By removing the lower radiator hose and putting the radiator chemical flush into the radiator cap. Then putting a hose to down the radiator cap.

will that water and chemical flow through the radiator before going out the hose?

I want to flush the radiator .

 

No. Flush chemical will not circulate throughout the radiator. It will go in the cap, then drop straight down and out the lower radiator hose. The flush chemicals I've seen are supposed to go in the radiator, then run the engine to open the thermostat, then keep running so the water pump circulates the flush throughout the engine and radiator.

 

Not exactly sure what you're asking. If you're using the standard cooling system flush stuff, you drain everything by pulling the lower radiator hose, then dump in the bottle of flush chemicals and refill with distilled water. Drive for a couple of days and then flush the whole system out with a garden hose.

 

thanks. I was wondering how to get the hose Water to flow through the radiator without starting it. If that’s possible

 

Yep, definitely possible. What I do is disconnect the lower hose from the radiator and the upper hose from the thermostat housing. I also disconnect the heater hoses from the thermostat housing and the water pump. This gives you good access to flush out the radiator, block, and heater core. Don't forget to flush the crud out of the overflow bottle as well.

I use a short length of rubber washing machine hose on the end of my garden hose since the smaller diameter fits nicely inside the heater hose and makes a good seal while flushing the heater core. I flush everything in both directions. The only thing you can't flush is the larger (radiator hose) fitting on the t-stat housing since the closed thermostat is blocking it. However, the smaller heater hose fitting/nipple works great since it bypasses the thermostat.

 

It's been said, but for first timers on this stuff, let me be extremely clear - The best way to drain the coolant is by disconnecting the lower radiator hose. There is a valve (with the interesting name "petcock") that most instructions will refer to. That's all well and good if we're talking a 2018 vehicle with 30k miles on it... most of the time with an XJ the radiator is pretty old and crusty and you're asking for trouble trying to open that stupid little drain valve.
At the end of the day, it's your truck, do what you want, but if you screw around with the petcock and it breaks on you and turns your simple flush into a more complicated and expensive radiator replacement, don't say I didn't warn you.

 

I didn’t mess with it. I flushed it through the upper and lower radiator hoses and put the radiator cleaner in and just ran the jeep.

I didn’t know if I could flush the radiator without starting the jeep, that was kinda my question. I got it though, went well. Appreciate the advice guys.