Just want to make sure, The outlet house is the bottom one on the core ?
want to make sure i start out blowing it back out not sticking it in further
thanks in advance

 

You really shouldn't have any problems with mixing them up since they are both different sizes. One is a 3/8" and the other is 5/8". Off the top of my head I don't remember which is which.

 

One is 3/4" and the other is 5/8". (must still be on the pain pills....ha, ha) 3/4" is the core inlet and 5/8" is the outlet.

 

thanks my project after seattle beats the san fran

 

Yep, bigger tube is inlet, smaller tube is the return. So you start flushing through the smaller

 

DAMN! I can't believe I put 3/8. Good thing you are catching these. LOL
It's been a rough week. LOL

 

We understand Rob, you're usually pretty sharp....must indeed be the pills
I can recall one of the OEM hoses had some weird something/16 on it....which I could not find anywhere here...

 

OE factory top hose was 11/16". Jeep bean counter probably came up with that.

 

11/16", that was it!
Nowhere to be found here...ended up with the other mentioned size which worked fine...

 

Nobody locally carries 11/16" hose......they all carry 12/16" and 10/16" hose. LOL

 

ofcourse....lol

 

OK, just saw this thread while looking for heater core hose answers. I have the same question and I am still confused because the question started with "the one on top or the one below" and the answer went to 3/8th and 5/8th and 11/16th and smaller one vs bigger one, etc. So, OK, in my 1999 it has two hoses going to the core, one on top and one bellow. Is the top one the outlet?

I am new to wrenching so I need it in crayon and dont try to use all 8 colors of the box! Going to flush radiator and heater core.

 

so to back flush you the 5/8 fitting. Correct?

 

The hose that connects to the thermostat housing at the upper front of the engine is the inlet hose to the heater core. That same hose connects to the thermostat housing right next to the upper radiator hose.

Regardless, flush the heater core in both directions.