Radiator Is now puking - The 1947 - Present Chevrolet & GMC Truck Message Board Network

1-PU70 · 08-31-2009, 05:06 PM

I have a 70 C10 with a 402 and a 4 core radiator. Its been blowing hot air through the AC outlets so for a quick fix I disconnected the heater core. Just cut the hoses and made a u out of PVC to reconnect the hoses to instead of just plugging the hoses. Now every time I shut it off it pukes coolant out the overflow line. There is no overflow bottle never was one. It drains the coolant to the bottom of the radiator. Why would it start just by disconnecting the heater core? I did replace the cape but no change.

grancuda · 08-31-2009, 05:19 PM

Mine pukes it out to a certain level then stops, about 1" below the radiator cap. Possibly you filled it but it had been staying at a lower level?

68gmsee · 08-31-2009, 05:25 PM

Your heater core and hoses were acting as a reservoir and heat exchanger. Now the extra heat is creating pressure causing your problem.

Is your truck overheating at all? If not, do a search on overflow tank and see what others have done. I made one out of black piping I got at Lowes. Cost was about 10 dollars or so. There are other more expensive ones you can purchase.

69GMCLonghorn · 08-31-2009, 05:28 PM

Quote:

Originally Posted by grancuda

Mine pukes it out to a certain level then stops, about 1" below the radiator cap. Possibly you filled it but it had been staying at a lower level?

By disconnecting those lines, you have diminished the capacity of the cooling system. Maybe it is enough that when you shut it off and it heats up a little bit (which is when they get the hottest), it's boiling over. You can get an aftermarket bottle and install it on the inner fender well or 100 other places depending on how creative you want to be. I've done this on my older vehicles and saved a lot of "topping off" with coolant.

1-PU70 · 08-31-2009, 05:33 PM

I was going to try the overflow bottle but after a couple of drives it just about drains the entire radiator. The truck runs about 185 so it not overheating.

68gmsee · 08-31-2009, 05:36 PM

Quote:

Originally Posted by 1-PU70

I was going to try the overflow bottle but after a couple of drives it just about drains the entire radiator. The truck runs about 185 so it not overheating.

If it's draining that much out, I'd replace the cap first if you haven't done so already. Also, make sure you're getting the proper pressure cap for your engine. And for sure, I'd get an overflow bottle.

1-PU70 · 08-31-2009, 06:40 PM

Well I just went out and added an overflow tank. Had one from my Jeep. I started her up and let it run for a while. For some reason I was checking the U I made from PVC and its cracked. The coolant is funning down the inner fender and dripping right by the overflow hose. So I'm off to the Depot for another U but this time it will be steel.

PanelDeland · 08-31-2009, 06:47 PM

Just loop hose back to the other outlet..You wont have to worry about 2 extra connections and the hose is usually flexible enough to make the bend.

texanidiot25 · 08-31-2009, 07:30 PM

Cheap beer, good overflow bottle

08-31-2009, 05:06 PM	#1
1-PU70 Registered User Join Date: Apr 2000 Location: Bradenton, FL Posts: 1,036	Radiator Is now puking I have a 70 C10 with a 402 and a 4 core radiator. Its been blowing hot air through the AC outlets so for a quick fix I disconnected the heater core. Just cut the hoses and made a u out of PVC to reconnect the hoses to instead of just plugging the hoses. Now every time I shut it off it pukes coolant out the overflow line. There is no overflow bottle never was one. It drains the coolant to the bottom of the radiator. Why would it start just by disconnecting the heater core? I did replace the cape but no change. __________________ 1970 CST/10 402,700R4,3:73 posi,AC,PS,PB,TLT,PW,Buckets with heaters

08-31-2009, 05:19 PM	#2
grancuda Registered User Join Date: Nov 2007 Location: Central OK Posts: 396	Re: Radiator Is now puking Mine pukes it out to a certain level then stops, about 1" below the radiator cap. Possibly you filled it but it had been staying at a lower level?

08-31-2009, 05:25 PM	#3
68gmsee Active Member Join Date: Jul 2007 Location: Centrally located between Houston, Austin and Waco. BCS area. Posts: 7,947	Re: Radiator Is now puking Your heater core and hoses were acting as a reservoir and heat exchanger. Now the extra heat is creating pressure causing your problem. Is your truck overheating at all? If not, do a search on overflow tank and see what others have done. I made one out of black piping I got at Lowes. Cost was about 10 dollars or so. There are other more expensive ones you can purchase.

08-31-2009, 05:33 PM	#5
1-PU70 Registered User Join Date: Apr 2000 Location: Bradenton, FL Posts: 1,036	Re: Radiator Is now puking I was going to try the overflow bottle but after a couple of drives it just about drains the entire radiator. The truck runs about 185 so it not overheating. __________________ 1970 CST/10 402,700R4,3:73 posi,AC,PS,PB,TLT,PW,Buckets with heaters

08-31-2009, 06:40 PM	#7
1-PU70 Registered User Join Date: Apr 2000 Location: Bradenton, FL Posts: 1,036	Re: Radiator Is now puking Well I just went out and added an overflow tank. Had one from my Jeep. I started her up and let it run for a while. For some reason I was checking the U I made from PVC and its cracked. The coolant is funning down the inner fender and dripping right by the overflow hose. So I'm off to the Depot for another U but this time it will be steel. __________________ 1970 CST/10 402,700R4,3:73 posi,AC,PS,PB,TLT,PW,Buckets with heaters

08-31-2009, 06:47 PM	#8
PanelDeland I am a Referee of life. Join Date: Jun 2000 Location: Greensboro N.C. Posts: 13,993	Re: Radiator Is now puking Just loop hose back to the other outlet..You wont have to worry about 2 extra connections and the hose is usually flexible enough to make the bend. __________________ The 47-present Chevrolet and GMC Truck Message Board Network,it's owners,moderators,members,and associates of any type should not be held responsible for my opinion. You can't fix stupid,not even with duct tape. "My appearance is due to the fact that "GOD" does punish you for having too much fun!" Barrett-Jackson has perfected alchemy,they make rust into gold! "You can lead a horse to water but you can't saddle a duck" "Cleverly disguised as a 'Responsible Adult' "Sometimes your Knight in shining armor is just a retard in tinfoil"

08-31-2009, 07:30 PM	#9
texanidiot25 Eat My Rust Join Date: Jan 2007 Location: Cypress, Texas Posts: 3,362	Re: Radiator Is now puking Cheap beer, good overflow bottle



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