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79BIG10 · 08-12-2006, 02:44 PM

that's the return line from your heater core. You will have a line from the top of the intake to the heater core port on the firewall then the return goes back into the radiator port you have there. I've added a valve where the supply line to the heater core can be shut off during summer. This keeps the cab a little bit cooler. Just make sure to do the supply side from the intake and not the other side after the heater core to the radiator. This would cause the heater core to burst. Also if you install it make sure to run it open about once a month to keep it flushed out.

08-12-2006, 02:44 PM	#3
79BIG10 I'm back with 2nd truck! Join Date: Feb 2002 Location: Texas Posts: 3,774	Re: Radiator Question that's the return line from your heater core. You will have a line from the top of the intake to the heater core port on the firewall then the return goes back into the radiator port you have there. I've added a valve where the supply line to the heater core can be shut off during summer. This keeps the cab a little bit cooler. Just make sure to do the supply side from the intake and not the other side after the heater core to the radiator. This would cause the heater core to burst. Also if you install it make sure to run it open about once a month to keep it flushed out. __________________ 1979 Chevrolet Bonanza Big10 "Tootsie Roll" 1985 Chevrolet Silverado (wife's) Member of the Southern Bowties Club "Don't underestimate how sexy a fat man who drinks to excess can be." Homer Simpson Last edited by 79BIG10; 08-12-2006 at 02:56 PM.