Adding A/c Condenser Fan to 03+ LX470

[fooldall1]

I haven't looked into it that far. I've only decided that when my OEM fails....I will probably replace it with a Derale 2 speed fan. Do the same thing for my 80 series when it goes. I'll have to fab up mounts for it...but how hard could that be?

High Output Single RAD 404 The requested product does not exist.

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derale.com

Interesting, I'd like to see it when or if you do- the plate on the two motor fan appears to be mounted on a plate that seems it could restrict the airflow around the fan. Just a thought, though- it could work great.

 

[Flipped Bezel]

Any idea what the part number for the electrical plug at the fan is?

The Toyota part number for the plug is 90980-11237 and the two pigtails needed are 82998-12480

 

[saudi]

I could have built a harness quite easily but with a big trip coming up time is getting harder to find. So I just bought one of these: Amazon product ASIN B014OS8E7Y
Its a simple relay harness, you cut off the crappy switch they send you and wire that end to the A/c pressure switch terminals (polarity does not matter). I mounted the relay harness like below, you can barely see the relay under all the main cables coming off the fusible link box behind the battery +ve terminal - its mounted to an existing wiring support bracket. There is a handy ground next to the main fuse box. The fuse box is ziptied to the existing main ground cable.

View attachment 1753827

View attachment 1753835


I routed the pressure switch wiring through the firewall grommet next to the battery and into the DS fender, then down to the switch. I cut off the plugs that are supposed to go to the light-bar and then used marine-grade butt connectors at both ends.

View attachment 1753836

The finished product, works almost exactly like OE. Assuming the relay is of reasonable quality, this should be good for several years.
View attachment 1753837

What size is the fan

 

[Niko1]

Happy to report this solved my poor a/c performance issue!!

 

[Niko1]

@whitenoise. Does this cool kit you put together work for a 1998 landcruiser. I would like it controlled by the pressure switch like yours!

 

[whitenoise]

It should. Sorry for the late reply. I’m not posting much here these days.

 

[thought]

Hope you get to see this question before I try this again but I tried to do it your install.. and I think I might have miswired it. The fire and melted wires were a pretty big hint haha.

I think I messed up by wiring the wrong wires to the AC pressure switch. When I cut off the switch, there was a black, white, and blue wire. I looked it up and I guessed that I was supposed to use the black (negative) and white (always hot) wires. I soldered them to the pigtails, connected everything together and started the engine.

Fan came on right away which surprised me but everything else seemed to be working fine. What surprised me even more was when the new harness started to smoke, melt, and then go on fire. After putting that out and inspecting what melted, the white/black wires seemed to be the ones with the issues.

Am I correct in assuming that the blue wire was the wire I was supposed to wire to the AC pressure switch? And that the white wire, since it was always hot and only supposed to provide power to the led light in the switch, drew too much current and melted? And now I'm worried that once the pressure switch closes, if I somehow have screwed something other than the white/black wires up, the fan will turn on and then the wires will start a fire while I'm driving.

As for the rest of the wiring, I had the light bar wires going to the fan, and the positive wire to the + battery post and the negative wire going to the same ground you use din your pics.

 

[theferg]

Hope you get to see this question before I try this again but I tried to do it your install.. and I think I might have miswired it. The fire and melted wires were a pretty big hint haha.

I think I messed up by wiring the wrong wires to the AC pressure switch. When I cut off the switch, there was a black, white, and blue wire. I looked it up and I guessed that I was supposed to use the black (negative) and white (always hot) wires. I soldered them to the pigtails, connected everything together and started the engine.

Fan came on right away which surprised me but everything else seemed to be working fine. What surprised me even more was when the new harness started to smoke, melt, and then go on fire. After putting that out and inspecting what melted, the white/black wires seemed to be the ones with the issues.

Am I correct in assuming that the blue wire was the wire I was supposed to wire to the AC pressure switch? And that the white wire, since it was always hot and only supposed to provide power to the led light in the switch, drew too much current and melted? And now I'm worried that once the pressure switch closes, if I somehow have screwed something other than the white/black wires up, the fan will turn on and then the wires will start a fire while I'm driving.

As for the rest of the wiring, I had the light bar wires going to the fan, and the positive wire to the + battery post and the negative wire going to the same ground you use din your pics.

Hey @thought - did you ever figure out where you went wrong on your wiring? I'm DIYing this on my '05 and '06 LX470s for hot Southern Utah and want to make sure I get the wiring straight. I'm doing basically what @whitenoise did on his. I've got the fans, the pre-built lighting wire-harnesses (I'm lazy), the OEM connector plugs, and the wire sections and I'm ready to go other than will need the small L-bracket for the 2nd bolt mount, but i'll get those figured out. Just want to make sure I get the wiring into the compressor correct.

