E-fan relay ?

[mooseknuckles]

I get a clicking noise form the second elec. fan relay when it want s to come on. I've tried switching relays and it still does it.....the first fan comes on when its supposed to and works perfectly, but the second fan relay just clicks....

[BR3W CITY]

fan motor seized up and drawing too much current, popping the relay?

[Crash_OK]

Is this a new install or did the second fan work in the past?

[mooseknuckles]

this is a brand new rad and e-fans.....the second fan works, but it never ever has come on when the pcm calls for it to come on. just the clicking in the relay.....I just put it off to being something wrong in the tune...?

[Crash_OK]

Originally Posted by mooseknuckles

this is a brand new rad and e-fans.....the second fan works, but it never ever has come on when the pcm calls for it to come on. just the clicking in the relay.....I just put it off to being something wrong in the tune...?

How are the relays wired.. Could it be a problem with the wiring? The factory wiring normally (the ones I know of) have 3 relays and run both fans at half speed or both at full speed. I am not sure what you have for your setup.

[mooseknuckles]

it's a PSI harness, and I tried switching the wiring and it still didn't matter, whatever fan was #2 the relay still clicked....

[solidaxel]

Does the second fan work when you put 12VDC to the hot side of the fan?

[softballnrd27]

I have the exact same issue. It is only on the 2nd fan relay. I can take the signal wire and swap them on the relays and the fan works just fine. I just hooked up a switch to control the 2nd fan until I can find out why it does that.
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[mooseknuckles]

both relays are wired the same, both fans work when hooked to 12v direct...so now I just wired both fans from the #1 signal wire, so when it comes on, both fans work...

[Hart_Rod]

Disconnect the computer signal to the #2 fan and trigger (ground) it manually. If that works then there is a problem with the computer or the tune. If it doesn't work, something is wrong with the way the #2 relay is wired.
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[mrhurt73]

ok i had the very same problem, i had the a/c pressure set to zero in the tune. i dont have the a/c run to the PCM, but its still looks for it.

i set the a/c pressure way up and it stop doing it and fan 2 operates properly now.

i had to figure it out by going on HP scanner and manually turning on fan 2 and it work fine, so i knew it was something in the tune.

hope this helps.

[mrhurt73]

see thread below where is posted mine.

http://67-72chevytrucks.com/vboard/s...d.php?t=574834

[mooseknuckles]

Originally Posted by Hart_Rod

Disconnect the computer signal to the #2 fan and trigger (ground) it manually. If that works then there is a problem with the computer or the tune. If it doesn't work, something is wrong with the way the #2 relay is wired.
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thanks I'll give that a try.....

[mooseknuckles]

Originally Posted by Hart_Rod

Disconnect the computer signal to the #2 fan and trigger (ground) it manually. If that works then there is a problem with the computer or the tune. If it doesn't work, something is wrong with the way the #2 relay is wired.
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tried that out today....#2 fan comes on when ya ground the relay, so now what?....lol

[mrhurt73]

did you check the A/C settings in the PCM?

thats what was wrong with mine.

[mooseknuckles]

Originally Posted by mrhurt73

did you check the A/C settings in the PCM?

thats what was wrong with mine.

umm...yeah. I got no way of doin that...

[mrhurt73]

remind me how did you get your anti theft turned off in the beginning?

you may have to get a tuner to look at it for you.

everything you described, sounds just like the problem i had.

i could be wrong, but you have already tried all the simple stuff.

[mooseknuckles]

Originally Posted by mrhurt73

remind me how did you get your anti theft turned off in the beginning?

you may have to get a tuner to look at it for you.

everything you described, sounds just like the problem i had.

i could be wrong, but you have already tried all the simple stuff.

I bought the pcm from PSI already to go ...or so I thought.

[mrhurt73]

i would call and confirm yours was set up to have 2 electric fans run off the PCM, its not the default choice, so someone would have had to set it.

worst case, is taking the PCM out and mailing back to be changed. i know not entertaining idea, but better than listening to a relay click in a hot truck

[mooseknuckles]

Originally Posted by mrhurt73

i would call and confirm yours was set up to have 2 electric fans run off the PCM, its not the default choice, so someone would have had to set it.

worst case, is taking the PCM out and mailing back to be changed. i know not entertaining idea, but better than listening to a relay click in a hot truck

yeah....it's supposed to be set up for two fans, one at 182* the sec at 192*, but there were a few other things that were supposed to be done as well....in the meantime the one relay is running both fans....