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Old 09-25-2016, 01:48 AM   #1
cpy911
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1996 SC2
Default Radiator cooling fan has me stumped...

I have scoured over many posts related to this issue and still stumped.
For this Saturn, the A/C system does not work. Most likely loss of freon.
However, the cooling function of the radiator fan to help keep engine cool when stopped does not work either.

What I tried without the engine running with key ON postion:
1. Jumpered pins 37/80 on the cooling fan relay to force HOT signal. Nothing happens except click noise over by the A/C compressor. Checked the fan connector for 12V and nothing.
2. Wired the fan motor terminals directly to the battery and the fan works!
3. Tried jumpering the A/C low pressure sensor via jumper and turned on A/C switch (not with car running, just ON position--does engine need to be running???) and no fan turn on. (I disabled to compressor by disconnecting the compressor connector before doing this.).

What can I try next?

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Old 09-25-2016, 10:25 AM   #2
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Default Re: Radiator cooling fan has me stumped...

What year and engine is this?

Was that "pins 37/80" a typo? Most automotive relays have pin numbers like 30, 85, 86, 87, and 87A. Feeding us incorrect info will severely cripple our efforts to help you.

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Old 09-25-2016, 01:21 PM   #3
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Default Re: Radiator cooling fan has me stumped...

^ I agree and if I'm not mistaken, the terminals jumpered were 30 and 87 - to send 12v to power the fan immediately.

1-Did you check for blown fuses?

2-Are you sure you jumpered relay terminal sockets 30 and 87? It's easy to jumper the wrong terminals.

3-Was the engine coolant sensor ever replaced?

Please update your profile to reflect what you're driving. Year, model?

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Old 09-25-2016, 03:20 PM   #4
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Default Re: Radiator cooling fan has me stumped...

Sorry, it was a typo. It jumped 30 and 87 for sure and I could hear a click at the A/C compressor but no fan. Fan works when hooked directly to battery.

Check all the fuses, but will do another pass, just for sanity check.

Engine coolant sensor on its way from Amazon, but this should not affect the pin 30 and 87 jumpered config?!?

'96 Saturn SC coupe. DOHC. A/T
Quote:
Originally Posted by fdryer View Post
^ I agree and if I'm not mistaken, the terminals jumpered were 30 and 87 - to send 12v to power the fan immediately.

1-Did you check for blown fuses?

2-Are you sure you jumpered relay terminal sockets 30 and 87? It's easy to jumper the wrong terminals.

3-Was the engine coolant sensor ever replaced?

Please update your profile to reflect what you're driving. Year, model?

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Old 09-25-2016, 07:55 PM   #5
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Default Re: Radiator cooling fan has me stumped...

Examine the drawing below. Probe terminals 30 and 87 - only one terminal will have 12v from a fused supply, the other terminal goes to one of the cooling fan connections. Be sure 12v is on one of the relay terminals to ensure 12 volts is sitting on one side of the relay contacts. Perform a continuity test on the other terminal going to the cooling fan connection. Somewhere is a broken connection. Also check fan ground connections.
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File Type: jpg 87A relay pin outs.jpg (30.4 KB, 2 views)

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Old 09-25-2016, 08:56 PM   #6
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Default Re: Radiator cooling fan has me stumped...

OP, which relay are you jumpering? Since the A/C clutch clicks when you jumper the relay, it seems like you are at the A/C relay, not the fan relay.

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Old 09-25-2016, 08:57 PM   #7
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Default Re: Radiator cooling fan has me stumped...

Jumpering the fan relay connector shouldn't activate the A/C compressor. Are you sure it was the fan relay that you bypassed?

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Old 09-26-2016, 01:56 PM   #8
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Default Re: Radiator cooling fan has me stumped...

You da man!
I was testing the wrong relay bank. I tested the fan relay by jumping it and the fan fires right up!

I am not sure why the previous owner is reporting cooling problems when sitting in the hamburger drive through. My guess is the temp sensor ECTS is shot. I have a new one on the way.

I am also thinking of rigging up a manual switch so I don't over heat in traffic in case I am unable to test anything.

Thanks!

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Originally Posted by madpogue View Post
Jumpering the fan relay connector shouldn't activate the A/C compressor. Are you sure it was the fan relay that you bypassed?

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Old 09-27-2016, 08:28 PM   #9
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Default Re: Radiator cooling fan has me stumped...

Options, in increasing order of benefit:
* Shut off the engine while stopped at the drive thru
* Park and walk in rather than using the drive thru
* Stop eating fast food

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