not a cure)wrap some bailing wire around
upper radiator hose sucked flat
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Joined: Dec 2003
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upper radiator hose sucked flat
While checking under the hood of my 93 aerostar 3.0 I found that the upper radiotor hose had been sucked flat. I recently replaced the water pump and thermostat. Can anyone provide a possible cause or at least a direction I should be looking... the aerostar hasn't over heated yet.
Thanks
Thanks
Elder User
Joined: Dec 2002
Posts: 624
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From: Georgia
Off hand I'd say it is either of two things. First the hose is shot and needs replaced. Second is the radiator cap.
The cap allows coolant to pass out into the overflow when the coolant expands due to heat. It also is supposed to allow it to siphon back in as it cools and creates a vacuum. If the cap will not let the fluid back in then the vacuum is causing the hose to get sucked flat.
Better yet, replace both. They are pretty cheap.
The cap allows coolant to pass out into the overflow when the coolant expands due to heat. It also is supposed to allow it to siphon back in as it cools and creates a vacuum. If the cap will not let the fluid back in then the vacuum is causing the hose to get sucked flat.
Better yet, replace both. They are pretty cheap.
Posting Guru
Joined: Apr 2000
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From: PNW
Re: upper radiator hose sucked flat
I don't want to cause any alarm (or more than needed) but usually, it's the bottom hose that gets sucked flat. If the problem is not the radiator cap, it could be the pump. The bottom hose is usually on the inlet (low pressure) side of the water pump and that's why there's a spring in the hose so it keeps its shape. The top hose is under pressure and retains its shape. That's the way it usually is (from my experience).
Anyway, it appears as though your top hose is now on the low pressure side, which might suggest that you have a reverse rotation water pump installed. My understanding is that there are two types of water pumps for the 3.0 motor, standard and reverse rotation (although I have to admit I could be getting it confused with another motor). I know of other people who have gotten the wrong rotation pump from the parts store. If you have a reverse rotation pump installed, then the top hose would be colder than the bottom hose. If the top hose is really supposed to be the one on the low pressure side, it should have a spring in it to keep it from collapsing. If the hose is old, the spring could have corroded away.
Anyway, it appears as though your top hose is now on the low pressure side, which might suggest that you have a reverse rotation water pump installed. My understanding is that there are two types of water pumps for the 3.0 motor, standard and reverse rotation (although I have to admit I could be getting it confused with another motor). I know of other people who have gotten the wrong rotation pump from the parts store. If you have a reverse rotation pump installed, then the top hose would be colder than the bottom hose. If the top hose is really supposed to be the one on the low pressure side, it should have a spring in it to keep it from collapsing. If the hose is old, the spring could have corroded away.
Last edited by Mikeman; Mar 18, 2004 at 02:36 PM.
Lead Driver
Joined: Sep 2003
Posts: 7,015
Likes: 208
From: SoCal
That reverse rotation pump thing almost happened to me once. Fortunately, I had the old pump with me to check against. It was an easy mistake to make; the parts list chart indicated a particular pump, and it looked identical to mine from the outside. But looking from the back sides where I could see the internals, it was obvious that they were intended to turn in opposite directions. The parts man found the right one pretty quickly.
Freshman User
Joined: May 2004
Posts: 27
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From: connecticut
i think it means that the hose is old and needs replacement , but check your radiator cap firstmake sure it is on right and working . note :if it is easy to squish top hose together when you pinch it , it is bad and needs replacement .
Elder User
Joined: Apr 2005
Posts: 882
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From: Wichita
Since you started having this problem after you replaced the pump, I'd have to follow Mikeman's suggestion. A hose on the high side of the system should not go flat.
Why Ford would be stupid enough to produce similar pumps with opposite rotation is beyond me!!
Why Ford would be stupid enough to produce similar pumps with opposite rotation is beyond me!!
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Postmaster
Joined: Sep 2003
Posts: 4,452
Likes: 1
From: Southern California
Originally Posted by VanGo
Since you started having this problem after you replaced the pump, I'd have to follow Mikeman's suggestion. A hose on the high side of the system should not go flat.
Why Ford would be stupid enough to produce similar pumps with opposite rotation is beyond me!!
Why Ford would be stupid enough to produce similar pumps with opposite rotation is beyond me!!
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Post Fiend
Joined: Apr 2005
Posts: 5,720
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From: Washington state
who wants to ruin a vacation just for a $5 radiator cap that causes overheating with blown head gaskets and cracked heads....
and check the outflow line to overflow tank....
Murphy's First Dictum of Hot/Cold....what flows out when hot must be able to flow back when cooling...
little goober ball in bottom of overflow tank can plug up the works.
and check the outflow line to overflow tank....
Murphy's First Dictum of Hot/Cold....what flows out when hot must be able to flow back when cooling...
little goober ball in bottom of overflow tank can plug up the works.
Last edited by 96_4wdr; Jan 22, 2006 at 10:59 PM.
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