There is an O-ring fitting screwed into the inlet and outlet of the cooler at the radiator that the line is slid into with a retaining clip to hold the line in the fitting. The fitting that the line clips into is screwed into the radiator which the fitting is removable (fitting has male threads), you can add a female 3/8" MPT to male hose fitting to attach to the trans cooler line if you leave the trans cooler line fitting on it.

Neal

 

https://www.princessauto.com/en/deta...rb/A-p0431643e

do you mean something like this?

i assume this would fit into the rad and then i would put a drain tube on the other end,
but i think u may be saying something else

thanks sorry to be a pain

 

not a pain,

something like this;
remove the fitting the hard line is attached to from the radiator leaving the line attached to it and put this fitting on the line fitting,

this is the fitting that is screwed into the radiator that the line is attached to; , leave the line in this fitting and remove the fitting from the radiator then screw the hose barb fitting onto this fitting and attach a section of tubing and run it to a bucket.

these are the spec's that ACDelco gives for the OEM fitting; Inlet; 3/8 QUICK CONNECT, 3/8 NPTF

according to the great internet NPT and NPTF threads will work together but are not designed to meet the NPTF standard if combined, shouldn't be an issue for flushing a trans.

as I said in a prior post the only way to know if the 3/8" fitting will work is to pull the cooler line fitting out and try it as I have never done a 2003 H2 to know for sure the fitting will work.

Neal

 

I also agree with MixManSC's method to splice into the line with a compression fitting wherever there is room,

Neal

 

Leak prevention, starts with less connections.

 

ahh great thanks that makes sense! thanks for the help, ill try everything and get back with what worked!!

 

thanks everyone for the help! and for anyome thats doing the job soon, its very simple

all i ended up doing was removing the metal clip from the upper trans cooler line and then took the line out, i had some left over pipe i dont know the size for it, i assume its some fluid one and it fit right into the hole. i didnt need to take off or install a fitting or anything. i just pushed it in and it was snug and then the other end into a bucket. i kept my finger just holding the side that went into the trans cooler just so it wouldnt come loose or something and got a helper to start and stop the truck when i saw bubbles.

super easy!!
thx

 

Thanks for updating and good to hear you got it worked out.

Neal