Horton Electric Fan Installation Notes

Subject:   Re: Horton Fan
Date:       Tue, 06 Jan 1998 13:07:58 -0800
From:      Bernard Rate <bernard.rate@tek.com>
To:          cummins

By popular request, here is how the Horton Electromagnetic Fan Clutch installation went.

I ordered the Mopar kit from the local dealer (I think I paid $700) then started looking for tools.

I ordered two open-end wrenches, 1&7/16 and 1&7/8.

I ordered a chain-wrench, by Vise-Grip.

Later, I bought another by Ridgid; neither are easy to use.

When the kit arrived, I read through the book carefully. It is well documented except for one thing, which is obvious but should be spelled out- you have to cut a notch in the fan shroud for the wires to exit. The kit is very complete- in fact I had a couple of nuts and bolts extra.....hmmm. The hub is very heavy and made in Japan. It looks like a well-engineered device.

First I removed the existing fan using the 1&7/16 together with the chain wrench. To do this I had to disconnect the top hose and the positive battery jumper cable. Of course I had disconnected the battery negatives beforehand. (Be careful with this jumper later; I was not and ended up replacing some ground wires as a result). To remove the fan completely I had to remove four bolts from the fan shroud, which involves removing the coolant reservoir and the windshield reservoir. Then I could lift out the fan and its shroud together. I did not have to remove the oil filler tube as suggested.

Next I placed the previously assembled Horton clutch and Horton fan unit inside the shroud and with help from my spouse lowered the whole thing into place, and hand tightened the Horton hub nut. The 1&7/8 wrench was too thick, so I spent about 2hrs grinding it down with a 1/2 hp bench grinder. That was probably the most time consuming part. It was a $25 Chinese wrench so I did not feel so bad.

The worst part was grinding down a  $25 wrench to fit the Horton nut.
Note to Mopar: why don't you include a cheap, thin 1&7/8 wrench?

Wiring it was straight forward with the harness supplied. I had to remove a plug from the engine block and screw in a temperature sensor. This involved loosening the alternator to make space. I also had to remove a sensor from the A/C plumbing, and add a T-piece plus another sensor. I also had to make a connection to the PDC for power, very easy. Finally I fished two wires under the dash to a switch (provided) near the drivers left knee, for manual override.

Was it worth it? Too soon to tell. I drove it for 75 miles afterwards, in 45 deg F, unloaded. The fan never kicked in, even on 6% grades up to 1600 ft.. The temp gauge fluctuation is practically gone. The noise level is lower I think. Too soon to say whether mpg has improved. It definitely warms up faster, which is nice.

When I have more miles on it, I will send out an update. Feel free to send questions if I left out something (quite possible since my 45-yr old brain has some bad bytes)

Bernard Rate

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