Upper Radiator Hose Collapses When Car Cooles Down - Mazda MX-6 Forum
 
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post #1 of 11 (permalink) Old 7-25-05, 18:09 Thread Starter
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Upper Radiator Hose Collapses When Car Cools Down

As the title says when my car cools down the radiator hose suctions shut (collapses). However when the car warms up the hose flexes open under pressure and operates fine. I was wondering if this is a common indicator that the hose is failing or if this means that there is a more serious problem.

Thanks for any help guys

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Last edited by JDF; 7-25-05 at 23:10.
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post #2 of 11 (permalink) Old 7-25-05, 18:14
 
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Hmmm, can't say I've heard of that before. Is there any temperature problems while driving, or idling at a light?

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post #3 of 11 (permalink) Old 7-25-05, 18:50 Thread Starter
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Sometimes on hot days when the car is at a light the temperature will raise from about 55% to 65% according to the needle, however the fan kicks in and the temp falls right away.

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post #4 of 11 (permalink) Old 7-25-05, 19:20
 
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I have a similar problem with my upper rad hose. I changed it but the same thing happens.

No problems to report though...
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post #5 of 11 (permalink) Old 7-25-05, 19:28
 
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ur radiator cap might need to be replaced. it's supposed to have a vacuum valve in it that opens when the temp drops and suck coolant from the overflow tank. if it doesn't open the coolant will contract and pull a vacuum, causing the hose to collapse.

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post #6 of 11 (permalink) Old 7-25-05, 21:29
 
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^^^

Like he said, you're loosing a lot of coolant somewhere, and it's creating a vaccum in your system.

Are you not overheating?!

Look for puddles of coolant under your car. Then look at the cap. The dealer here wanted 20bux CDN for the cap.

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post #7 of 11 (permalink) Old 7-25-05, 23:09 Thread Starter
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I'm very certain I'm not losing any coolant as there are no puddles and my reservoir tank is overfilled. This is due to me adding coolant when I first noticed the hose was suctioning closed. I have replaced the upper radiator cap where the upper rad hose connects on the passenger side of the engine. I have not replaced the drivers side radiator cap. So I'm still not yet sure what the problem is and no my car is not overheating. As soon as the car starts to warm up the coolant hose expands under pressure and everything works fine. I'm mainly concerned since I feel the hose will eventually fail under these circumstances.

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post #8 of 11 (permalink) Old 7-25-05, 23:28
 
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the hose collapsing means that the hose is fucked.. ur hoses should always be a little stiff but as soon as the hose starts to weaken over time and use, the temperature at which the coolant boils will start to lower slightly..

so... replace ur hose

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post #9 of 11 (permalink) Old 7-26-05, 15:40
 
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i'd say it isn't the hose. when learning about chryslers nvld evap system, i was shown a picture of a fuel tanker that was being steam cleaned and the guy sealed it when he got out. when the air inside cooled it made the whole tank collapse and that's a big ass thick metal tank. if that could happen to a metal tank a hose is nothing.

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post #10 of 11 (permalink) Old 7-26-05, 15:44
 
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Quote:
Originally Posted by dsr30
ur radiator cap might need to be replaced. it's supposed to have a vacuum valve in it that opens when the temp drops and suck coolant from the overflow tank. if it doesn't open the coolant will contract and pull a vacuum, causing the hose to collapse.
this is the exact problem. replace the cap or caps, have them tested first. also a good idea to check your hoses while you are at it.
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post #11 of 11 (permalink) Old 7-27-05, 2:05
 
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Replace the car on the drivers side plastic tank, not the one on the motor. The one on the drivers side controls flow to and from the overflow, it obviously isnt allowing coolant to be sucked back out of the overflow when the engine cools.

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