Upper rad hose ? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

scotts72heavyhalf · 04-22-2008, 02:32 AM

I just noticed when I was washing my engine compartment off that my upper radiator hose was flat, no cooling problems, tank full, overflow full, when I took the cap off the hose retook its previous form, a bit flatter. I noticed that alot of our trucks had a solid almost pipe in place of a hose, can I find one of thodse or does anyone have a suggestion for a solution?

Thanks

Longhorn Man · 04-22-2008, 02:56 AM

the pipe is supposed to be on 4X4 trucks, the 2 wheel drives never had them *as original*.
This really isn't an issue. once you fire it up and it builds pressure, it'll inflate. If it bugs you, then I guess a new hose would be the answer.

scotts72heavyhalf · 04-22-2008, 03:01 AM

Well there you have it, doesent bug me with the hood closed, I`ll just keep it that way.

Thanks

1tigers · 04-22-2008, 03:46 AM

you can put a wire coil inside to keep it round.

**Green Machine** · 04-22-2008, 03:55 AM

Your radiator cap is not working right or is not vented. There should be a little round valve in the center of the cap that will let air back into the system when it cools down, preventing the vacumn that sucks the hose shut.

68gmsee · 04-22-2008, 03:59 AM

I wouldn't just forget about it, though... If it flattens out too much, it may be time to replace it. There's a lot of pressure in a hot radiator for a weak hose and could leave you stranded.

I've never noticed it on either of my trucks but I have replaced the hoses a couple of time since I had them.

scotts72heavyhalf · 04-22-2008, 06:24 AM

I`ll change out the cap and hose tomorrow, I was just kidding about not lifting the hood.

Thanks all, great info

Longhorn Man · 04-22-2008, 06:28 AM

if it has the original style cap, it'll let pressure out, but not back in.
The spring is a band aid fix. It is intended for the lower hose where it is under a partial vacume condition when ever the engine is running.
I've seen this before, and it bothered me on one of my trucks, but being lazy and cheap, i let it go for about 3 years with no issues. I was advised that it was normal back in the day.

04-22-2008, 02:32 AM	#1
scotts72heavyhalf Registered User Join Date: Aug 2007 Location: Sandy, Oregon Posts: 1,551	Upper rad hose ? I just noticed when I was washing my engine compartment off that my upper radiator hose was flat, no cooling problems, tank full, overflow full, when I took the cap off the hose retook its previous form, a bit flatter. I noticed that alot of our trucks had a solid almost pipe in place of a hose, can I find one of thodse or does anyone have a suggestion for a solution? Thanks __________________ Scotts72C10

04-22-2008, 02:56 AM	#2
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: Upper rad hose ? the pipe is supposed to be on 4X4 trucks, the 2 wheel drives never had them as original. This really isn't an issue. once you fire it up and it builds pressure, it'll inflate. If it bugs you, then I guess a new hose would be the answer.

04-22-2008, 03:01 AM	#3
scotts72heavyhalf Registered User Join Date: Aug 2007 Location: Sandy, Oregon Posts: 1,551	Re: Upper rad hose ? Well there you have it, doesent bug me with the hood closed, I`ll just keep it that way. Thanks __________________ Scotts72C10

04-22-2008, 03:46 AM	#4
1tigers Registered User Join Date: Apr 2008 Location: auburn,al. Posts: 32	Re: Upper rad hose ? you can put a wire coil inside to keep it round.

04-22-2008, 03:55 AM	#5
Green Machine Senior Member Join Date: Jul 2004 Location: Estherville, Iowa Posts: 3,371	Re: Upper rad hose ? Your radiator cap is not working right or is not vented. There should be a little round valve in the center of the cap that will let air back into the system when it cools down, preventing the vacumn that sucks the hose shut. __________________ 1968 C10 307 3spd Long Fleet ------ http://67-72chevytrucks.com/vboard/s...d.php?t=201103 1970 C10 305 Super T10 Long Fleet --- http://67-72chevytrucks.com/vboard/s...d.php?t=202285 1971 C20 383 TH350 Dana Posi ----- http://67-72chevytrucks.com/vboard/s...d.php?t=206894 2001 GMC Sierra 1500 C3 6.0

04-22-2008, 03:59 AM	#6
68gmsee Active Member Join Date: Jul 2007 Location: Centrally located between Houston, Austin and Waco. BCS area. Posts: 7,947	Re: Upper rad hose ? I wouldn't just forget about it, though... If it flattens out too much, it may be time to replace it. There's a lot of pressure in a hot radiator for a weak hose and could leave you stranded. I've never noticed it on either of my trucks but I have replaced the hoses a couple of time since I had them.

04-22-2008, 06:24 AM	#7
scotts72heavyhalf Registered User Join Date: Aug 2007 Location: Sandy, Oregon Posts: 1,551	Re: Upper rad hose ? I`ll change out the cap and hose tomorrow, I was just kidding about not lifting the hood. Thanks all, great info __________________ Scotts72C10

04-22-2008, 06:28 AM	#8
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: Upper rad hose ? if it has the original style cap, it'll let pressure out, but not back in. The spring is a band aid fix. It is intended for the lower hose where it is under a partial vacume condition when ever the engine is running. I've seen this before, and it bothered me on one of my trucks, but being lazy and cheap, i let it go for about 3 years with no issues. I was advised that it was normal back in the day.



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