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howell57 11-10-2019 06:24 PM

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 and they need the numbers??

DJStucker 11-11-2019 01:46 PM

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.

HO455 11-11-2019 01:55 PM

Re: Chevy radiator fans draw
Have you tried looking up what the fan fuse rating is?

howell57 11-11-2019 02:27 PM

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.

morepwr 11-11-2019 05:50 PM

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.

howell57 11-11-2019 07:20 PM

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.

MDPotter 11-12-2019 11:27 AM

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.

howell57 11-12-2019 12:01 PM

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.

Wrenchbender Ret 11-12-2019 12:40 PM

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.

Andy4639 11-12-2019 12:47 PM

Re: Chevy radiator fans draw
Always run fans with relays! Always. If you want the variable speed hook it up to trigger the relay.:chevy:

howell57 11-12-2019 01:17 PM

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.

howell57 11-18-2019 02:16 PM

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???

MDPotter 11-18-2019 07:25 PM

Re: Chevy radiator fans draw

howell57 11-18-2019 08:25 PM

Re: Chevy radiator fans draw

howell57 11-18-2019 08:46 PM

Re: Chevy radiator fans draw
Had my son post pictures as I would have never been able to do it!

Andy4639 11-19-2019 06:13 AM

Re: Chevy radiator fans draw
2 Attachment(s)
I resized your pictures, so we can see them better.

I think it looks good.

I'm not going to use the radiator but have been wondering if the AC condenser would work in a 67/72 truck? This pretty much say's it should. I think when I add the AC to my daughters truck I'll piece it together and use a late model condenser and stuff.

howell57 11-19-2019 03:17 PM

Re: Chevy radiator fans draw
Thanks for the resizing. My son uploaded the pictures remotely from his computer and may not have realized that they were seen that big.
Been trying to get information from GM and Bosch on the OEM fan assembly and no one will give me the time of day! Now I find out that GM is suing Bosch over their fuel injectors on the Duramx engines. Just looking for two pieces of information, amp draw of the Bosch fan motors and purpose of small third wire to the motor.

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