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Old 01-22-2008, 12:53 PM   #1
projectpete19
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Default Possible to make an ON/OFF switch for cooling fan in an SL2?

Hello,

I have a 1995 SL2, I have a problem where my cooling fan does not turn on so if I am sitting at a red light for a long time the engine will heat up to the red mark, when i start driving the engine temp goes back to a normal temp.

I have determined it to be either a bad cooling fan relay or the part where the fuses and relay connect to under the hood. I have put three relaya in there and they all burn out, you can see brown marks on the top of them. Also, sometimes if i run the car and press down or move the relay to the left or right the fan will kick on.

My car has alot of miles and i dont want to spend alot of money on it, so i was wondering if it is possible for me to splice the wires that are going to the fan and insert an ON/OFF switch that I can put under the steering wheel so when I am sitting at a red light and I see the engine temp getting too hot all I have to do is switch it on and the fan will turn on cooling the engine, then i can turn it off when it isnt needed?

If so do you know which wires i should splice?
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Old 01-22-2008, 07:19 PM   #2
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Default Re: Possible to make an ON/OFF switch for cooling fan in an SL2?

Try a search in the How-To library here, I think you will find what you need there.
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Old 01-22-2008, 07:29 PM   #3
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Default Re: Possible to make an ON/OFF switch for cooling fan in an SL2?

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Try a search in the How-To library here, I think you will find what you need there.
Yes, several of them.


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Old 01-22-2008, 07:58 PM   #4
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Default Re: Possible to make an ON/OFF switch for cooling fan in an SL2?

If he's burning relays...will the 'manual rad fan switch' mod even help him?
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Old 01-22-2008, 08:12 PM   #5
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Default Re: Possible to make an ON/OFF switch for cooling fan in an SL2?

Sound more like the electric motor or the wiring has a problem. I would think the fuse would blow before the relay would get fried, however. That would be its job!
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Old 01-22-2008, 08:38 PM   #6
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Default Re: Possible to make an ON/OFF switch for cooling fan in an SL2?

er...If you set at a red light long enough for the fan to come on.....there are other problems.........I can be setting for 10-15 minutes before my temp gauge goes up and the fan kicks on........and I live in GA!
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Old 01-22-2008, 08:42 PM   #7
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Default Re: Possible to make an ON/OFF switch for cooling fan in an SL2?

I would install a new ECTS and Wire connector. Check the How to Library there is a sticky there. ECTS=Engine Coolant Temperature Sensor.

Your ECTS and wire connector are probably shot...so the PCM computer is not getting the signal to turn the fan on when the engine hits 221 degrees.

Get both parts at the saturn dealer-$30.
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Old 01-22-2008, 10:38 PM   #8
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Default Re: Possible to make an ON/OFF switch for cooling fan in an SL2?

Quote:
Originally Posted by redkees@msn.com View Post
I would install a new ECTS and Wire connector. Check the How to Library there is a sticky there. ECTS=Engine Coolant Temperature Sensor.

Your ECTS and wire connector are probably shot...so the PCM computer is not getting the signal to turn the fan on when the engine hits 221 degrees.

Get both parts at the saturn dealer-$30.
Um, no. If the relay is burning up, it's because the fan IS turning on, not because it ISN'T. Thus, the ECTS is working. If it's the original ECTS, it needs to be replaced for its own sake, but, by definition, it's NOT the cause of this problem.

Indeed, a dash switch would simply mock the ECTS, close the relay contacts and burn up another relay. What's burning up the relay is what has to be found. Pete, this is unlikely, but can't be ignored -- make sure the maxi-fuse in position 7 of the underhood fuse box is a 30A. If it is, as suggested above, check the motor itself and the wiring to it.
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Old 01-23-2008, 12:31 AM   #9
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Default Re: Possible to make an ON/OFF switch for cooling fan in an SL2?

If the ECTS is bad, it could cause the fan realy to fail. This happened in my 1993 SW2. The majority of the time when the ECTS fails, the PCM thinks the engine is cold. But there are occasions when the ECTS fails and reports that the engine is hot. In this case the fan would constantly be on.

But I'd suspect the fan to fry before the relay does. But anything can happen. Its a Saturn.
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Old 01-23-2008, 07:18 AM   #10
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Default Re: Possible to make an ON/OFF switch for cooling fan in an SL2?

I'm thinking as others are that the motor is drawing too much current. Probably the beginning of bearing failure.
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Old 01-23-2008, 08:28 AM   #11
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Default Re: Possible to make an ON/OFF switch for cooling fan in an SL2?

If you bypassed the standard circuit, wouldn't that throw a quad-driver error?

