See image of the lower rad hose. The one feeds coolant to thermostat.. What is that white powder? Only middle section. Is it deteriorating? BTW, it's an original hose. No overheat of anything. Car operates normally.

 

I'd say it's near the end of its life.

usually the top one goes first

Coolant hoses last much longer than they used to.
that said, our hoses are 20-25 years old now.

It's not a question of if one will fail, but when.

When is usually at the top of a mountain pass in the middle of nowhere. Usually on the hottest day of the year while the A/C is on. Such as when you are enjoying your family vacation in August.

I replaced all my hoses. Just for preventative maintenance. I bought Gates hoses on Amazon.
the whole set cost about 100 dollars. Less than a towing bill.

I prefer to replace hoses in the comfort of my garage. Not at the top of Bad Ash Pass.

 

leave it alone, Its normal.. Unless the hose is swollen or leaking. what you see that is white, is Wax. Its normal, Google it. I Nissan Daily and this is a completely normal thing to see in the Tech World...

 

2 votes, change it, leave it alone, 50/50. , Need a tiebreaker. I did a quick search, price varies a lot. Some are pictured with sleeves. I may go with Courtesy Part, lower rad hose for $27, upper one for $19, all before shipping & tax. I feel ok now. Perhaps next summer.

Thank you!

 

JVG. is not wrong for telling you to change the hose, Regardless. You will replace the radiator in that car before you burst that hose. Feel the Hose..LoL.. If it feels as though it has soft spots replace it. What I look for mainly is at the hose ends, if they are swollen or curled over at the clamping points. We change them. Either way, if there are no leaks at this time.. Roll on...

 

You say it’s the original hose? If it were my car, I’d be replacing both hoses, thermostat, and doing a coolant flush.

 

Wipe it clean if you want. Looks fine to me. Hoses are tough, built like tires, with layers of different structural materials.

 

Just leave it......

So it can blow at the absolute worst time of its own choosing! It owes you nothing after how many decades?

I did mine years ago and it didn't look anything like that! And it won't let go in bumper to bumper traffic in the middle of Summer or Below Zero in Winter so the engine pays a horrible price either.

But keep pushing it. LOL

 

I'll check hose end and look for any bulging in any part of it.

It's 3rd oem thermostat, it's fairly new. Coolant flush 3 mos. ago. I've never have any overheating issue. I am not sure if the white powder is an indication of hose deteriorating that I should take care of it quickly.

Made-in-Japan tough and durable, I'd like to hang on to it.

220F max (regulated), 14 psi (city water@30psi), unless engine is over heat and rad cap stuck close then numbers would be much higher. Perhaps, I could test it, squeeze, stretch, twist and see how it stands.

 

I’ll be honest, I have no idea why the hose is turning white. I’ve never had a coolant hose on any of my cars for 20+ years. You’ve changed the thermostat and have done a coolant flush but you decided not to replace the hoses for whatever reason. Just replace both hoses.

 

Typically the gradual appearance of white/white-ish/powdery-like residue on a rad. hose is indicative of the very slow weeping of minerals and other components of coolant from pores in the rubber hoses.

If your coolant level remains good and if a system pressure test (if done) doesn’t reveal any issues then the integrity of the hose isn’t necessarily compromised and you should be good to go and the replacement of the hose isn’t needed.