resistance from pin A on C1 of the FCM to a good ground. It should show near 0 ohms. If it shows an open or resistive circuit find the ground splice pack and fix it. Alternatively, you could run a jumper from pin A on C1 of the FCM to a good ground. If the fans can operate fix the ground splice pack.
There are resistors associated with both fans. They could be open but that should only affect the slower speed of each fan.
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Old 09-24-2020, 06:16 PM   #7
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Default Re: 2001 L200 cooling fan not working

I had a ground issue affecting both fans. I only noticed because the horn quit working. There is a ground splice below the fan controller where all things front body ground. Brilliant GM put sensitive electrical grounds near the battery where corrosion lives. Remove the ground splice, open the black plastic cover and clean the grounds. That is what fixed my fans and horn.
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Old 09-29-2020, 08:46 PM   #8
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Default Re: 2001 L200 cooling fan not working

Quote:
Originally Posted by ted91 View Post
Thank you for responding. It’s a single fan with 3 pin connector.
This is problematic, I also had my cooling fan go out but testing a 3 pin isn't possible as you don't see the 3 speeds it uses. You best bet is a used working fan and hookup that to verify all 3 speeds work. That's how I found out it wasn't the fan cooling module but the cooling fan itself failing. I got a used one and replaced it and now it works at all 3 speeds. So unless you can make the fan turn at all 3 speeds battery hookup will not tell you this.

Last edited by Russet; 09-29-2020 at 08:49 PM. Reason: revise
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Old 09-30-2020, 10:22 PM   #9
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Default Re: 2001 L200 cooling fan not working

Each fan is a two speed fan, they run the fans in series to get the third low speed.
Just like they run the headlights in series to cut the voltage for the daytime running lights. Please refer to the factory service manual for detailed troubleshooting instructions.
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