upper hose
Race Director
Joined: Nov 2002
Posts: 12,142
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From: Taylor Michigan
Race Director
Joined: Oct 2000
Posts: 12,679
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From: Shamong, NJ
You didn't say what year your working on, so I'm guessing it's an 82, based on your Forum name???
If so, the 82 upper hose is (or was a few months ago), still available from Chevrolet. The part number for the 82 upper hose is 14016075.
If so, the 82 upper hose is (or was a few months ago), still available from Chevrolet. The part number for the 82 upper hose is 14016075.
Thread Starter
Le Mans Master
Joined: Jul 2000
Posts: 6,664
Likes: 162
From: columbia city in
I called the dealer .I can still get it $32.02 will take three or more days to get it.had not thought of the dealer .they always have to order if they can get it .The good thing is if they can get it ,,,,it fits. thanks
Race Director
Joined: May 2006
Posts: 18,729
Likes: 2,579
I thought a bad hose bursts not collapses. It sounds like you have a problem with the coolant recovery system being blocked. As the coolant cools instead of drawing fluid back into the cooling system the hose collapses.
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Thread Starter
Le Mans Master
Joined: Jul 2000
Posts: 6,664
Likes: 162
From: columbia city in
I checked the line from radiator to over flow tank all clear.The hose was bought from autozone a few years ago .I think its just weak.I would rather replace now rather than wait when it gets hot out.i ordered a gates.Thanks for all replys
Safety Car
Joined: Nov 2008
Posts: 4,368
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From: Colorado
Radiator hoses are under pressure when in function so a collapse is ?
Thread Starter
Le Mans Master
Joined: Jul 2000
Posts: 6,664
Likes: 162
From: columbia city in
I also will be replaceing the radiator cap.It may not be releasing pressure.If all that does not work I will do a radiator flush.I just got the car out of storage.could there be air in the system?Will work on it this week.thanks for the replys.
Racer
Joined: Aug 2013
Posts: 339
Likes: 54
From: Fayetteville NC
Another quick and easy test, pull your radiator cap off and start your motor and watch for flow. I'm assuming you have a 180 degree thermostat and when it opens at 180, you should see water flowing inside your radiator. if not, your thermostat is stuck in the close position.
Race Director
Joined: May 2006
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Vacuum
The hose collapses due to atmospheric pressure being greater than internal pressure. This will only occur during the cool down process when the system attempts to suck coolant back into the radiator. So either the center valve on the radiator cap is blocked or the hose going to the coolant recovery tank. The system self purges any air by forcing it out into the coolant recovery tank.
Last edited by MelWff; Mar 11, 2016 at 10:51 AM.
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,118
From: Crossville TN
The UPPER hose is the PRESSURE hose...so it can't collapse when the water pump is turning-- unless the water pump isn't pumping. 
The lower hose [suction side of pump] is the one with concern of collapsing when engine is at elevated RPM's.
The lower hose [suction side of pump] is the one with concern of collapsing when engine is at elevated RPM's.
Last edited by 7T1vette; Mar 11, 2016 at 12:00 PM.
Thread Starter
Le Mans Master
Joined: Jul 2000
Posts: 6,664
Likes: 162
From: columbia city in
well I looked at the car some more .the hose from the radiator to the coolant tank was not pluged but it was collapsing were it was held to the car .The upper hose is off and it is very soft .it is three years old and made in the usa ,but it was never molded right.a new gates is coming from rock auto.
Instructor
Joined: Jun 2015
Posts: 221
Likes: 13
From: Central Virginia
The collapse can happen when the vacuum valve on the radiator pressure cap does not draw the engine coolant back into the radiator. This happens when the engine and engine coolant cool off. Remember that engine coolant expands when its at operating pressure and retracts when cool.