collapsed radiator hose - The 1947 - Present Chevrolet & GMC Truck Message Board Network

7tredmach · 12-15-2008, 01:46 PM

Hi guys, great site, and alot of good looking trucks.
I have a question for a friend who has a 72 c-10 pickup. The truck has been completely restored and rebuilt, The motor has around 1,000 miles on it. The question I have, is what would cause the top radiator hose to collapse when he cuts the truck off after driving for a while. I've heard of the bottom hose collapsing while driving, but never heard of the top collapsing after driving.
Thanks, Paul

Bruce88 · 12-15-2008, 02:26 PM

A bad or wrong radiator cap. When the engine cools down it sucks antifreeze back into the radiator thru the cap from the catch can, the valve in the cap can be bad or some times a wrong type of cap can be installed. Some older caps only allowed venting not allowing the sucking of fluid back into the system.

Rack Man · 12-15-2008, 02:26 PM

Could be several different things...My first guess would be a faulty or wrong radiator cap...but it could also be a faulty thermostat or maybe a pinched overflow hose....Upper hose may just be bad as well....

Dan

cdowns · 12-15-2008, 02:33 PM

bad cheap rad hoses do that

STOCKISH · 12-15-2008, 02:39 PM

Definately the cap.

7tredmach · 12-15-2008, 04:19 PM

Thanks for the info. He going to replace the cap first, then the upper hose if needed. What lbs. cap should he use? He replaced the stock 2 row with a 4 row radiator, and added vintage air during the rebuild. The motor is pretty much a stock 307 with 350 heads, edelbrock intake, and 600 carb. The truck is driven mostly durring warm, and hot weather, what degree therostat should he run.
Again, thanks for the info
Paul

Wrenchbender Ret · 12-15-2008, 05:36 PM

If everything is in top notch shape he can run a 13 lb. cap. A 180 therm. works best.

12-15-2008, 01:46 PM	#1
7tredmach Registered User Join Date: Dec 2008 Location: Quinton, Va. Posts: 4	collapsed radiator hose Hi guys, great site, and alot of good looking trucks. I have a question for a friend who has a 72 c-10 pickup. The truck has been completely restored and rebuilt, The motor has around 1,000 miles on it. The question I have, is what would cause the top radiator hose to collapse when he cuts the truck off after driving for a while. I've heard of the bottom hose collapsing while driving, but never heard of the top collapsing after driving. Thanks, Paul

12-15-2008, 02:26 PM	#2
Bruce88 Registered User Join Date: Oct 2008 Location: Everett, WA Posts: 326	Re: collapsed radiator hose A bad or wrong radiator cap. When the engine cools down it sucks antifreeze back into the radiator thru the cap from the catch can, the valve in the cap can be bad or some times a wrong type of cap can be installed. Some older caps only allowed venting not allowing the sucking of fluid back into the system.

12-15-2008, 02:26 PM	#3
Rack Man Registered User Join Date: Sep 2008 Location: Tempe, AZ Posts: 770	Re: collapsed radiator hose Could be several different things...My first guess would be a faulty or wrong radiator cap...but it could also be a faulty thermostat or maybe a pinched overflow hose....Upper hose may just be bad as well.... Dan __________________ My Build Thread: http://67-72chevytrucks.com/vboard/s...d.php?t=309288

12-15-2008, 02:33 PM	#4
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: collapsed radiator hose bad cheap rad hoses do that __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

12-15-2008, 02:39 PM	#5
STOCKISH Formerly- 1972SuperCheyenne Join Date: Oct 2008 Location: Wake Forest NC Posts: 5,782	Re: collapsed radiator hose Definately the cap. __________________ --Josh My Build Thread:http://67-72chevytrucks.com/vboard/s...d.php?t=799218 A good crossthread is better than Loctite any day. Life is not about what you have, but who you have to share it with.

12-15-2008, 04:19 PM	#6
7tredmach Registered User Join Date: Dec 2008 Location: Quinton, Va. Posts: 4	Re: collapsed radiator hose Thanks for the info. He going to replace the cap first, then the upper hose if needed. What lbs. cap should he use? He replaced the stock 2 row with a 4 row radiator, and added vintage air during the rebuild. The motor is pretty much a stock 307 with 350 heads, edelbrock intake, and 600 carb. The truck is driven mostly durring warm, and hot weather, what degree therostat should he run. Again, thanks for the info Paul

12-15-2008, 05:36 PM	#7
Wrenchbender Ret Registered User Join Date: Oct 2005 Location: Overland Park, Ks. Posts: 5,208	Re: collapsed radiator hose If everything is in top notch shape he can run a 13 lb. cap. A 180 therm. works best.



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