auxiliary / accessory fan???? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Gregs71 · 06-25-2011, 01:03 AM

I have an 89 k30 crewcab with 454. It has the auxiliary / accessory fan in front of the radiator (between grill and radiator). My question is, are these operated off accessories being on (like AC) or temperature controlled. It kicks on for 30-50 seconds when I first start the truck, but I don't know if its on when I am driving the truck.

My truck is running warm under load (230 degrees) and I am trying to figure out if it should come on at a certain temperature and how to test it???

Thanks,

Greg

kikkegek · 06-25-2011, 04:55 AM

+subscribing...I'd like to know too!

USSkoval · 06-25-2011, 08:15 PM

My '86 C20 Burb with 454 also has that electric fan. I don't know much about it's operation because (A) my temp gauge seems to read a little high, and (B) my AC system is inop.

But I do know that it kicked on once earlier this year when I was driving around in Orlando traffic. The gauge was reading like 245*-250*, but I suspect actual temp was 220* tops.

I also know that on a cold start, the clutch fan is pulling enough air that it causes the blades of the electric fan to spin, making it look like it's turned on.

gchemist · 06-25-2011, 08:58 PM

Can you snap a picture of the setup? I've never seen one installed. Does anyone know the width available between the grill and condenser? Distance between the radiator and condenser?

pig rig · 06-25-2011, 11:03 PM

it runs off a temp sensor on the pass side head if I remember right it comes on when the temp goes up over normal operating temp

greg71 whats your rad like have you ever blown it out it might be a little plugged up thats whats making it run hot

Gregs71 · 06-25-2011, 11:59 PM

Radiator looks good. Fins are straight and I can see thru them. The radiator is supposed to be about 6-8 years old. I have been wanting to put an infrared light on it to see if its hot in different places.

I thought that my gauge might be off, but I didn't know how to check it without buying another gauge. I am open to inexpensive ways to check my temp gauge.

06-25-2011, 01:03 AM	#1
Gregs71 Registered User Join Date: Nov 2006 Location: Amador County, Ca. Posts: 229	auxiliary / accessory fan???? I have an 89 k30 crewcab with 454. It has the auxiliary / accessory fan in front of the radiator (between grill and radiator). My question is, are these operated off accessories being on (like AC) or temperature controlled. It kicks on for 30-50 seconds when I first start the truck, but I don't know if its on when I am driving the truck. My truck is running warm under load (230 degrees) and I am trying to figure out if it should come on at a certain temperature and how to test it??? Thanks, Greg __________________ 1995 GMC 4x4 1/2 ton 1999 Jeep Wrangler w/ 33's 68 camaro 350/350 1987 Chevy 3/4 ton 4x4 Suzuki DRZ 400s Dual Sport 1971 chevy long bed 2x4 194? Dodge 2.5 ton 1980 Chevy Cheyenne 4x4 1/2 ton I6/sm455 1989 Chevy V30 crewcab dually 454/TH400

06-25-2011, 04:55 AM	#2
kikkegek Registered User Join Date: Aug 2010 Location: Netherlands, The Hague Posts: 1,518	Re: auxiliary / accessory fan???? +subscribing...I'd like to know too! __________________ My dreamride / project:1977 GMC C15 Suburban In storage: Monster - 1974 GMC Suburban 25hundred Sold : Chevrolet Suburban K20 Silverado 1986 Guide: real HID projectors for 4x6 headlights link: DIY LED TAILLIGHTS

06-25-2011, 08:15 PM	#3
USSkoval Registered User Join Date: Jul 2009 Location: West Jefferson, OH Posts: 999	Re: auxiliary / accessory fan???? My '86 C20 Burb with 454 also has that electric fan. I don't know much about it's operation because (A) my temp gauge seems to read a little high, and (B) my AC system is inop. But I do know that it kicked on once earlier this year when I was driving around in Orlando traffic. The gauge was reading like 245-250, but I suspect actual temp was 220* tops. I also know that on a cold start, the clutch fan is pulling enough air that it causes the blades of the electric fan to spin, making it look like it's turned on. __________________ -Andy '77 K5 Blazer '78 K10 Shortbed '78 C20 Suburban '79 K30 Crew Cab Dually '84 C10 Short Stepside '88 K20 Suburban

06-25-2011, 08:58 PM	#4
gchemist BAD BOW-Silverado XST Join Date: May 2000 Location: Senior Member from Austin, TX Posts: 6,431	Re: auxiliary / accessory fan???? Can you snap a picture of the setup? I've never seen one installed. Does anyone know the width available between the grill and condenser? Distance between the radiator and condenser? __________________ Gerardo a.k.a. Mad Chemist Silverado XST videos

06-25-2011, 11:03 PM	#5
pig rig Registered User Join Date: Feb 2009 Location: washington the state Posts: 730	Re: auxiliary / accessory fan???? it runs off a temp sensor on the pass side head if I remember right it comes on when the temp goes up over normal operating temp greg71 whats your rad like have you ever blown it out it might be a little plugged up thats whats making it run hot __________________ my sports car rolls on six wheels only because I'm to fat to get in and out of new corvette http://hubgarage.s3.amazonaws.com/ph...ped_detail.JPG

06-25-2011, 11:59 PM	#6
Gregs71 Registered User Join Date: Nov 2006 Location: Amador County, Ca. Posts: 229	Re: auxiliary / accessory fan???? Radiator looks good. Fins are straight and I can see thru them. The radiator is supposed to be about 6-8 years old. I have been wanting to put an infrared light on it to see if its hot in different places. I thought that my gauge might be off, but I didn't know how to check it without buying another gauge. I am open to inexpensive ways to check my temp gauge. __________________ 1995 GMC 4x4 1/2 ton 1999 Jeep Wrangler w/ 33's 68 camaro 350/350 1987 Chevy 3/4 ton 4x4 Suzuki DRZ 400s Dual Sport 1971 chevy long bed 2x4 194? Dodge 2.5 ton 1980 Chevy Cheyenne 4x4 1/2 ton I6/sm455 1989 Chevy V30 crewcab dually 454/TH400



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