Top Hose collapses
Thread Starter
Drifting
Joined: Jul 2007
Posts: 1,889
Likes: 23
From: Kansas
Top Hose collapses
C-5 1999. When you start it up the Top hose goes flat. By opening the surge tank cap you can hear hissing of air & the hose opens up. Until it gets cold again, Thank's Gentleman. I Appreciate, Helping a friend. Gene from C-3 ..
Melting Slicks
Joined: Jul 2010
Posts: 2,503
Likes: 33
From: McGrady NC
St. Jude Donor '15-'16
Hey Gene! It's been a while since i was on the C3 forum. We traded parts a few times.
It sounds like time for some routine maintenance. Replace the hose and t'stat. Bleeding the air out of the system afterwards is a bear so there are specific steps to doing that. I'm sure someone else will chime in on that.
It sounds like time for some routine maintenance. Replace the hose and t'stat. Bleeding the air out of the system afterwards is a bear so there are specific steps to doing that. I'm sure someone else will chime in on that.
.
Joined: Apr 2013
Posts: 5,032
Likes: 1,156
From: Oregon
St. Jude Donor '14-'15-'16-'17-'18-'19-'20-'21-'22-'23
Yea there is a procedure for it and it does take a bit of time
https://www.corvetteforum.com/forums...nt-change.html
https://www.corvetteforum.com/forums...nt-change.html
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Seen this DOZENS of times... All that's wrong is you have a DEFECTIVE PRESSURE CAP on the coolant reservoir.
There's a NEW UP-DATED 18 lb cap and its not expensive.
Yours has a plugged relief valve . It should allow AIR IN the cap when the cooling system cools down and NOT allow pressure OUT when its HOT. If its working properly, the TOP HOSE will not collapse!!
Simple as that!
Bill
There's a NEW UP-DATED 18 lb cap and its not expensive.
Yours has a plugged relief valve . It should allow AIR IN the cap when the cooling system cools down and NOT allow pressure OUT when its HOT. If its working properly, the TOP HOSE will not collapse!!
Simple as that!
Bill
Team Owner
Joined: May 2001
Posts: 36,836
Likes: 244
From: Dear Karma, I have a list of people you missed.
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16
Seen this DOZENS of times... All that's wrong is you have a DEFECTIVE PRESSURE CAP on the coolant reservoir.
There's a NEW UP-DATED 18 lb cap and its not expensive.
Yours has a plugged relief valve . It should allow AIR IN the cap when the cooling system cools down and NOT allow pressure OUT when its HOT. If its working properly, the TOP HOSE will not collapse!!
Simple as that!
Bill
There's a NEW UP-DATED 18 lb cap and its not expensive.
Yours has a plugged relief valve . It should allow AIR IN the cap when the cooling system cools down and NOT allow pressure OUT when its HOT. If its working properly, the TOP HOSE will not collapse!!
Simple as that!
Bill
It has a bi-directional valve. 
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Instructor
Joined: Aug 2013
Posts: 118
Likes: 4
From: Vancouver BC
[QUOTE=Bill Curlee;1591821869]Seen this DOZENS of times... All that's wrong is you have a DEFECTIVE PRESSURE CAP on the coolant reservoir.
There's a NEW UP-DATED 18 lb cap and its not expensive.
Yours has a plugged relief valve . It should allow AIR IN the cap when the cooling system cools down and NOT allow pressure OUT when its HOT. If its working properly, the TOP HOSE will not collapse!!
Simple as that!
I agree. I had the same issue and a new cap did the trick
There's a NEW UP-DATED 18 lb cap and its not expensive.
Yours has a plugged relief valve . It should allow AIR IN the cap when the cooling system cools down and NOT allow pressure OUT when its HOT. If its working properly, the TOP HOSE will not collapse!!
Simple as that!
I agree. I had the same issue and a new cap did the trick
Last edited by Tru Blu; Mar 22, 2016 at 02:37 AM.