Electric fan/ A/C question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

nuc_meltdown · 08-27-2021, 09:25 AM

I swapped my 02 1500 5.3 over to electric fans using the BP Automotive wiring harness. I also replaced the water pump, thermostat, radiator and hoses. I can't get the temp over 210. My buddy programmed the fans to operate at what an 06 would and that is 215. Will this be ok? I mean if it doesn't need it that's fine. Right?
Also, i bought the harness(BP as well)to make the fans come on when the A/C comes on. BP says it has to be programmed in as well, but my buddy says there's not a way he is aware of to do it without doing a segment swap from an Fbody because my truck doesn't have any way to operate the fans with the A/C. I don't really know either. Anyone give me some guidance? Thanks!

**hatzie** · 08-27-2021, 04:51 PM

If the BCM doesn't have a current limiter on the AC clutch circuit you may be able to use a relay teed into the compressor wiring to drive the radiator fan.

08-27-2021, 09:25 AM	#1
nuc_meltdown Registered User Join Date: Oct 2015 Location: killen, Al Posts: 20	Electric fan/ A/C question I swapped my 02 1500 5.3 over to electric fans using the BP Automotive wiring harness. I also replaced the water pump, thermostat, radiator and hoses. I can't get the temp over 210. My buddy programmed the fans to operate at what an 06 would and that is 215. Will this be ok? I mean if it doesn't need it that's fine. Right? Also, i bought the harness(BP as well)to make the fans come on when the A/C comes on. BP says it has to be programmed in as well, but my buddy says there's not a way he is aware of to do it without doing a segment swap from an Fbody because my truck doesn't have any way to operate the fans with the A/C. I don't really know either. Anyone give me some guidance? Thanks! __________________ 1963 Chevy C-10 long stepper. 1984 Chevy K-10 lwb

08-27-2021, 04:51 PM	#2
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,977	Re: Electric fan/ A/C question If the BCM doesn't have a current limiter on the AC clutch circuit you may be able to use a relay teed into the compressor wiring to drive the radiator fan. __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful.



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