Chevy radiator fans draw - The 1947 - Present Chevrolet & GMC Truck Message Board Network

howell57 · 11-10-2019, 06:24 PM

I have looked long and hard, but can not find the DC draw of dual OEM Chevy truck fans. I'm putting an OEM (2019) radiator fan assembly into my 72 C10 and need a fan relay system. I think AC Delco makes them for GM. Going through autocoolguy.com and they need the numbers??

DJStucker · 11-11-2019, 01:46 PM

Hard to say without a part number. Aftermarket fan data is much more available than OEM. I’d assume if they are dual fans they will be somewhere between 30 and 50 amps. Don’t use a relay though, use a variable speed controller(s). They a MUCH easier on your charging system, and last longer than a relay. I have dual Spal fans and they pull 23 amps each so I have 2 variable speed controllers.

**HO455** · 11-11-2019, 01:55 PM

Have you tried looking up what the fan fuse rating is?

howell57 · 11-11-2019, 02:27 PM

I know they are PMW fans and I have a part # for ACDelco 13592144 which is the OEM part. I will wait till I get the fan assembly and see if there are any numbers on it or have my son use a multimeter and hook them up to a battery and see what the startup draw is and full on draw.
TKX

morepwr · 11-11-2019, 05:50 PM

Make sure your alternator is rated for high enough amps. I have burned out an alternator before learning this little bit of info.

howell57 · 11-11-2019, 07:20 PM

Using all OEM items. Engine is a 2018 L83 and I'm sure the alternator is a 150 amp unit.

**MDPotter** · 11-12-2019, 11:27 AM

Not to hijack your thread, but I'm interested to see how you install a 2019 radiator/fan assembly into your 72. I've looked at doing a similar install but with a 2006 radiator but they're too long to fit in the core support from my research.

howell57 · 11-12-2019, 12:01 PM

No problem! My thought is to mount the 40" radiator to the two vertical supports facing the engine. Center to center is just about 40". I have 6" from the face of those supports to the water pump pulley. The radiator and fan assembly is 4", should have 2" clearance. I have moved the battery and will move the horns. In order to maximize air flow, I could cut the core support to open it up to the two front vertical imprints on the core. I will be getting the assembly Wednesday, put the two units together and see how they fit.

howell57 · 11-18-2019, 02:16 PM

Did some metal work on support core and temporarily installed it. It fits snug with about 1&1/2" clearance. Fan support was thicker than I thought. This fan assembly has Bosch motors and that is unusual in that I thought they would be AC Delco, but it did come out of an 2019 Chevy Silverado???

**MDPotter** · 11-18-2019, 07:25 PM

Pictures?

Wrenchbender Ret · 11-12-2019, 12:40 PM

I can't imagine running those fans without relay/s. With all the controllers & switches that the current goes through, it would put an extreme load on them, besides voltage loss through all the circuits.
George

Andy4639 · 11-12-2019, 12:47 PM

Always run fans with relays! Always. If you want the variable speed hook it up to trigger the relay.

howell57 · 11-12-2019, 01:17 PM

ACDelco part # 13592144 is the OEM relay for this fan assembly. Chevy dealer says that there is only one relay to run both PWM fans. I've tried very hard to set it up as it came from factory. There is a 5 volt green trigger wire that turns the fans on from the ECU. System is set for variable speed fans.

11-10-2019, 06:24 PM	#1
howell57 Registered User Join Date: Sep 2018 Location: Redding, Calif. Posts: 101	Chevy radiator fans draw I have looked long and hard, but can not find the DC draw of dual OEM Chevy truck fans. I'm putting an OEM (2019) radiator fan assembly into my 72 C10 and need a fan relay system. I think AC Delco makes them for GM. Going through autocoolguy.com and they need the numbers??

11-11-2019, 01:46 PM	#2
DJStucker Registered User Join Date: Jun 2018 Location: Los Angeles, CA Posts: 27	Re: Chevy radiator fans draw Hard to say without a part number. Aftermarket fan data is much more available than OEM. I’d assume if they are dual fans they will be somewhere between 30 and 50 amps. Don’t use a relay though, use a variable speed controller(s). They a MUCH easier on your charging system, and last longer than a relay. I have dual Spal fans and they pull 23 amps each so I have 2 variable speed controllers.

