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Thread: E-fan install 1991 Suburban
03-19-2013, 11:18 AM #1
E-fan install 1991 Suburban
Well, those of you that have been around GMTC for a while know that I can't keep my tools off my Suburban, and this is no different. I am working on installing an electric fan on my 1991 Chevy Suburban. Why am I doing this? The answer is that the mechanical fan takes up a lot of space and isn't the most efficient at moving air, particularly while idling. It's hot down here, so air not moving over the a/c coils means it's not as cold as it can be, though to be honest the a/c worked pretty well before. The fan of choice for this project is the Lincoln Mark VIII fan. Why the Mark VIII fan? Well, it's fabled as the fan that moves the most air out on the market; claimed CFM is 4000+ but noone can agree exactly how much. Another excellent choice of fan are from Ford Tauruses, and while I have a couple of those fans, the CFM is supposedly not as much, though still high. I scored the fans for just under $20 each. So, let's get installin'!
So, here's what I'm starting with, a boring 20-year old mechanical fan and insanely huge shroud:
So, let's try to modernize it some. I took off the upper shroud and there's already a good bit of space freed up:
Here I've completely removed the fan and shroud. It's so cavernous, I think I can hide in there with the engine. You can also see my triple hose clamp job for my transmission cooler lines:
Next, I plopped the new fan in the engine compartment to try to get a feel of where I wanted to put it. About center looked good and seemed to cover most of the radiator. I'd say I have 80% coverage by the shroud:
Looking at what I had to work with, I decided that I could reuse the mounting points for the lower fan shroud to mount the bottom of the fan and I'd fab up new mounts for the top. So, I took some aluminum flat bar and bent up a couple of 90-degree tabs:
I then put the fan back in the hole, made a couple of measurements, and mounted the tabs to the bottom of the fan:
I cut off the original factory mounting tabs with a hacksaw since they would not be used to clean up the sides:
I took some measurements for the top mounts, sketched them up, and bent up a bracket that I would later duplicate for the other side:
And then installed the fan for the last time:
So, all the mechanical install is done. Now, I need to decide what I'm doing for the fan control. It is a 2-speed fan, and I can decide to operate it just in one speed, or step it between the 2, but either way, I need to find a fan controller. The alternative is to try to roll my own fan control setup with a temp switch and a constant-duty relay. Any suggestions on what I should do for the electrical?
Last edited by Crawdaddy; 03-19-2013 at 12:18 PM.Christopher
1991 Chevy Suburban 1/2 ton 2WD w/ chevy SBC 350-3/4 ton drivetrain upgrade w/4.10 gears 199K miles
2005 Saturn ION-2 Stock 255K miles
1982 Bronco, 1993 Bronco (sold), 1971 M35A2 Deuce and a Half
There are 10 kinds of people, those who understand binary, and those who dont...
Remember kids, the only difference between screwing around and science is writing it down- Adam Savage
03-19-2013, 11:48 AM #2
Nice work! You made it look easy. I have seen some other installs that make it look like a pain.
1995 Silverado 4x4
6" BDS Suspension Lift-3" Body Lift-Add A Leaf in rear -Trailmaster SSV Shocks-Duel Steering Stabilizer Kit -AirAid Cold air intake-
4.56 Gears with Detroit Auburn Locker-Pro-Comp Traction Bars with duel shocks-Aluminum Skid Plate Kit-38.5" x 16.5" Mickey Thompson Baja Claws-Constant Dropping fuel gauge
2005 Yukon XL Jet Power Programmer, Bilstein Shocks, Bilstein rear springs, Helwig Anti-sway bars, EGR Window Visors, EGR Hood Shield, Denali Headlights, Headlight harness upgrade, GE NightHawk Bulbs, White Night Rear lighting system http://www.gmtruckclub.com/forum/sho...5-GMC-Yukon-XL
2002 Silverado ext cab 2wd (Sold)
2003 Yukon XL (Totaled)
03-19-2013, 12:29 PM #3
That was about 5 hours of work that I spread over 2 weekends. The brackets aren't perfect and pretty because I bent them in a vise with a crescent wrench and hammer, and overall it's not show quality, but nothing on the truck is. I'm happy so long as it works.
I am considering rolling my own fan controller with a fixed temp switch and a constant-duty relay. However, I'm still up in the air where I'd put the temp switch. Right at the thermostat housing seems to make sense, but I haven't found a water neck with a sender port that will fit the application yet. There's a pipe plug in the passenger head that's used on the drivers head for the engine temp gauge, but I don't know if that would make the fan never turn off because the temp would never get below the trip point. It might work if I used a 210 degree switch, but I'm still unsure. I am VERY much open to suggestions. Electrical is my forte, but this also entails thermo-mechanical engineering too. Collinsperformance has a similar write-up with a Taurus fan on his motorhome, but I can't find it at the moment. It used to be stickied.
EDIT: it wasn't Tim, it was Collinsperformance. Here's a link to his thread: http://www.gmtruckclub.com/forum/sho...as-Fan-Install
Last edited by Crawdaddy; 03-19-2013 at 12:58 PM.
03-19-2013, 01:54 PM #4
03-19-2013, 02:41 PM #5
That might just be the ticket for putting a temp switch in. I am concerned that the height/angle of the outlet might put it right in line with the reinforcing bracket for the a/c compressor and belt tensioner. I'm gonna see if my friend can get one for me to check out.
03-19-2013, 02:43 PM #6
There are a few different types on that site. I am sure if you google it you may find the correct outlet angle.
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