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K
Installed new hoses yesterday. Everything was fine. No leaks, brought up to temp., done. What can go wrong with changing hoses I thought. Opened the hood today to tinker and noticed the upper hose was as flat as pancake except for wher it connects to the rad & intake manifold. Started her up, once thermostat opened, hose expanded to normal. Let her cool off, flat again. What gives? Defected hose or a more serious issue? Thanks in advance to those who can give me a solution.
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Send PMFrederick, MD - USA
Joined: 9/8/2003
Posts: 3398
Vette(s): 1969 convertible L71 427/435 4-speed black interior
Usually it's the lower hose that will do that if the reinforcing spring is missing. Normally the upper hose doesn't come with a spring. Get a replacement hose...that one is defective.
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Send PMMoses Lake, WA - USA
Joined: 4/16/2005
Posts: 2134
Vette(s): 1976 L48 4-spd, Mahogany Metalic exterior, Buckskin interior 350ci/350hp, 3rd owner, fiberglass spring, 255/50-16's Torq-Thrust II
Mine did the same thing. I replaced it with one from DeWitt when I bought his radiator. I think the inexpensive radiator hoses are thinner with less reinforcing. You might want to check your cap and pick-up tube in the coolant bottle first to make sure there is no restriction.
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G
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Send PMJoined: 9/8/2005
Posts: 241
Vette(s): 1980 with a Banks Twin Turbo
1969 Convert Big Block
1996 Grand Sport Convert
Sounds to me that the System is going into a Vacume. Everything was fine when You ran it and then when it cooled off the Hose colasped cause its under a Vacume. I'd look at the Radiator Cap. Hey, at Least You know You don't have any Leaks!
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V
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Send PMMounds View, MN - USA
Joined: 5/24/2007
Posts: 1034
Vette(s): 70 LT1 coupe, 69 350 HP coupe, 69 390HP 427 coupe, 71 LS5 convert, 85 coupe, 93 coupe
As your coolant is heating up, it blows the extra into the overflow tank. As it cools down, it sucks that extra back into the engine. That is controlled by the radiator cap. If the hose is original quality, maybe the radiator cap is sticking, or the return line is plugged. But most likely the two opinions above are correct. It is just a cheap hose.
Larry
Larry
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e
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Send PMLanoka Harbor, NJ - USA
Joined: 12/21/2006
Posts: 2191
Vette(s): 1975 metallic blue coupe with t-tops,L48, t/t steering, black leather interior. 1990 L98, white/red leather interior, auto,a/c
it most likely is the hose going from the radiator to to overflow is bad. had this problem withna car i had and as soon as i replaced the hose it was fine. hope this helps.
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w
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Send PMMundelein, IL - USA
Joined: 6/9/2008
Posts: 411
Vette(s): 1978 25 anniversary blue on blue with T-tops.
I would have to agree with the rest, Cheap hose. I just replaced my water pump 2 weeks ago and replaced the top hose, themostat and radiator cap, But my hose when running stays inflated and even after cut off stays with pressure till it cools down but does not go flat. The cheapest fix is bad new hose if that dont work I would go to the overflow hose, and make sure your lower hose does in fact have a sping. the stuff they are selling at the auto parts round me were totally incorrect So you have to be prudent and ensure you are getting the right part! williammoore2 2008-10-05 06:45:06
Lifetime Member #150
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K
Thanks for the info. It was the rad cap. Sometimes is easy to forget to check the simple things and assume its something major.
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in Forum: C3 HVAC, Fuel, Emissions, and Exhaust
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