carbuff

Does the electric fan on a 2000 4.0 suck the air through like the mechanical fan or does it blow the air out through the grille? Mines been running a bit hot and I just noticed that its blowing out, opposite of what the other fan does. Is this right?

sycoglitch

Mines sucks air in and I dont have overheat issue

SteveMongr

The e-fan should draw air into the engine bay, just like mechanical fan. Inspect the harness plug that it is plugged in properly. The factory plugs usually can only connect the proper way, unless they are forced.

toasterknight

It should pull in so its not fighting the air coming in if your driving at speed and it comes on.

XJwonders

Both fans suck air in the engine compartment.

carbuff

This is what I thought too. It was bizarre. Im standing in front of the jeep and I feel all this heat coming off the grille. The pass side of the grille I can feel it drawing the air past my hand but on the drivers side Its blowing hot air out at me while the e-fan is on. Is there any way that the computer is reversing the fan rotation? I replaced this fan about a year ago and Im pretty certain that it was operating properly at the time.

SteveMongr

The computer will not reverse the e-fan. My guess is, it is installed backwards or is the wrong unit.
Look at which direction it turns and see if that matches the correct rotation of fan blades. This will determine if it is running in reverse or unit is backwards.
Also check harness plug for proper orientation.

Bugout4x4

Steve is right on with this. A lot of electric fans are multi application and the connector terminal polarity may have been installed into the harness plug housing backwards from yours from the maker and be meant for a different application. These can be carefully removed and switched around with a small pick.

carbuff

So, Ive confirmed that the fan is running backwards and blowing air into the radiator instead of pulling it through. The plug can only go on one way. Ive removed wires from connectors before but mostly in older gm vehicles. I have no clue how to disassemble this one. Theres a red plastic part inside the black outer connector that I guess I need to remove so I can get the induvidual metal connectors out of it. There are 3 holes in the red plastic plug. 2 of them are for the metal connectors but the 3rd is empty. Maybe its a key of some sort? Any ideas how to get it apart without breaking the connector open? I could always cut and reverse the wires as a last resort.

CCKen

Confirm the wire connections at the connector before tearing it apart.


Here's a pin out of the Rad Fan connector (body harness end). The Light Blue wire is power from the Rad Fan Relay.


Bubba may have spliced in a new connector and got his wires crossed.


Using a voltmeter or test light, test for battery voltage at pin 1 of the connector.

Bugout4x4

Ken is wise with this suggestion...double check your pin out before taking it apart. If it turns out they do need to be switched look down into the holes where the terminal connectors are in the plug housing. You will see each has a little spring "Catch" sticking from the outside of the terminals.


Please disregard the instructions I gave here. Wrong plug type.

Bugout4x4

This makes me wonder how many more might be out there with the fan running backwards?

cliffy

I just installed a new radiator today, I don't see how the fan can be installed backwards unless it was an upgrade or replacement.

Bugout4x4

Please disregard the previous instructions I gave you about how these plugs come apart. I was thinking of a different plug type than what you have, I was thinking of the ones on my Dodge Ram.


This is a male plug on the wires coming from the the fan right?

carbuff

It makes me wonder the same thing. I checked the pinout and it is correct coming from the harness. However, on the fan side of the plug there is a heavy gauge blue wire and a lighter black one. The plug has the black wire getting the power and the heavy blue one as ground. Backwards. I ended up cutting the wires on the fan side and switching, soldering, taping it up. It spins correctly now, sucking much air. This was a brand new replacement I bought off amazon. I wonder how many others are having heat soak problems due to this same issue. Its worth a look I'd say. Since I dont think I'll be seeing any more 75+ degree days here I will have to wait for spring to be sure.