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Frequently Asked Questions


The only stupid question is the one unasked!
We've compiled the most common
questions about Cool-Flex here.
 

 
Can't find your answer?
Click here to send us your question.



Q:

Why is Cool-Flex worth the price?


A:

Cool-Flex is better in every way. Look here:
Cool-Flex vs. competitors
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Q:

What are the dimensions of the end covers and rubber couplings?

A:

There is an accurate chart describing the measurements of the end covers in our Tech Info section. Click here to go there.
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Q:

Which direction does the end-cover go on?


A:

The billet hose end covers are designed to have the tapered end with the Cool-Flex logo going towards the Cool-Flex hose. This installation is designed for two reasons:
#1 If using a radiator such as a Walker the outlet neck on the top of the radiator is very short and if installed backwards the hose may blow off the radiator due to lack of engagement.
#2 When properly installed the machined aluminum cover conceals the rubber coupling, giving you a great final finish.
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Q:

How long will this hose last? What about the rubber parts?

A:

Cool-Flex comes with a LIFETIME guarantee. Since we use the highest quality yarn-woven rubber available, even the rubber couplers and reducers are guaranteed.
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Q:

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A:

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Q:

What does the end cover do? I mean it's a tight fit in there, will I screw it up if I cut part of the end cover away to make it fit?

A:

The billet cover has no function in the operation of your Cool-Flex except as a decorative finish - it's the final touch in dressing up your car. The cover may be trimmed and adjusted to make sure it doesn't interfere with any accessory attachments on your engine or radiator.
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Q:

Can I do without the end cover?


A:

There is no need to purchase the end cover unless you dislike the looks of the rubber hose and the stainless hose clamps. In some applications Cool-Flex looks great without the covers.
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Q:

Would it be OK to leave the old rubber hose on the bottom of the radiator? Nobody can see it down there.

A:

Many customers choose to replace only the upper hose on their cars. The lower hose is not as visible as the upper, but while you're in there working we suggest that you give that lower hose a squeeze and if it is soft REPLACE IT, even if you don't use Cool-Flex. When you are draining the fluid to change your hoses we also have 40BELOW to help control engine temperature.
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Q:

I'm Captain America and I drive a white Mustang. My colors are red, white and blue, so is it OK to put a red end cover on a blue hose? How about the other way around?

A:

It's great to mix and match colors to coordinate with your engine compartment and your paint job. Just select the hose kit without the billet ends, then choose the end-covers of your choice.
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Q:

Why is Cool-Flex more expensive to make?


A:

Cool flex radiator and heater hoses are the world's most expensive to make because they are the highest quality hoses you can get. The copper tubing (it's 99% copper 1% tin) is manufactured in England. It is seamless. Then it is shipped to the USA so American craftsmen can corrugate it to our specs. It is then 100% inspected for imperfections and flaws. After the corrugation process the tubing is one-third of its original length. After inspection, the Cool-Flex is cut to 12-inch, 24-inch and 36-inch lengths. Then it's carefully packed in special boxes, with the correct separation between each length of hose, so it can be shipped to a chrome shop setup especially to plate Cool-Flex to exacting standards. The plating has to be correctly done so the product can bend and flex with no effect on the plating. After careful racking and plating and then inspection and packaging, the Cool-Flex is delivered to our facility and carefully packaged for you our customer. It just ain't a piece of molded rubber hose! We are so confident in the quality of Cool-Flex, that if the hose ever leaks or breaks, that is in "for-ever," we will give you another one at no cost at all.
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Q:

I moved the Cool-Flex from my old rod to the new car. I had to straighten it and rebend it, and it felt stiff. Could the metal be work-hardened? Is there any risk it will crack?

A:

Cool-flex hose is designed for high vibration and a multitude of rebends. Like any piece of metal, bend it often enough and fast enough, and it finally will fatigue. But remember, you own Cool-Flex, not some cheap imitation, and Cool-Flex comes with a lifetime guarantee. So as long as we have your warranty card on file (please remember to send it in), if the hose ever leaks or breaks you get a new one free.
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Q:

I whacked my Cool-Flex with a wrench and there's a chip in the color. Can I touch it up? Did I create a pinhole where it could blow?

A:

Cool-Flex can be touched up with any nail polish that matches your color. If you chip the chrome, a dab of silver paint will work. It's just about impossible to create a pin-hole but if you somehow manage to do that, no problem, because you have a lifetime warranty. Just send it back.
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Q:

Is there any way to install my Cool-Flex without draining the radiator?

A:

Geez, wouldn't that be nice! To date we have not found a way to change your hose without lowering the fluid in your radiator. When we find it you'll be the first to know.
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Q:

When I cut my Cool-Flex to length, should I be using a special hacksaw blade? What do you recommend?


