My Daughter took my camera to the beach last night and hasn't brought it back.
I will try to explain without pictures.
I went to National Tool store and found a 3/8 male to 3/8 male in pipe thread, The reason I got this one is because in the middle of the 2 sections was a nut (3/4 wrench). If you can't find the one with the nut in the middle You can use a 3/8 male to a 90 degree bend 3/8 female and a 3/8 male to 3/8 male nipple.
First I got rid of the small diameter broke pipe that the hose hooks to, A pliers will break off all the small plastic pipe down to the thicker pipe. Now you have a somewhat thick pipe to make threads inside. The hole is exactly 9/16 inch inside diameter. 3/8 pipe thread is 5/8 inch outside diameter. so you need to drill the 9/16 hole out to either 19/32 or 37/64ths. These drill bits are a little hard to find but they can be found. Go to Google and put in 19/32 drill bit, or go here. http://www.amazon.com/Quality-Speed-Steel-Shank-Drill/dp/B0007Q3GEY
Very carefully drill a straight hole, I have the advantage here, the manifold I drilled was on the floor. If you have a friend get them to shop vac while your drilling.
If you got the 3/8 pipe with a nut in the middle, just hand start the pipe in the hole and then drive it in with a socket wrench. If you couldn't find the one I have and went with a 3/8 ninety and 3/8 nipple, Put the ninety on the nipple and use the ninety as a lever to screw in the nipple. After you get the nipple screwed all the way in take the ninety off and pit some Teflon tape on the male end of the nipple that's in the manifold and screw the ninety back on, get everything good and snug, you will have to buy a short section of heater hose that fits the 3/8 male end to your heater core. Get another 3/8 male to male 90 to adapt the heater hose from your manifold to the heater core easier.
3/8 pipe nipple 3 inch long
3/8 male to 3/8 female 90
19/32 or 37/64 drill bit
3/8 male to 3/8 male 90
2 feet of heater hose to fit the 3/8 pipe male end
4 heater hose clamps
When ever she brings my camera back I will take pictures of the parts and what I did.