There is no water valve.
Remove the water supply hoses from your 2002 Dodge Ram 1500 heater core. Remove the heater core retaining bolts. Reverse the process to install the new heater core.
Drain the water from your Dodge Ram truck cooling system. Remove the water lines from the heater core. Remove the heater core retaining bolts. Reverse the process to install the new heater core.
pull the dash
have a professional do it
If a Dodge Ram Van is not getting any heat, the first sign of it being the fault of the heater core would be a very wet passenger side floor board. The heater core is located near the foot well on the passenger side.
The heater hoses are 5/8 inch diameter.
heater core
It is inside the HVAC housing, under the dash.
I got one at the dodge dealer for $95.00 (usd)
the hole dash has to come out . just change mine in a 02 dodge ram 1500.
Your heater core has failed.