11-11-2019, 01:55 PM	#3
HO455 Post Whore Join Date: Feb 2016 Location: Portland Oregon Posts: 11,350	Re: Chevy radiator fans draw Have you tried looking up what the fan fuse rating is? __________________ Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377

11-11-2019, 02:27 PM	#4
howell57 Registered User Join Date: Sep 2018 Location: Redding, Calif. Posts: 101	Re: Chevy radiator fans draw I know they are PMW fans and I have a part # for ACDelco 13592144 which is the OEM part. I will wait till I get the fan assembly and see if there are any numbers on it or have my son use a multimeter and hook them up to a battery and see what the startup draw is and full on draw. TKX

11-11-2019, 05:50 PM	#5
morepwr Registered User Join Date: Jun 2018 Location: Ventura, Ca Posts: 206	Re: Chevy radiator fans draw Make sure your alternator is rated for high enough amps. I have burned out an alternator before learning this little bit of info. __________________

11-11-2019, 07:20 PM	#6
howell57 Registered User Join Date: Sep 2018 Location: Redding, Calif. Posts: 101	Re: Chevy radiator fans draw Using all OEM items. Engine is a 2018 L83 and I'm sure the alternator is a 150 amp unit.

11-12-2019, 11:27 AM	#7
MDPotter Senior Member Join Date: Aug 2018 Location: Western Colorado Posts: 1,165	Re: Chevy radiator fans draw Not to hijack your thread, but I'm interested to see how you install a 2019 radiator/fan assembly into your 72. I've looked at doing a similar install but with a 2006 radiator but they're too long to fit in the core support from my research. __________________ 1964 Chevy C10 - Gen IV 5.3 Restomod http://67-72chevytrucks.com/vboard/s...d.php?t=768632 1968 GMC C15 - Gen III 6.0 Restomod http://67-72chevytrucks.com/vboard/s...d.php?t=772047 1969 Chevy C10 - Restoration http://67-72chevytrucks.com/vboard/s...d.php?t=809184 1978 Chevy Scottsdale K20 1993 Chevy C1500 - 5.3/T56 swapped 2008 Silverado Duramax

11-12-2019, 12:01 PM	#8
howell57 Registered User Join Date: Sep 2018 Location: Redding, Calif. Posts: 101	Re: Chevy radiator fans draw No problem! My thought is to mount the 40" radiator to the two vertical supports facing the engine. Center to center is just about 40". I have 6" from the face of those supports to the water pump pulley. The radiator and fan assembly is 4", should have 2" clearance. I have moved the battery and will move the horns. In order to maximize air flow, I could cut the core support to open it up to the two front vertical imprints on the core. I will be getting the assembly Wednesday, put the two units together and see how they fit.

11-18-2019, 02:16 PM	#9
howell57 Registered User Join Date: Sep 2018 Location: Redding, Calif. Posts: 101	Re: Chevy radiator fans draw Did some metal work on support core and temporarily installed it. It fits snug with about 1&1/2" clearance. Fan support was thicker than I thought. This fan assembly has Bosch motors and that is unusual in that I thought they would be AC Delco, but it did come out of an 2019 Chevy Silverado???

11-18-2019, 07:25 PM	#10
MDPotter Senior Member Join Date: Aug 2018 Location: Western Colorado Posts: 1,165	Re: Chevy radiator fans draw Pictures? __________________ 1964 Chevy C10 - Gen IV 5.3 Restomod http://67-72chevytrucks.com/vboard/s...d.php?t=768632 1968 GMC C15 - Gen III 6.0 Restomod http://67-72chevytrucks.com/vboard/s...d.php?t=772047 1969 Chevy C10 - Restoration http://67-72chevytrucks.com/vboard/s...d.php?t=809184 1978 Chevy Scottsdale K20 1993 Chevy C1500 - 5.3/T56 swapped 2008 Silverado Duramax

11-12-2019, 12:40 PM	#11
Wrenchbender Ret Registered User Join Date: Oct 2005 Location: Overland Park, Ks. Posts: 5,229	Re: Chevy radiator fans draw I can't imagine running those fans without relay/s. With all the controllers & switches that the current goes through, it would put an extreme load on them, besides voltage loss through all the circuits. George

11-12-2019, 12:47 PM	#12
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,945	Re: Chevy radiator fans draw Always run fans with relays! Always. If you want the variable speed hook it up to trigger the relay. __________________ 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.

11-12-2019, 01:17 PM	#13
howell57 Registered User Join Date: Sep 2018 Location: Redding, Calif. Posts: 101	Re: Chevy radiator fans draw ACDelco part # 13592144 is the OEM relay for this fan assembly. Chevy dealer says that there is only one relay to run both PWM fans. I've tried very hard to set it up as it came from factory. There is a 5 volt green trigger wire that turns the fans on from the ECU. System is set for variable speed fans.



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