Aftermarket radiator fan question.

[G1NITSOOB]

I put in a aftermarket radiator fan and wired it up, but it doesn't seem to be working, I hooked it up to a battery before hand and it worked. The old fans worked, so why won't the new one work?I also hooked it up on the radiator fan side, not the air conditioning side according to my 1G dsm Technical manual.

I have a 90 Talon.

 

[rad]

There's a small fuse box right on the positive battery terminal, check to see if the middle pink 30A fuse is OK. From the fuse the current goes to a relay (on the passenger side, next to the strut) and from there to the radiator fan (passenger side) and straight to ground. That simple.
Double check the wiring, make sure correct wires go to your fan and thermo switch.
I'd take the relay out (labeled 'rad fan') and put in a wire-jump where its load terminals go (with ignition key on, look in your book for exact terminals or open up the relay).
And:
--If the fan doesn't spin something is up with your wiring going straight to the fan. Check the voltage on your jumper wire, should be battery. Check voltage by the fan plug, should be battery
--If the fan spins now it's either the relay or what controls it - a thermo switch inside the radiator, next to the bottom hose. Pull the plug off of the sensor, and jump it . The relay should click, and the fan spin (actually this will make another relay switch, a 'hi-lo' one on the driver side. Don't worry about it, it slows down ac fan when radiator fan is on)
If it does it is the sensor or something with wiring or even the plug itself...
If it doesn't try swapping it with a different one, still nothing - check for ignition key voltage on coil terminal and ground too (should not float)

I think this should nail it down, if not tell us what happened

Oh yeah, you'll be working with a slow blow fuse and 30A current, don't make a short
And keep your hands AWAY from the fan, it has mind on it's own

Good luck,
rad

I put in a aftermarket radiator fan and wired it up, but it doesn't seem to be working, I hooked it up to a battery before hand and it worked. The old fans worked, so why won't the new one work?I also hooked it up on the radiator fan side, not the air conditioning side according to my 1G dsm Technical manual.

I have a 90 Talon.

 

[G1NITSOOB]

Ok, when I turn on the A/C, the fan will run. But how does that work if I wired it to the radiator circuit according to my DSM manual? Does the A/C turn on both fans at all times?

I will try the stuff you mentioned and see if that gets it going, thanks.

 

[Nanan]

Ah are you hitting a hot enough temp to actually turn the fan on?

Im not sure with 1g but 2g will turn both fans on when the ac is running, this might not even apply to all 2g as the 95's had some very strange wiring next to the rest of the 2g's.

 

[G1NITSOOB]

well usually my temp gauge wouldn't get above half, this time it was almost to the high mark and the fan wasn't turning on.

 

[rad]

I just looked at some diagrams and yes, both circuits are connected by HI-LO relay, pin 4 in it's idle (low) state (past the resistor)... When AC is on 2 fans spin slow (using AC circuit), when radiator and AC are on - both switch to high speed (using their own circuits), and radiator fan works by itself...

So .. if both your fans spin when AC is on, and radiator fan doesn't spin on it's own the problem is between [battery - pink 30A fuse - RAD-relay - RAD fan - ground] or [ignition - relay coil - thermoswitch - ground]. 1 min check, i'm assuming the car is cold:
--check the pink fuse!
--pull out hi-lo relay
--pull out fan relay and check for 12V (You can use a small 12V test light for this, no manual needed, can't hurt anything. Attach 1 end to ground and probe with the other one, all 4 pins). With ignition key OFF - only 1 pin will be hot: the power line (if not- problem is between bat-pink fuse-relay).
With ignition key ON - another pin should turn hot - this will be ignition switch line, it runs through relay's coil, all the way down to termoswitch and ground. If it doesn't become hot check small fuses.
--if 12V is ok and since you're here check grounds - reattach test light wire to fused +12 battery, and probe previously 'dead' relay pins. 1 of them should light up. That will be fan's coil. If nothing - problem is between relay-fan.
--pull off connector off of thermoswitch and stick a jumper in. This will simulate hot coolant. Recheck ground pins, the other one should light up. If not - check the thermoswitch.
If everything checks out it's the relay, swap it with something less important to see if the fan starts.
I think i got it all, right?

 

[G1NITSOOB]

Thanks for the help, I haven't got around to it yet, but I will soon.