heater core and no heat

From : joseph myers

Q: probably when they put the shell back together they got the air door jammed. find a picture of the heater-a/c assembly and youll see it is easy to do. last spring i had my a/c core replaced and that is what happend. all cool and no heat because the air door was jammed. joe on tue 16 dec 2003 100922 -0800 barry micockiner cuervojoseremove@jps.net wrote 97 ram 318 4x4 auto had a pressure test performed by an oil change shop......said they smelled coolant even no leak was present. next day coolant leaking from under dash. oil change company agrees to pay half of replacement costs for new heater core to be installed. core replaced now no heat or lets just say lukewarm oh yea had thermostat replaced. water lines to heater are hot top radiator hose is hot temp gauge reads normal radiator cold water pump is less tan 6 months old. shop now says could be a flow problem in the radiator. any ideas why would changing out the heater core cause flow problems by the way this is the 4th radiator in the truck all replaced previously by our friends at chrysler. thanks .

Replies:

From : john kunkel

97 ram 318 4x4 auto had a pressure test performed by an oil change shop......said they smelled coolant even no leak was present. next day coolant leaking from under dash. oil change company agrees to pay half of replacement costs for new heater core to be installed. core replaced now no heat or lets just say lukewarm oh yea had thermostat replaced. water lines to heater are hot top radiator hose is hot temp gauge reads normal radiator cold water pump is less tan 6 months old. shop now says could be a flow problem in the radiator. any ideas why would changing out the heater core cause flow problems by the way this is the 4th radiator in the truck all replaced previously by our friends at chrysler. a flow problem at the radiator wouldnt show up at the heater since the heater flow bypasses the radiator. the problem could be the adjustment of the blend door cable after the heater core was changed. this cable actuates a door that controls the flow of air through the heater core. john .

From : cdevener

ram 2500 diesel same problem i had a coolant leak in cab. i replaced the heater core with an aftermarket core. luke warm heat took it back then went to dodge dealer and got an oem core. installed in truck good heat. comparing the two cores the afermarket core was alot corser not as many cores or fins less heat transfer less heat. hope this helps clay. .