fj40 carb cooling fan...do you run yours? (2 Viewers)

[mloudy]

Where is the control box or module for this sensor ??

Firewall, inside, passenger side. If you are a little guy and flexible so can get to it pretty easy.

 

[Pdwight]

Thanks , I am neither.....but persistent. I know mine has never ever worked from day one (when it was new). I removed the fan and cleaned lubed the motor checked the brushes and it still looks new....test ran it on the bench with a current limiting power supply and it works like a champ at 12.5 volts it draws 1.53 amps. After I get my engine back in I am going to have this working.

Thanks
Dwight

 

[fjwagon]

Just remember that the timer(module looking thing by firewall) has a history of cold solder joints on the connector that is attached to the circuit card assy. If it's hard to see, take outside w/good sunlight, or use a magnifying glass to make sure it's ok. If it's bad you will see little cracks in the joint. The timer gets two signals, 1. from the sensor located by the carb. area which is a thermistor, Change in temp changes the resistance state, open/close. The thermistor usually oxidizes because of it's location so remove it and clean it. If you are still not sure it's good test it on the bench using the ohm function on a multimeter and heat gun. Should see a change in resistence as the temperture rises. Basically a ground singal(from thermistor) gets fed back to the timer and 2. the ignition switch has to go from the "ON" postion to the "OFF" position to activate the timer and eventually turn off. If it's still hot cycling the ignition switch will cause it to come on. When both conditions are met, the timer will energize the relay causing the fan to come on. I have not swapped parts between the fan and heater motor but they seem to be identical on my May 79 so if you need motor parts that could be a possiblity.

 

[mukker4life]

Carb Cooling Fan

Looks like I'm not the only one around having Vapor Lock issues this summer. So I'll bump this thread and look for some input?
I have an 8/76 from california, W/ a carb cooling fan that is not hooked up. Everything looks complete and intact but no connection to the fan.

This is what I am looking at, green plug from Fan looks like it should just plug into the white plug on the fender but it dosent have the same connection.

Where should the wire to plug into the fan come from? under the dash? Does anyone have a pic of there opperational fan of the same vintage?

Thanks

 

[77mustard40]

Sensor Location

Just to be sure is this my sensor? My fan has never worked so I pulled it last summer with the intent of cleaning it up and testing it, then working backwards to find the problem. Just want to make sure this is the sensor (located behind carb)

 

[Fast Eddy]

Just to be sure is this my sensor? My fan has never worked so I pulled it last summer with the intent of cleaning it up and testing it, then working backwards to find the problem. Just want to make sure this is the sensor (located behind carb)

The sensor is attached under the exhaust manifold. To best see it look over the fender and under the brake master. There's a picture of one in this thread. Your's may look slightly different. On a '78 it connects to the harness at the same place as the brake pressure sensors, right by the carb fan itself.

I had a minor hot starting issue over the weekend myself (temps were 100 f). I've got the '76 fan as mukker4life has which I picked up at a swap meet. I guess I should dust it off and see where it fits. I'll take a look at the connectors when I get home in a couple hours. Edit: I didn't get to it.

 

[mukker4life]

That looks like the same sensor on my 76, mine is mounted much lower. On the carb heat shield behind the carb.

 

[hey you]

My 9/77 works great. Now I all need is a cooling fan for the driver.

 

[kurtnkegger]

77 California emissions style

These are pictures from my 77. I have the same fan as you. The green connector attaches to another green connector with a blue/red wire, and a white/black wire.

 

[kurtnkegger]

If the sensor above is for the fan...Mine is mounted to the air rail, and the connector appears to attach to the same color wires as the fan. all wire go in to the firewall...

HTH

 

[77mustard40]

Thanks Kurtnkegger those pics help a lot. Since I have a webber and headers my sensor appears to have been moved by the PO, but your pics will be great because I've been collecting parts to go back to a stock carb.

 

[Devilmans Hand]

Mine used to work...then suddenly stopped.
Maybe I should fix it, seeing that i sometimes have start up issues when its hot out.

 

[mukker4life]

Thanks Kurt, that helps me also. My white plug has the same wires going into it. I'll trace it back to the fuse and may just end up jumping the plugs as see if it works correctly when hot? I already made sure the fan works.

 

[Fast Eddy]

Mine used to work...then suddenly stopped.

It's just the fuse, wrapped in tape behind the heater duct on the passenger side. Easy fix.

 

[Fast Eddy]

This is what I am looking at, green plug from Fan looks like it should just plug into the white plug on the fender but it dosent have the same connection.

Where should the wire to plug into the fan come from? under the dash? Does anyone have a pic of there opperational fan of the same vintage?

That fan is the same as Kurtnkegger's '77. The fan I got at a swap meet is different, at least how it mounts. If there was a 2-piece mount, I don' t have the fender piece. My fan mount ends right by the motor with a flat vertical metal bracket with two holes for horizontal bolts. It's very clearly OEM. No pic now, sorry. The fan, shroud and motor are very similar if not identical.

The fan I have has the white plug that matches the white plug coming out of your and my harness with two pins at 90 degrees, as opposed to the green plug with two parallel pins.

 

[kurtnkegger]

I think the fan I have is exclusive to the California spec emissions model. It seems the non-Cali fans run from the middle of the fender well area.

 

[Fast Eddy]

I think the fan I have is exclusive to the California spec emissions model. It seems the non-Cali fans run from the middle of the fender well area.

Link to a picture of that? A '78 carb fan blows from the vent near the apron across, under the master; totally different.

Here's one from an fj60:

Mine is not like this. It's like yours, but with a different bracket. I'll go get my camera and upload the picture.

 

[Roboosfj40s]

This really informative. I had no idea the 40's had a carb cooling fan. My 78 is Non USA and no fan, no sensor, no vapor lock and it gets a little above 100 degrees at times here but mostly 85 up year round with very high humidity. Stock carb too. Then again no emissions stuff either. could be the difference idk.

 

[Curtice]

Link to a picture of that? A '78 carb fan blows from the vent near the apron across, under the master; totally different.

Here's one from an fj60:

Mine is not like this. It's like yours, but with a different bracket. I'll go get my camera and upload the picture.

I believe this is how mine is set up in my 1980 (currently does not work):

 

[nuclearlemon]

. Do most FJ drivers have a functioning carb cooling fan? I have a 78, but I'm not familar with the story behind the fan...it seems like a design flaw fix and I wonder if they later fixed it where a fan isn't needed.
.

the fan is on the emissioned engines, so not on non u.s. models. it was required because the emissions caused higher temps and that created the fuel issues.