Coolant Leaks using Continental Blue Hose Kit - Chevy Impala SS Forum
 
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post #1 of 8 (permalink) Old 09-06-2017, 01:40 PM Thread Starter
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Coolant Leaks using Continental Blue Hose Kit

Hello All,

Bizarre query that I hope someone can answer.

I recently replaced all the coolant hoses with the blue ones made by Continental (made from EPDM and Nomex). I ordered the complete kit (see link below) and the special hose clamps (same type as used for Silicone hoses) from Summit Racing Equipment. Almost immediately I noticed that the upper rad hose at the thermostat housing as well as both heater hoses by the water pump would sweat a drop or two of coolant. I tightened the clamps on numerous occasions but the problem persisted. I didn't notice the issue at other connections but my attention was focused on those 3 locations.

During a recent 6K km trip (4K miles), it appeared to disappear. Two weeks ago I had just driven into town (90 km / 55 mi), when I noticed the temperature going up as we pulled into the restaurant parking lot. This was accompanied by the smell of coolant. Stepping out of the car I could see a dark trail marking our path through the parking lot. Opening the hood revealed that the lower rad hose at the radiator had come off COMPLETELY!!! Fortunately I was able to purchase fresh coolant near by and repair it on the spot (after letting the car cool down during dinner). I was fortunate it happened in the parking lot as we had just come off the highway and would be heading back out after dinner.

During the repair I noticed a few hose connections that I could easily move back and forth on the respective fitting. I thoroughly tightened each connection before driving home. I checked the connections again yesterday (car has not been driven since coming home after the incident) and noticed that I could tightened most connections at least one or two turns.

I have never experienced something like this before with OEM or Silicone hoses. Has anyone else had this experience? I'm tempted to mark the clamps on the off chance that they are loosening off due to the heat/cool cycle.

FWIW car is low mileage (100K km / 62K mi), cooling system has been flushed, fresh coolant, water pump recently replaced, 160 degree thermostat and both cooling fans function correctly. Engine temperature never goes above mid scale.

https://www.summitracing.com/int/parts/cel-5007

Thank you and take care,
PK
1996 Impala SS (102K km - for sale as of May 2018), 1994 Ford Escort, 1981 Mercedes 300SD (SOLD), 1971 VW Beetle Convertible (next project).
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post #2 of 8 (permalink) Old 09-06-2017, 05:46 PM
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I had the "Goodyear" (before Continental bought them) blue hose set and used worm drive stainless clamps with the bevel sleeves so the clamp did not cut the hose...never had your issue and I did not go ape shiat tightening....just normal "firm"

I now have stock hoses using the stock spring clamps, no issues

One reason you may have is a partially blocked radiator causing to much pressure. I did see a SS on dyno puke his upper hose where it blew right off the upper radiator connection due to a partially clogged radiator

all your hoses fit snug on their own without clamp??

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post #3 of 8 (permalink) Old 09-06-2017, 06:01 PM
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I only use OEM clamps . my 96 has the same 22 year old clamps and the upper radiator hose was the only hose replaced. high pressure can be from a bad rad cap. I had this happen the cap had some crud in it that is caused a higher pressure. I use only 15 psi caps OEM pressure ...the high pressure did cause the engine to run hotter and cause my upper hose to turn into a water balloon .. that was about 4 yrs ago .. all is good since then .

I also use dexcool with distilled water only 65% dexcool 35% distilled water..
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post #4 of 8 (permalink) Old 09-06-2017, 06:56 PM
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Slightly out of round hose barbs can produce these symptoms also. I've had good results from Gates thermal hose clamps that one applies with a heat gun.

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post #5 of 8 (permalink) Old 09-06-2017, 08:35 PM
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im guessing the old hoses were fine before and did not leak in the same area. II also had the former Goodyear Blue hoses at one point and don't remember any issues with leaks like you described.

Your link didn't work but by "special hose clamps" do you mean like these "lined" worm gear clamps?

11/16" to 1-1/16" Worm Gear Lined Clamp | U.S. Plastic Corp.

I used these when I switched out to the Green 9C1 hoses and also used some kind of Hose paste or sealer that came in a little packet at Autozone for a couple of dollars. I know it's a pain but try to pull the hoses, make doubly sure all the barbs are smooth and glean and try some of that hose stuff to see if that helps.

Always a good idea to replace the pressure cap when servicing the coolant system. But if it was fine before and the old hoses didn't leak you may just have to try and figure out why the blues leak. Maybe check with the vendor and see what they recommend. Another real qwick fix if you can live with the "look" of 2 clamps.....put another hose clamp on the hose end with the screw at 180* from the other clamp. That should seal it up good.

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post #6 of 8 (permalink) Old 09-06-2017, 11:36 PM
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Quote:
Originally Posted by 1slow96 View Post
Slightly out of round hose barbs can produce these symptoms also. I've had good results from Gates thermal hose clamps that one applies with a heat gun.
+1 on the Gates Power Grip. Especially on the heater hoses at the tee and reducer. Nice clean appearance, no sharp metal clamps, no leaks. Conforms to uneven surfaces.

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post #7 of 8 (permalink) Old 09-08-2017, 04:11 PM Thread Starter
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Hello All,

Many thanks for all the feedback.

I can't comment on the condition of the hoses prior to replacing them. My usual process when I bring a new car home is to replace all the potential road side problems; hoses, coolant (incl. flush), belts, water pump, plugs, all other fluids/filters, brakes, etc.

The rad cap is original. I did take it apart yesterday and it 'appears' OK. I will order a new one as a precaution.

Regarding the fit before clamping, it was quite snug so I didn't expect any issues.

Never heard of the hose paste or the Gates clamps. I will look into these at my local NAPA. BTW, Gates make some wonderful plastic hose adapters including reducers - been using these for years. Great stuff.

I don't drive the car much so it may be a few weeks before I can report back with an update, so bear with me.

Thank you and take care,
PK
1996 Impala SS (102K km - for sale as of May 2018), 1994 Ford Escort, 1981 Mercedes 300SD (SOLD), 1971 VW Beetle Convertible (next project).
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post #8 of 8 (permalink) Old 09-09-2017, 08:50 AM
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Just looked at the packet and it's called "radiator hose grease" and its main purpose is to help with later hose removal since the hose won't stick to the metal fittings. My thinking was this stuff may help seal a little leak like you described but the real benefit comes from a year from now when you may have to remove a hose. They'll will slide right off the fitting without issue.

But with you issue and not much history of the car, you may want to reevaluate the condition and cleanliness of the hose barbs. Make sure they are clean and smooth and reattach your hoses. No reason a solid worm gear or spring clamp should not seal the hose to the barb.

================================================== =============


'95 Caprice SS conversion - Bonny Buckets - 96 Column, Shifter and Console - 3.73 Gear and Herter tune - Z/28 Cluster - Blazer OH Console - Green/Pink bushings - Chromed Impala Wheels - Eibach Springs and Bilstein Shocks - Corvette Engine Dress - the list goes on and still more to do...it never ends.
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