Sealing Hair with Cool Water = Brittle Hair??

[CoCoRican]

I was wondering if anyone else is experiencing this as well?

I'm natural 4a\4b*

My final rinse (the rinse with cool\cold water) makes my hair feel not as soft as when i rinse with warm water.

Am i using too cold water, am i missing a step:

I dc for 1 hr rinse, out well
then shampoo, rinse out well
vinegar rinse, rinse out well
apply moisturinzing conditioner leave in for 30 minutes or so

then comes the rinsing: my hair feels as lhcf's says "like butta" when i am rinsing the conditioner out with warm water. It still feels amazing after all the conditioner rinsed out, but, when i start the cool water (sometimes cold water) to seal my cuticles I experience brittle hard feeling hair.

my hair starts to feel not as soft and a little hard.

cool water rinse is good for my hair (when i dont seal with cool water results are breakage, shedding, dryness):

I just want to know if my hair suppose to feel this hard and not AS moisturized when I'm rinsing with cool water?

I need assistance: Anyone with info I greatly appreciate!!!