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Old 12-29-2009, 09:18 PM   #1
memphismatt
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Electric Cooling Fan How-to

Hey folks, this is my electric cooling fan mod to my 92. I started with a mopar replacement fan (part # CBG4F250). I ordered it from moparone.com it was about $50 shipping and all. I got the relay kit off ebay, a guy called abad71camero, superfast shipping, for $30 +/-. I figure $80 and 1 afternoon is a heck of a deal for an electric fan conversion.

So, I started by taking the upper shroud off, the clutch fan, then the lower shroud. I did not drain or remove the radiator.





I bolted the upper and lower back together and put the fan on top to get an idea how i could make it work.

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Old 12-29-2009, 09:26 PM   #2
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Re: Electric Cooling Fan How-to

Next I put the fan inside the shroud and put it back in the truck to see how much clearance i would need in front of the water pump. I pushed it forward as far as it would go without coming out of the round part. I marked all three tabs, and used a dremel tool to cut three slots in the shroud.





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Old 12-29-2009, 09:37 PM   #3
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Re: Electric Cooling Fan How-to

After that I cut some strips of 16 or 18 guage sheetmetal. bolted it to the holes in the fan and then ran some tech screws through the shroud and into the strips.









This is the finished product.

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Old 12-29-2009, 09:50 PM   #4
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Re: Electric Cooling Fan How-to

Then I reinstalled the fan and shroud as a unit. It was pretty difficult with the heater hose and upper radiator hose in the way.

Here's the relay kit I used



I decided to mount the relay on the fire wall next to the fuel pump relay. I mounted the circuit breaker to the right of it. I picked up the hot for the fan and the relay from the terminal strip on the left.



I ran a #10 wire from the relay to the cooling fan for the hot and grounded the other side of the fan to the core support.
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Old 12-29-2009, 10:08 PM   #5
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Re: Electric Cooling Fan How-to

The last thing to do is put in a temperature switch to turn the fan on and off. there is a black wire from the relay that goes to the temp switch (it looks like a temp sensor, but it actually a switch that activates at specific temperatures).
I was going to put it down on the passenger side head where the sensor for the guage goes on the driver side. But i was unable to get the plug out. So i got a thermostat housing off a 70s model 350. It had a threaded hole just the right size, well kinda. The hole is 1/2" pipe thread and the switch is 3/8" pipe thread, so I had to use the supplied reducer.



Well the housing worked great for the temp switch but caused lots of problems with the upper radiator hose. I had to cut it in 2 places, rotate 1 end, cut a piece out of another hose and slice it together with some 1 1/4" tubing. here's the pic.

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Old 12-29-2009, 10:13 PM   #6
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Re: Electric Cooling Fan How-to

Well that's about it. It has worked great so far and the fan keeps the engine plenty cool. Even idling with the air on, the fan cycles on and off in Mississippi summer temperatures. I'll be glad to answer any questions or corrections if I have been vague.

Thanks for reading.
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Old 12-29-2009, 10:42 PM   #7
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Re: Electric Cooling Fan How-to

Thanks a lot for the post. This should be of benefit to anyone who has questions about doing an electric fan to replace the stock belt-driven fan. Plus, it is beneficial to the gas mileage and becomes one of those things that make you scratch your head, if you didn't know.
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Old 12-29-2009, 10:47 PM   #8
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Re: Electric Cooling Fan How-to

Nice write up Matt !


I do have a question, Can you measure the inside diameter of your shroud so I can see how well this fan may fit in my 97 ?





Thanks
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Old 12-30-2009, 12:43 PM   #9
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Re: Electric Cooling Fan How-to

Nice job. Thanks for the info.
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Old 12-30-2009, 02:18 PM   #10
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Re: Electric Cooling Fan How-to

Yeah, thanks Matt. I like yours a lot more than spending $500 on one from Summit.

Questions: How hot does it get with the 185/170 relay? Does it still have the stock thermostat?

