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#1 |
Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,936
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Ok guy's I have been searching for a answer to my fans running all the time when I'm on the road at speed with the AC on. We all know that these fans are expensive and burning up $300.00 worth of electric fans isn't going to be fun no matter when they go out, so I finally think I have it figured out. I ran out of time so I'm going to test drive it tomorrow after work and see.
I even came up with a little light to tell me if it's working are not. I don't know if I'll keep it in the truck are not we will see. Really depends on how bright it is when it's on. Ok here is what I did: I wired a micro switch into the AC on wire to the relay I added a few weeks ago. Like in the picture with the arm extended with a flap on it to catch the air and turn off the fans once it see's enough air flow. I have it mounted inside the grill. Hopefully it has enough wind when driving it to shut off. I bolted it in place and put my fan in the front of the truck and it shut off so I hope it works. Adjustments will be done by either making a bigger paddle are trimming the one on it now. ![]() ![]()
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1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 ![]() Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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#2 |
Registered User
Join Date: Oct 2012
Location: Green Valley Arizona
Posts: 1,351
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Re: My $5.00 fix
Subscribed...it will be interesting to see how much your temperature changes "at speed" when your fans stop pulling air when the micro switch cut the power.
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1970 C10 Short Stepper with 71/72 front clip. |
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#3 |
Registered User
Join Date: Jan 2011
Location: Chattanooga, TN
Posts: 2,151
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Re: My $5.00 fix
Can't speak to an LS engine control, but on a TunedPort you have to have a high pressure a/c switch to tell the fans to turn off at speed. If the circuit is open then the fans run as long as there is power to the a/c. If the pressure is not high then it sends a ground and the fans do not run constantly.
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'83 K20-TPI '73 C10 '79 C10-ex-diesel(SOLD) '07 Tahoe(Son driving) '14 Suburban-DD '71 C10-current project |
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#4 |
Registered User
Join Date: Aug 2006
Location: Redmond, WA
Posts: 6,332
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Re: My $5.00 fix
That's a cool idea... as soon as I saw it, I knew what it was for, but wouldn't have thought of it!
Did you ever consider that will road air flow the fans aren't being worked very hard anyway because the motors are being assisted by the airflow through the grille? I don't know if that actually makes them last longer, but it might take load off them. Or maybe they have the exact same load and just spin faster, I don't really know...
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1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible |
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#5 | |
Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,936
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I had a tuned port for over 15 years but I ran the engine clutch fan all the time. I never had electric fans. Well I did but had it turned on by the AC fan switch not the PCM. The LS fans work off the ground of the PCM also if the water temp reaches 185*. If I have the AC on it sends the ground signal to both of the fans to come on no matter what the water temperature is. It over rides the PCM ground. BugzC10, The water temp pretty much stays at 179* all the time when at speed weather the AC is on are not. The fans hardly ever come on when driving it only in traffic are idling. davepl, Over heating isn't why I did this it was purely to keep the fans off when I'm moving which I hope will extend the life of them. The fans are rated at 3100CFM when both are running. I looked for several weeks into what was out there for this kind of setup and everything was way more than I wanted to spend on it. This is simple and cheap. $269.99 ![]() ![]() $119.95 ![]() $5.00! Over all it does the same thing as the top two with less things to go wrong with it. If it fails all that happens is the fans stay on all the time. I'm going to wire the small light up tonight to let me know when the fans have power and when it goes off it tells me the fans are off. Simple!
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1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 ![]() Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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#6 |
Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,936
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Just finished up this little mod!
Wired a small green light into the dash so I know when the fans are running. The paddle cuts them off @20-25 MPH and back on when I slow down as long as the AC is on. When not the only time they will run is @ 185*! Couldn't be more happier. ![]()
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1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 ![]() Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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#7 | |
Senior Member
![]() Join Date: Feb 2010
Location: Falls City, Nebraska "100 Miles From Nowhere"
Posts: 2,219
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Re: My $5.00 fix
Quote:
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Michael of the clan Hill, "Two Seventy Two's" 71 1-ton Dually 350 4-Speed 71 C/50 Grain Truck, 350 Split-Axle 4-Speed 02 3/4 ton Express 14 Indian Chief Vintage 1952 Ford 8N, "Only Ford Allowed On The Property" ![]() "Be American, Buy American" ![]() |
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#8 | |
Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,936
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![]() Quote:
It's a done deal as we speak! ![]()
__________________
1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 ![]() Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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#9 |
Registered User
Join Date: Sep 2015
Location: Rogersville, MO
Posts: 82
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Re: My $5.00 fix
CLever use of a sail switch and infinitely adjustable. Very resourceful
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#10 | |
Registered User
Join Date: Aug 2012
Location: Midland, TX
Posts: 1,267
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Re: My $5.00 fix
Quote:
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1969 RS/SS Z10 Camaro Pace coupe 1972 GMC Short Step buildhttp://67-72chevytrucks.com/vboard/s...=1#post6356218 1979 Mazda RX7 1979 Pontiac Trans Am WS6 & 1979 Pontiac Trans Am 10th Anniversary 1999 Honda Valkyrie 2006 Corvette Z06 2010 BMW 650i |
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#11 |
Registered User
![]() Join Date: Jan 2013
Location: portland oregon
Posts: 156
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Re: My $5.00 fix
I wonder what the lateral tolerances of that switch are ? I don't think the design parameters included this. It's a really cool idea, though. I imagine it flicking on and off all the time on a bumpy road, and that would be rather hard on the fan motors and fuses. I wonder if a speed sensor and a relay might not accomplish the same goal in a different manner.
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#12 | |
Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,936
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![]() Quote:
I don't thing it will be any problem at all. ![]()
__________________
1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 ![]() Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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#13 |
Registered User
Join Date: Apr 2008
Location: Md
Posts: 2,475
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Re: My $5.00 fix
"Brilliant Idea" Andy!
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http://67-72chevytrucks.com/vboard/s...d.php?t=635605 |
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#14 |
Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,936
|
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__________________
1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 ![]() Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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