hi i have a 94 civic with a b16 a and i have no heat, just blows cold air. I replaced and checked.
-replaced t stat
-blew out heater core(flows threw fine )
-heater valve is open
-both in and out heater core lines are hott.
-new water pump

i dont no what else to check lower rad hose is cold i was told thats the way it is. please help im at a dead end rite now. thank you

 

The picture may suggest additional heater components to troubleshoot.

[IMG]local://upfiles/25538/442733801218412B94B6657E59D2DC9D.jpg[/IMG]

 

if both heater hoses are hot , i would say you might have a stuck or broken blend / recirculation door under the dash

 

what is your temp gauge on ur dash showing example: cold, balrely above cold, in the middle,etc.

ive had a few hondas where if it was real cold out side my motor would not heat up and blow heat. so i would put a peice of cardboard in front of the radiator to block the cold. and it worked great. or it could be ur climate control under ur dash