which is better?? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

72gmcshorty · 07-15-2003, 08:30 PM

Should I get a flex fan or a dual fan setup from a junkyard? Which setup works better? I don't have a shroud and am having cooling problems (at idle). I have a four core rad and a tranny cooler.

lpaine · 07-15-2003, 09:12 PM

It seems odd that you have cooling problems with a 4 row rad, maybe you need a lower temp. thermostat, is your water pump ok? What lbs. pressure rad cap are you using? Give the cooling system a thorough going over before you spend $ on any upgrades. Or maybe the system just needs a flush. Just my .02. Keep on truckin'

72gmcshorty · 07-15-2003, 09:27 PM

I'm not sure about the temp of the thermostat. I run a old school four blade fan and it sits about six inches away from the rad. It also runs constantly. I would like to get a dual fan setup but if a flex fan works just as good i'll go with it. The fluid is new and so is the rad.

gmc67swb · 07-15-2003, 09:32 PM

Quote:

Originally posted by 72gmcshorty
Should I get a flex fan or a dual fan setup from a junkyard? Which setup works better? I don't have a shroud and am having cooling problems (at idle). I have a four core rad and a tranny cooler.

IF YOU CAN GET A SHROUD, THIS WILL MORE THAN LIKELY FIX YOUR COOLING PROBLEM AT IDLE. I TOO HAD THIS PROBLEM AT IDLE WITHOUT A SHROUD. MY PROBLEM WAS THAT I HAVE AN ALUMINUM 2 ROW RADIATOR FROM GRIFFIN AND A STOCK SHROUD WOULD NOT FIT. I BOUGHT A SINGLE ELECTRIC FAN FROM SUMMIT AND A THERMOSTAT TO TURN IT OFF AND ON AND HAVEN'T HAD ANY PROBLEMS SINCE.

Longhorn Man · 07-15-2003, 11:01 PM

Yes, the missing shroud is the problem. The fan can not pull the air through the fan properly, it is just sucking air from where ever.
Your best bet, and probably the most cost effective, would be to get a clutch fan, upgrade to a better fan with 6 or so blades, and install a shroud.The flex fans are hand gernades waiting to explode and rip through your hood and who ever is in it's way.

07-15-2003, 08:30 PM	#1
72gmcshorty Registered User Join Date: Jul 2001 Location: North Delta, British Columbia Posts: 1,344	which is better?? Should I get a flex fan or a dual fan setup from a junkyard? Which setup works better? I don't have a shroud and am having cooling problems (at idle). I have a four core rad and a tranny cooler. __________________ 1992 Gmc 2wd 1972 Chevy Blazer 2wd

07-15-2003, 09:12 PM	#2
lpaine Registered User Join Date: Oct 2002 Location: Parksville, B.C. Canada Posts: 637	It seems odd that you have cooling problems with a 4 row rad, maybe you need a lower temp. thermostat, is your water pump ok? What lbs. pressure rad cap are you using? Give the cooling system a thorough going over before you spend $ on any upgrades. Or maybe the system just needs a flush. Just my .02. Keep on truckin' __________________ 1969 G.M.C 3/4 Ton 920 (Canadian Version) 307 3 speed, currently apart 1998 Chevy 1/2 ton ex cab V-6 5 speed 1967 Chevy SWB - project truck; not started just yet

07-15-2003, 09:27 PM	#3
72gmcshorty Registered User Join Date: Jul 2001 Location: North Delta, British Columbia Posts: 1,344	I'm not sure about the temp of the thermostat. I run a old school four blade fan and it sits about six inches away from the rad. It also runs constantly. I would like to get a dual fan setup but if a flex fan works just as good i'll go with it. The fluid is new and so is the rad. __________________ 1992 Gmc 2wd 1972 Chevy Blazer 2wd

07-15-2003, 11:01 PM	#5
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Yes, the missing shroud is the problem. The fan can not pull the air through the fan properly, it is just sucking air from where ever. Your best bet, and probably the most cost effective, would be to get a clutch fan, upgrade to a better fan with 6 or so blades, and install a shroud.The flex fans are hand gernades waiting to explode and rip through your hood and who ever is in it's way.



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