Any1 use Prestone Flush and Fill kit on a 2.2L

I just bought Prestone's Flush and fill kit for flushing the coolant.

I am just wondering before I cut any hoses to install the kit there are two almost identical hoses leading from the firewall both boing to the engine of the Left (Driver side)

Any idea which one to cut???

Thanks

Cut either one. Those are the heater hoses. The one coming out of the head is best as it will "backflush" the heater core. I have used both in the past with success.