A:

We recommend, when cutting your hose, to use a fine-tooth hack saw or if you own a Dremel abrasive cutoff wheel it will work just fine. Cool-Flex is easy to cut, the hardest thing is holding it so as not to damage the finish. There's no need to do any extra work after cutting unless you wish to clean up the burrs. Oh, by the way, don't be concerned if you cut it on an angle, it's no problem and it will not leak.
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Q:

There's a little tube of glue in my Cool-Flex kit. What's that for?

A:

Yes, we supply a tube of gel glue with each kit. The reason for the glue is that the inside of the large hose connector is sometimes coated with a release agent that can be very slippery. The inside should be cleaned and the parting agent removed. When installing the reducer into the 1-3/4 coupling, the glue attaches it to avoid slipping.
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Q:

Do I have to cut the Cool-Flex, or is a curvy path OK? I mean is there any advantage to making the fit as short and tight as possible? Does it make any difference in how the fluid transfers if my Cool-Flex bends upward, downward or sideways?


A:

Forming and fitting your hose is easy and the direction of the hose going up or down doesn't matter. Remember after filling your system with coolant you should run the engine to operating temperature then let it cool down and retighten the clamps, and then check the fluid level. Most times you will have to add fluid. The length of your Cool-Flex is entirely up to you. Many rod builders prefer to use all of the hose and elect not to cut it. This is OK to do and will not affect its performance. However, remember if your hose is hanging without support the weight of the hose plus fluid might cause the hose to pull off its connection.
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Q:

I live in the Alaska where we have to use a block heater to keep the engine oil liquid overnight. Will this affect my Cool-Flex installation?

A:

COOL-FLEX will work in all climate conditions, whether you're in a cold climate or a hot climate. Engine temperature up or down is never affected.
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Q:

I measured the old radiator hose like you said and sawed the Cool-Flex to match, but it doesn't really fit, it's a couple of inches too long. What did I do wrong? Should I cut it shorter, or bend it more, or what?


A:

Rubber hose fits OVER the water necks, but Cool-Flex fits BETWEEN them. The reinforced rubber coupling then fits over both the Cool-Flex and the water neck. Cut the Cool-Flex 2 inches shorter, or else bend it some more. Works fine either way.
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Q:

I measured the old hose and subtracted 2 inches for the fittings. Now the Cool-Flex is maybe half-an-inch short. Will the rubber sleeve bridge the gap? Can I stretch the hose? How would you recommend I do this? How much stretching is too much?

A:

The rubber coupling should bridge the gap. We don't think you are strong enough to stretch the Cool-Flex.
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Q:

How close of a fit do I want anyway? Is it OK if the coolflex touches the metal at both ends, or should there be some kind of expansion gap in there? How much of a gap? How do I keep the hose centered between the rad and the water pump, so there's an even gap at both ends? Do you think I might be worrying too much?

A:

Yes you are worrying too much. So long as one of the stainless steel hose clamps bears tightly on the Cool-Flex, and the other grabs the water neck, you won't have any problems. Go worry about global warming or something serious.
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Q:

I've got a big-block Chevy that has a bypass hose. Do you have a Cool-Flex piece to replace it?


A:

You bet. Click here to go to the page.
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Q:

Is there any problem with putting cool flex on my Harley?

A:

Currently, Cool-Flex is not available for Harley Davidson applications. If however, you have a motorcycle application with a V-8 engine (Boss Hoss) the hose kit will work. The kit to use would be our standard 12" kit.
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Q:

I love the Cool-Flex so much I am going to put it under the hood of my Honda Civic. Any reason why not?

A:

No reason why not. Our import kit fits most foreign cars, including your Honda.
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Q:

This is an extreme hot rod and there is a couple of feet between the rad and the water pump. I mean it is really far out there. Can you supply Cool-Flex in an extra-long custom length?

A:

You bet we can. Call us to discuss what you need. 1-203-265-3617
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Q:

Is it going to be cheaper if I buy a Cool-Flex kit, or if I just buy the parts I actually need? Is there extra stuff in the kit? I don't wanta pay for any extra stuff.


A:

It is most economical to purchase Cool-Flex in a kit, that's why we stock all lengths and colors, including end caps, in kit form. The kit makes sure that in a typical installation, you'll probably have all the connectors and reducers you'll need. Yes, you will have extra parts when you have completed your installation but with the variation of OEM parts it's better to have more than not enough. if you have a special situation i.e. inline thermostat or special heater controls, you will have to purchase small parts separately to complete the job. Click here to make a kit
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Cool-Flex

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