144 inch sleeper blu4 heater hose replacement

50’ box might be just enough. I used 40’ on my 84” Classic, Cab and bunk. Definitely be enough for just the bunk.The silicone are prone to cold leaks, and the silicone clamps are too hard to get tight, on a small hose. I got regular SS clamps from Lowe’s. Black Gates hose from Freightliner Dealer. It was about $60. Last set of black hose lasted about 5 yrs. Had some before that, from Napa. Red regular hose, with a blue silicone layer, and black regular on inside. They don’t have it anymore. I liked that stuff. Best of both worlds. Though the silicone hose clamps I used were hard to get tight and seal, on either regular hoses. Because they’re small hoses. It was over kill. I used all new regular SS clamps from Lowes this time. Got rid of the silicone SS clamps. Silicones hose and special clamps, are 2-4x the price. Not worth it. Black hose lasts 4+ yrs. standard clamps seal good. I leave them a little long. So a new end can be cut later for whatever reason. That’s usually where they get brittle, or if I change a waterpump or valve.

 

I wrapped mine with pipe insulation this time. Last time I used Armatex, Both available at Home Depot. Used 1” hose, over the 3/4” near the engine. No chafing that way. Leave some slack for movement of Cab/Bunk, and engine.on all ends, I tried to run some 3/4” soft copper lines, inside the frame rail, with hose on the ends only, but it was too hard. Hose all the way, as usual. Good for 4-5 yrs.

 

I’m guessing you got new silicone hose clamps. They have an inner Solid band that protects the hose from the clamp. No more cutting into hose. They can be hard to get tight, without stripping the clamp. May seep a little at first. Usually when cold, after Trucks been sitting. Just tighten them with a 5/16 socket. And re tighten them after running it a bit, while they’re warm. New Truck silicone hoses are notorious for having a “cold” leak, at the clamp, till they eventually seal up.

 

Are you sure the 3 way connection is not cracked?
I tried silicone hose replacements for our extreme cold temps. Found them over rated, the same as silicone bungee cords and continue to use Gates black hose

 

Those clamps are not intended for silicone hose. Get some high quality stainless clamps. I've never had any leaks from blue silicone hose, cold weather or otherwise. I always use quality clamps on everything.