The reason I ask is that my truck had trouble passing emissions with 180 tstat, but did fine when I replaced it with stock (either 192.5 or 195, can't remember). So if I went with an electric fan I'd have to make sure that I didn't "overcool." Thanks again.
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Old 01-02-2010, 07:06 PM   #11
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Re: Electric Cooling Fan How-to

Thanks for the compliments.

restorob: the inside diameter is 21" and is the same on my '96 'burb. its getting the electric fan too, after a new engine.

jb1016: the t-stat i had in the truck was the 160 degree unit. After the weather cooled down, It caused me to lose some gas milage and made to truck run bad below 1500 rpm. I had to change the t-stat back to the 195 and replace the temp switch with a 200 on, 185 off. it is the closest one i can find and i'm not sure if its going to work like i want it to. i'll let you know in a coupla weeks.
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Old 01-02-2010, 07:38 PM   #12
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Re: Electric Cooling Fan How-to

Great write up.

Thanks!
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Old 01-04-2010, 06:39 PM   #13
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Re: Electric Cooling Fan How-to

This sure is a great write up, I sure wish I had seen it when I put the dual fan setup on my '92 years ago. It sure would have saved a lot of money.

Again great write-up.

Danny
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Old 01-05-2010, 12:53 PM   #14
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Re: Electric Cooling Fan How-to

ive had good luck with the 2speed electric fan off of the 3.8 ford taurus and lincon mark viii. you can find them for 20bux and flow crazy 4500 cfm on high.

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Old 01-23-2010, 08:28 PM   #15
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Re: Electric Cooling Fan How-to

UPDATE 1/23/10

After a few weeks and some 75 mile trips, the electric fan is working great. I've noticed about 1 mpg increase. I was concerned about the temp switch not coming on until 200 but it seems to be ok. I want to make one change to this setup. I need to move the relay power to a switched hot to keep the fan from running after the truck is off. other than that i'm happy with it. Summertime might be a different story. i'll update it agin then.
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Old 01-23-2010, 09:26 PM   #16
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Re: Electric Cooling Fan How-to

running the the switch to a relay through ignition power would be best. try not to use just a toggle switch so you don't forget to turn it on
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Old 07-21-2010, 04:58 PM   #17
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Re: Electric Cooling Fan How-to

memphismatt: how 'bout an update?
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Old 07-22-2010, 09:39 PM   #18
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Re: Electric Cooling Fan How-to

That fan looks a lot like the replacement fan for the jeeps that someone here posted a while back. That's priced right and a fairly simple install. I'm like most of you in that I don't want to spend hundreds on a fancy dual setup for my DD.
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Old 07-28-2010, 07:17 AM   #19
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Re: Electric Cooling Fan How-to

Update: 7/28/2010

Well fellas, the cheapo electric fan has work very well in the Mississippi heat this summer! I have had absolutly no problems whatsoever. I changed the relay to a "key on" power source about 2 months ago. It preforms so flawlessly I kinda forgot about it.

Thats about it.

Kinda been wondering if it would work as well on the 454?!?
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Old 07-28-2010, 12:44 PM   #20
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Re: Electric Cooling Fan How-to

That's good to hear Matt. Thanks for the performance report. I'm wondering if it would handle mine towing a camper up some hills.
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Old 06-28-2011, 09:59 PM   #21
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Re: Electric Cooling Fan How-to

what model mopar does that fan come off of?
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Old 06-28-2011, 11:50 PM   #22
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Re: Electric Cooling Fan How-to

nice work but I'd rather have no fan shroud for a cleaner look, although it'd cut down on how well it worked I'm sure.
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Old 06-29-2011, 07:03 AM   #23
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Re: Electric Cooling Fan How-to

Quote:
Originally Posted by karlbenz View Post
what model mopar does that fan come off of?

The part number is CBG4F250, I bought mine here; http://www.moparonlineparts.com/part...&siteid=214954

If I remember their for a 2000/2001 Grand Cherokee......
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Old 07-01-2011, 12:07 AM   #24
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Re: Electric Cooling Fan How-to

And where did you wire the hot lead into so the fan only powers while the key is on? I am having the same issue and thought the fusable links would only come on when the key is turned, but the fan remains on after the key is removed. Thanks for the help!
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Old 07-03-2011, 06:45 AM   #25
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Re: Electric Cooling Fan How-to

Great post!!
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