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Turbo lower rad hose falls off radiator

 
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Old 02 Jan 2016, 09:38 pm
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Default Turbo lower rad hose falls off radiator

04 Turbo

Any clue why my lower rad hose keeps blowing off from the radiator?
Stock replacement hose looks fine inside and out. Stock clamp that has a tight fit.

How to make that hose stay on?
I do NOT want to use a worm screw drive clamp on this plastic rad.
I notice that the non-original rad does not have much of a flared out lip for the clamp to snug up against.

I keep a close eye on the temp gauge. I shudder at the thought of this hose falling off at freeway speeds.
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Old 03 Jan 2016, 12:24 am
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Default Re: Turbo lower rad hose falls off radiator

First, make sure your OEM spring clamp has enough tension and wasn't bent out of shape some time in the past. And make sure you are pushing the new hose all the way up on the radiator outlet.

Next, assure the radiator cap is venting as it should. If it doesn't vent out at all, you can build up a lot of pressure even when the engine is at normal operating temperature.

And third, check the strut mounts. If the strut mounts are badly worn, the engine may be able to rotate too far under load and thus pulls tight on the lower hoses. I have an idea that this might be why the turbo PT's sometimes blow the lower return line for the power steering.

Hopefully,others will come up with some additional ideas for you too.
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Old 03 Jan 2016, 07:44 am
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Default Re: Turbo lower rad hose falls off radiator

Thank you Handy, those are all very good suggestions. It could be anyone of those. I never thought about an engine or chassis that is moving around too much. But my suspicions are the rad cap. I will systematically go through this on my next day off work.
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Old 29 May 2016, 11:32 pm
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Default Re: Turbo lower rad hose falls off radiator

FYI, I figured out why the lower hose kept falling off.

It was what I first thought, too much pressure in the cooling system.

FYI2, I originally put this thread in the general turbo discussion because I was not sure at the time if too much boost could cause the rad hose to blow off.
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Old 30 May 2016, 10:53 am
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Default Re: Turbo lower rad hose falls off radiator

Quote:
Originally Posted by 044400 View Post
FYI, I figured out why the lower hose kept falling off.

It was what I first thought, too much pressure in the cooling system.

FYI2, I originally put this thread in the general turbo discussion because I was not sure at the time if too much boost could cause the rad hose to blow off.
While I read one response and your conclusion I would like to know how you thought this.

During racing (drag racing track) I run a 20PSI cap. It does not push the hoses off. If the pressure is so high in the cooling system of a stock PT and you are blowing the hoses off you my friend have a problem!!!
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Old 30 May 2016, 11:56 am
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Default Re: Turbo lower rad hose falls off radiator

What was done to keep the lower radiator hose from blowing off?

Was a hot/cold coolant pressure test done to verify excessive coolant pressure?
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Old 30 May 2016, 03:04 pm
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Default Re: Turbo lower rad hose falls off radiator

After more testing, I determined the car had a slowly failing head gasket. Indeed a problem!

Looking back, I think the bottom radiator hose inlet is purposely not barbed for just this very reason. Too much cooling pressure can be detrimental. Maybe a built in safety feature?

Yet every other vehicle I've owned has a barbed rad hose inlet...hmmm
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Old 30 May 2016, 03:32 pm
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Default Re: Turbo lower rad hose falls off radiator

e: Turbo lower rad hose falls off radiator

Quote:
Originally Posted by 044400 View Post
After more testing, I determined the car had a slowly failing head gasket. Indeed a problem!

Looking back, I think the bottom radiator hose inlet is purposely not barbed for just this very reason. Too much cooling pressure can be detrimental. Maybe a built in safety feature?

Yet every other vehicle I've owned has a barbed rad hose inlet...hmmm
The good positioning and larger coverage with a hose clamp that can give equal clamping force are the circumference can give equal holding force comparing a barbed fitting up to perhaps at leas 30 psi?

I often will pressure test to the limits (19-30 psi) of some cooling systems with only conventional hose clams. Not all of them have barb hose tubing and do just fine.
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Old 30 May 2016, 05:51 pm
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Default Re: Turbo lower rad hose falls off radiator

Before changing the head gasket, the hoses were held on by OEM spring clamps.

Interesting that the Goodyear (Continental now) silicone EPDM/Nomex hose kit came with worm drive type hose clamps.
Goodyear Super Hi-Miler Hose Kits - Free Shipping on Orders Over $99 at Summit Racing
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Old 30 May 2016, 06:58 pm
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Default Re: Turbo lower rad hose falls off radiator

Those type of clamps have been used successfully for over 3 decades. On stock as well all types of motor sport applications including racing both professional and amateur..

There are improvements and better one more suited for the task but those original clamps still work ..."jussss fine"!

I keep literally dozens of new boxes in all sizes up to around 6 inch in my garage parts supply and use them all the time.
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