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#1 |
Registered User
Join Date: Jan 2016
Location: Bowling Green, Ky
Posts: 40
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Electric fan conversion on 87 gmc complete (kinda)
Just wanted to give my account on how I converted my truck to electric fans.
Broke this down into 3 stages. First is design, second is electric install, and last is fan installation. Design. Decided to go with duel fans off a ls camaro. I've seen other people run single fans off a thunderbird, but got a good deal on the fan I acquired. I drew out a wiring schematic just to make sure I understood the theory of how it would work. ![]() Basically, the trinary switch and temperature switch will control the circuit by connecting the control wire to ground through the relay. Control power is pulled from an ignition source. Electric install. I purchased all my relays, fuses, temperature switch, and plugs from summit. Everything else came from the local parts store. I started by finding a power source on top of the motor. I just took a meter and poked around until I found a source that was 0v with the key off and 12v with the key on. ![]() I spliced in a 1 amp in line fuse to feed the control side of both my relays. During my serpentine conversion I installed a water pump off a mid 90s truck. That had a port in the top. That is where I installed the temperature switch. ![]() ![]() I wanted to put a junction block fed from a 60 amp fuse from the battery. Unfortunately, I didn't have room. I ran two separate feeds straight from the battery terminal to 30 amp fuses feeding the control relays. I mounted those just under the fresh air duct inlet. Here is a picture of the fuses and relays. ![]() I have yet to install a trinary or bypass switch. The fans were wired in the load side of the relay. I grounded each one to the core support. I'm not including any info on wiring, as that will be to your specific needs, and mines a lot of detail to explain.. Fan install of the fan. I wanted it to look fairly stock after install, so i did ny best to retain my stock fan shroud. I started by sitting the fans on lower fan shroud. I had to do some trimming on the tabs to make the fans sit in the shroud the way I'd like, as they were interfering with various locations. I just used a utility knife to do that. ![]() I drilled a couple holes for the cables to come through, and the lower was done. Once I was done with the lower I tried test mounting just throwing the top shroud in. It was to loose not to have a retaining method. I removed the tabs that secure the upper shroud and made a bracket to hold both the fan and upper shroud on. ![]() Once that was complete I reinstalled everything and the install was complete (minus ac wiring circuit). ![]() ![]() Any questions or comments, let me know. |
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#2 |
Registered User
Join Date: Jan 2014
Location: Swaledale, IA
Posts: 485
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Re: Electric fan conversion on 87 gmc complete (kinda)
I have a question - why did you put the stock shroud back on? seems like it wouldn't have a purpose with the engine fan removed?
Also - just an FYI - the port in the top of the water pump doesn't get all that hot - I tried putting my CTS sensor there in my updated SBC (intake didn't have a dedicated port for one). I monitored it on my laptop through the ECM and the highest it would get was around 170 degrees. I got bad mileage when it was there because it was not going into the closed loop, I plumbed it back into the intake and it was much better. |
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