(Note: I initially tried to purchase full kits from Phil--actually had two of them bought and paid for for a couple months--but Phil was unable to get fans from his supplier so he eventually had to cancel and refund the order. Oh well.)

 

[94SRUNNER]

Hey @thought - did you ever figure out where you went wrong on your wiring? I'm DIYing this on my '05 and '06 LX470s for hot Southern Utah and want to make sure I get the wiring straight. I'm doing basically what @whitenoise did on his. I've got the fans, the pre-built lighting wire-harnesses (I'm lazy), the OEM connector plugs, and the wire sections and I'm ready to go other than will need the small L-bracket for the 2nd bolt mount, but i'll get those figured out. Just want to make sure I get the wiring into the compressor correct.

(Note: I initially tried to purchase full kits from Phil--actually had two of them bought and paid for for a couple months--but Phil was unable to get fans from his supplier so he eventually had to cancel and refund the order. Oh well.)

View attachment 3018222

Where did you get the wiring harness?

 

[theferg]

Where did you get the wiring harness?

Just the one that @whitenoise posted on the first page

https://www.amazon.com/gp/product/B014OS8E7Y/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1

 

[94SRUNNER]

Just the one that @whitenoise posted on the first page

Amazon product ASIN B014OS8E7Y

Totally missed that. Thanks

 

[Red Beard]

Is it possible to have both auto and manual function? So like the switch can have an "Auto" position that lets the pressure switch do its thing. Or, you can switch it to just "On" and it runs. Like a 3 position switch? Maybe anything other than auto isn't needed but I was thinking for really hot times when you force it to stay on.

 

[Red Beard]

@whitenoise For wiring the pressure switch to the relay switch, the switch that shipped with my harness had 3 wires coming to the switch. Which of those 3 wires do I connect to the cruiser's pressure switch?

T.G. (Blue), COM (Black) and V/G (Blue) are the labels for the wires.

 

[Red Beard]

Ok, so I think I figured it out. I haven't tested it yet but I'm pretty sure we're just concerned with the blue and white. The switch has a light that always

• White seems to be fused 12v
• Blue is the wire going to the switch input on the relay.
• Black is ground

So we want White and Blue switched by the pressure sensor switch. I will test once I recharge my system.

 

[Red Beard]

Ok maybe I didn’t. Or something else is up. So I know the fan works. But with it hooked up to the pressure sensor, it’s not turning on. It appears the highest pressure I got on the high side was ~205psi but it wasn’t super hot out, right around 79*F.

I’ll keep an eye on it to see if it turns on when it’s hotter out? Or maybe the sensor plug wiring is off.

I’m assuming the fan should turn on when the AC compressor kicks on?

 

[Red Beard]

Ok confirmed in hotter temps that my wiring was correct. I was happy to find my condenser fan running today in 91F temps today in Philly. Stayed on for 10 seconds or so after I turned off the ignition as well.

 

[daohaus]

Ok confirmed in hotter temps that my wiring was correct. I was happy to find my condenser fan running today in 91F temps today in Philly. Stayed on for 10 seconds or so after I turned off the ignition as well.

You think you can provide a wiring diagram of how you went about it? I'm more of a visual person

 

[Red Beard]

You think you can provide a wiring diagram of how you went about it? I'm more of a visual person

Don’t have time to draw one at the moment but in case you’re looking to wire this tomorrow I’ll put it super basic:

Ignore and tape off the black wire.
Attach the blue and white wire to the small wire pins and attach those wires and plug them into the pressure switch connector. Like whitenoise said, it doesn’t matter which side you put the white and blue wires. Make sure the pins seat correctly. I also added some dielectric grease in there.

The pressure switch will connect those two wires (white and blue) to enable the fan. That should happen at 220+ psi on the high side which should happen on hot days.

Double check the polarity is right on the fan connector from the relay. I connected the fan to the battery to make sure I had positive and negative in the right spots. I actually originally had it wrong and the fan was going backwards.

 

[Biga27110]

Thanks everyone for the install its very informative. Where does the pressure switch go and where do we purchase that i dont see that anywhere in the process.

 

[daohaus]

Thanks everyone for the install its very informative. Where does the pressure switch go and where do we purchase that i dont see that anywhere in the process.

The pressure switch is on the car already if I'm not mistaken. It's just a matter of acquiring the electric fan and relay to get it powered up