under the dash right hand side.
I would suggest replacing it.
Usually at the firewall either passenger side or middle follow the heater hoses
The water pump pushes the coolant through the engine block and head(s) then into the heater core.
The heater core is located on the firewall, in the middle of the car. Exactly behind and below where the heater/a.c. switch and the radio are located. To access it you must remove the the right and left under dash panels, remove the heater floor outlet duct and then remove the screws that secure the heater core cover and remove cover. There are also retaining straps holding the heater core in place.
The heater core is located in the middle of the dash behind the center console. You have to take the console out to see the heater core.
its located on the heater core
Probably in the 1997 Pontiac trans-am heater core valve holder. If not, you probably lost it. Both the valve, and your mind.
Where is the heater core for a 2002 pontiac montana
Up and under the dash /center console.
Most are up underneath the dashboard. Turn on the heater blower motor and listen where the sound is coming from. The heater core is behind that sound.
How to change a heater core on a 1997 Pontiac grand am
where is the heater core at