Can you bypass the sleeper heater core?

I've got this stubborn coolant leak that I've been fixing and dealing with for about 3 years. **picture attached, blue hose**

I'll fix it and it'll be fine for months maybe a year then slowly it'll start back seeping and weeping just a bit. I just put this new hose on and three days later it's seeping a bit. -it's a bad design to me, the spot where the hose attaches to the T fitting is THREADED: so I'm clamping a hose onto threads.

Because of this I think it never really gets the seal it needs.

OK NOW TO THE QUESTION:

Can I do away with the T and just simply build a union connection to go straight through, Ditch the T fitting completely? Since I've owned this truck I've never really used the bunk heat or air. I have a tri PAC and a bunk heater

 

I called my fitting store, could you tell by looking it: what type of thread that may be? I know it's not JIC

It looks to be aftermarket when the apu was installed

 

Makes since. I need to get some hose barbs like uncleal13 said

Then it would actually have a good surface to mate with

 

Thanks, I'd rather try and keep it because I know it kind of acts as a second radiatior or sorts to help keep the water cool.

I know it's probably a "duh" moment, just didn't want to bypass it and mess up that core back there etc

 

Thanks