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Old 07-12-2015, 03:10 PM   #1
operator john
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Default manual radiator fan switch

Trying to do Wolf man manual radiator fan switch. Found the relay & used my test light on all four prongs of relay & nothing happens ! Light comes on the test light but no click of the relay or fan does not go on ?? What am I doing wrong. Thanks for any help John

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Old 07-12-2015, 03:27 PM   #2
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2003 L-Series 3.0L Sedan
Default Re: manual radiator fan switch

Do you use a/c or not? If it's broken and not worth repairing, you can modify the a/c wiring into a manual fan switch.

It helps to update your profile to reflect what you're driving to eliminate playing twenty questions........

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Old 07-12-2015, 03:57 PM   #3
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Default Re: manual radiator fan switch

Sorry about that. 97sl2 auto 17500.00miles ac does not work. When sitting in traffic at night the fans come on at the normal temperature. I just wanted to have a manual switch so I can control the fans.

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Old 07-12-2015, 04:16 PM   #4
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Default Re: manual radiator fan switch

No apologies necessary. When you have the time, go into your profile (User CP) and add car info so it comes up under your name. All that's needed in posts are new descriptions of symptoms, mileage and any pertinent info so anyone reading these threads has some idea of car history.

If you have no desire to restore a/c function (a must before a modifying a/c wiring); 1)disconnect the a/c power connector, remove the a/c fuse and relay (better if all three are done) and 2)locate the a/c pressure sensor (near the radiator side tanks). When you locate the pressure switch, disconnect it and insert a small wire jumper across the female connector. You now have a simple fan cooling circuit manually controlled by the a/c button on the hvac panel. Turn on a/c to turn on the cooling fan. Turn off a/c to stop the fan or the ignition switch will turn it off. However, leaving the a/c ON will turn on the fan as soon as either ignition is turned ON or right after the engine is started.

Ensuring the compressor plug is disconnected, the a/c fuse and a/c relay) are pulled won't power up the compressor. The wire jumper inserted into the pressure switch connector sends a false signal to allow the pcm to turn on the compressor when its not supposed to. What this will do is allow the fan to turn on while the compressor plug is disconnected, fuse and relay are pulled - a manual fan switch. If the fuse or compressor plug is left in place, the compressor will power up and seize from lack of refrigerant and may break the serpentine belt. If allowed to, the compressor will make loud noises as it runs dry of lubricating oil, quickly destroying itself internally.

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Old 08-20-2015, 02:46 PM   #5
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2002 L-Series 3.0L Wagon
Default Re: manual radiator fan switch

The ECU does a far better job of controlling the fan than you will be able to. Let it do its job.

As for the relay, the ECU sinks the current. In other words it switches ground, not 12V. The 85 terminal of the relay socket should be hot at all times. The ECU grounds terminal 86, closing the contacts of the relay. But again, it is simpler and better to just leave it as is.

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Old 08-20-2015, 06:13 PM   #6
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Default Re: manual radiator fan switch

Wolfman says to use 20 AWG for the switch, i have a lot of 18 AWG
would that work.

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Old 08-20-2015, 07:49 PM   #7
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Default Re: manual radiator fan switch

18 AWG can carry more current than 20 AWG.

...
Gold 1999 SC2 ~385k Kms

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Old 08-20-2015, 07:50 PM   #8
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Default Re: manual radiator fan switch

Yes, 18 gauge has more wires than 20 and is useable.

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