ether way should be fine.
just make sure your protected for your weather climate in the winter

20-30 degrees below zero

Whats going on guys. Well okay I did unhook my
top hose that goes to the heater core. I pored antifreeze down it and
blew it out it came out fine. So that tells me the Heater core is not
plugged or stopped up. I was wondering if you guys have any more ideas
on what it could be. I was just going to try to fix it myself before I
took it to my mechanic and save a few bucks. Thanks again guys. My fiance did tell me that when she now stops at a red light the air gets cool again. So it only stays warm when you give it gas.