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Old 01-23-2008, 09:33 AM   #12
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Default Re: Possible to make an ON/OFF switch for cooling fan in an SL2?

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Originally Posted by bobc455 View Post
If you bypassed the standard circuit, wouldn't that throw a quad-driver error?

-BC
That depends on how you do it. If you do it the way it says to in the How-To Library, I believe it will but, it'll go away when you turn off the switch. Low Saturn posted a way to do it without setting the SES light some time ago as well.
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Old 01-23-2008, 12:43 PM   #13
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Default Re: Possible to make an ON/OFF switch for cooling fan in an SL2?

Quote:
Fm > Bob C
If you bypassed the standard circuit, wouldn't that throw a quad-driver error?
Yes, however, the operative phrase would be: If you bypassed the standard circuit....
Quote:
Fm > Barn Owl
That depends on how you do it. If you do it the way it says to in the How-To Library, I believe it will but, it'll go away when you turn off the switch.
And as an additional input on this issue, if one follows Wolfman's instructions, one would not be 'bypassing' the standard circuit, but actually adding another means through which the fan can be turned on. In this case, it would be a 'manual' means for activation. There is no bypassing.

In closing, I've had no issues with any quad-driver error codes......ever.
And I've had my system for, it may be going on to five years.....would not be without it.
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Old 01-23-2008, 12:47 PM   #14
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Default Re: Possible to make an ON/OFF switch for cooling fan in an SL2?

Quote:
Originally Posted by Low Saturn View Post
If the ECTS is bad, it could cause the fan realy to fail. This happened in my 1993 SW2. The majority of the time when the ECTS fails, the PCM thinks the engine is cold. But there are occasions when the ECTS fails and reports that the engine is hot. In this case the fan would constantly be on.
That would cause the relay to be closed all the time, but that shouldn't cause the relay to fail. It's a standard 30A capacity automotive relay. It should be rated to be closed for long periods of time, just like with the fuel pump, fog lights, A/C, etc. If the relay couldn't hold up to being constantly closed, even if it's due a "high-failed" ECTS, it's a bad relay (or the motor is drawing too much, or wiring, or what-not). The bad ECTS, on its own 5-volt circuit, is just a "messenger" of some problem in the fan circuit itself. Yuh, agreed, ECTS should be replaced, and it might make the _symptom_ go away, but it won't make the _problem_ go away.
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Old 01-23-2008, 02:09 PM   #15
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Default Re: Possible to make an ON/OFF switch for cooling fan in an SL2?

It seems he has a problem with the heavy current loading, possibly from the fan motor, that caused that many burned out relays. I would solve that problem first before installing a manual switch or it could cause a bigger problem on the electric system.

If I see the temperature going too high, I just turn on the A/C for a few seconds and the fan will be "forced" on for awhile. I've never had a blown relay though.

Last edited by siliconvalley; 01-23-2008 at 02:14 PM.
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Old 01-23-2008, 03:13 PM   #16
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Default Re: Possible to make an ON/OFF switch for cooling fan in an SL2?

My guess would be a bad fan motor,which sometimes tries to run.
when it doesn't run ,just burns up relays (toasty)
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Old 01-24-2008, 10:13 AM   #17
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Default Re: Possible to make an ON/OFF switch for cooling fan in an SL2?

thanks for all the posts, i did change the ECTS even though the one i pulled from the engine was the newer design (copper not plastic).

i think i tried turning on the A/C before but it didnt help but I am going to try it again.

so is there a possibility of ruining the electrical system by putting a manual fan switch on the car?
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Old 01-24-2008, 10:24 AM   #18
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Default Re: Possible to make an ON/OFF switch for cooling fan in an SL2?

Quote:
Originally Posted by projectpete19 View Post
thanks for all the posts, i did change the ECTS even though the one i pulled from the engine was the newer design (copper not plastic).

i think i tried turning on the A/C before but it didnt help but I am going to try it again.

so is there a possibility of ruining the electrical system by putting a manual fan switch on the car?
I would figure out what is up with your cooling fan/motor before installing any additional electrics....
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Old 01-24-2008, 01:24 PM   #19
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Default Re: Possible to make an ON/OFF switch for cooling fan in an SL2?

i have never changed a fan motor, so which option would guys say is easier, should i buy a new fan motor and put it on or go to a junkers and get a whole fan assembly?
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Old 01-24-2008, 01:27 PM   #20
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Default Re: Possible to make an ON/OFF switch for cooling fan in an SL2?

It would be dang easy to get a fan at the junker's.

If you live in, say, arizona, the same conditions that wore your motor out will have put lots of wear on the junkyard ones.

You will find the universal motor you can get at an auto parts store fits a zillion front wheel drive cars, but IDK how hard it is... though don't see many people griping.
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