95 Mercury Sable Heater line adaptors
 

ok, so while doing a quick inspection on why the heat inside the car was weakening, i looked underneath the hood and saw antifreeze splashed up on the air filter housing and the air hose itself. recently, i did some extensive cleaning on the heater core lines and heater core itself as well and had good heat coming out, but after seeing the splashing, i knew the line protruding from the engine block was the culprit.

my question is, since this nipple (that was severely rusted away and rotted out) i took out simply slid right out of the hole; do the nipple adaptors screw into the holes or do they need to be welded into place? i measured what was left of the old line to be roughly 11/16 of an inch, but the new ones i bought and tried:

5/8 was too small in the hole
1/2 and 3/4 was too big

i need some help figuring this out.

I would suggest you to take help from a good technician.he will be the right person to help you out.

what about pressure fittings.flare out the ends of the hose you have and make it work.

Do the nipple adaptors screw into the holes or do they need to be welded into place? i measured what was left of the old line to be roughly 11/16 of an inch, but the new ones i bought and tried..