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11-10-2016, 12:37 PM
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#1 |
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Registered User
Join Date: Apr 2013
Location: High springs Florida
Posts: 174
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Electric fans
I'm thinking of adding twin electric fans to my 71 has a 327 right now, to help with the A/c... should I remove the water pump fan or leave it there...
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11-10-2016, 01:00 PM
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#2 |
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Senior Member
 Join Date: Jul 2015
Location: Warrenton VA
Posts: 1,085
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Re: Electric fans
one or the other... Does your current fan have a shroud, the the stock set up when working correctly is enough to cool a big block with AC. What do you have as far as fan, radiator, clutch t-stat set up currently?
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71 c-10 Long Bed, under the knife for a No Limit Engineering Wide Ride Chassis Pack and coil over static drop. 07 Silverado Classic 2wd 95 Camaro 427SBC/TH350 |
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11-10-2016, 01:08 PM
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#3 |
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Registered User
Join Date: Apr 2013
Location: High springs Florida
Posts: 174
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Re: Electric fans
Stock fan, has a shroud,no clutch on fan... works good when truck is moving but when in slow or stopped A/C starts to blow less cold A/C... but when I put it in N give it some gas it blows cold... Just thinks fans would work better. got stuck in traffic alot..
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11-10-2016, 01:40 PM
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#4 |
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Registered User
Join Date: Mar 2016
Location: Long Island NY
Posts: 598
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Re: Electric fans
You could just add a pusher fan in front of the radiator and leave the stock fan and shroud in place. I did that to a work truck for the same reason. Eventually I did have the A/C gone over by a good shop who evacuated and then refilled the system which largely negated the need to have the additional pusher fan.
But if you're going through the trouble of adding one fan it's not much more to add a pair with a new shroud. You're already going to be doing the wiring with relay, some sort of fan controller, etc. Throw a little more cash at and you can have a pair of fans with a shroud behind the radiator and get rid of the stock fan and shroud. |
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11-10-2016, 03:38 PM
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#5 | |
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Registered User
Join Date: Oct 2012
Location: Rose Hill Kansas
Posts: 1,351
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Re: Electric fans
Quote:
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1970 C10 Short Stepper with 71/72 front clip. |
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11-10-2016, 04:15 PM
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#6 |
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Registered User
Join Date: Apr 2013
Location: High springs Florida
Posts: 174
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Re: Electric fans
A/c is 134 and level is fine..
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11-10-2016, 05:37 PM
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#7 |
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Registered User
Join Date: Oct 2011
Location: White Rock, BC
Posts: 41
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Re: Electric fans
Make sure you upgrade the alternator and wiring when you put the fans in. I didn't at first and the fans didn't work the way I wanted, found out that I was only at 10 amps at idle. Went to a 140amp Powermaster and twin spal fans, 4 gauge wiring across the front and it seems to fix the fax issue.
You may need your rad looked at, or your water pump is not working right. I replaced both and my big block rarely goes over 175, even in traffic. It has air as well.
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1967 Chev C10, in the family since 1967, iron head 502, turbo 350, white with red, unrestored. 1970 Acadian SS350, 350 with muncie 4 speed, 12 bolt, best time 13.414 @ 103.72 
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11-10-2016, 09:14 PM
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#8 |
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Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,945
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Re: Electric fans
First I would check the air flow. Is it only pulling through the radiator are is it going around it, that is the biggest reason your cooling effect isn't working at idle and slow speed.
The air has to be pulled through the radiator to cool not going over under are to the sides. 
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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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11-11-2016, 06:43 PM
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#9 |
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Farmtruck desciple
Join Date: May 2009
Location: 90605
Posts: 158
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Re: Electric fans
Consider a flex-fan prior to all the work needed to convert to electric fans (alternator upgrade, wiring, temp sensor, etc). Flex fans are deigned to move more air at idle and flatten out as the RPM's increase.
As for the A/C issue, start by assuring there is ample Freon volume in the system, that the ductwork is opening and closing as it should, and the vacuum switched heater core shut off is working. |
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11-12-2016, 07:38 AM
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#10 |
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laying low
Join Date: Mar 2001
Location: Searcy, Ark. USA
Posts: 13,435
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Re: Electric fans
It is completely normal for R134 to cool less at idle speed than at cruising speed. R134 operates better at higher pressure. Even the late model trucks cool less at idle speeds than running down the road. Part of it is air flow through the condenser and part of it is the increased compressor speed.
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Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross |
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