Bypass hose.
"Does the top or bottom heater hose from the firewall go to the water pump on a 1991 Dodge Dakota V6?" The top heater hose from the firewall goes to the water pump and the bottom hose from the firewall goes to the top of the block where the temperature thermostat housing is located.
That hose goes to your heater core, follow the hose to passenger side of the firewall.
On my 1995 Ford Explorer , 4.0L V6 , the lower rad hose goes from the radiator and connects to the water pump
It is under the housing where the upper radiator hose attaches to the engine.
Where the lower hose goes on the engine, it is under that housing.
rite against your firewall under the hood
Water neck
You can get that picture from google.com.
It is under the housing where the upper hose goes on the engine.
Remove the bottom radiator hose from your 1995 Chevy Lumina radiator. Put a water hose in the top of the radiator. Allow the water hose to run. Keep the water running until clear water runs out of the bottom of the radiator.
to locate a thermostat you need to follow the water hose that goes in to the engine.it is usually located to the left hand side of the engine coming out of the radiator
To find the thermostat: 1. Trace the big hose on the top of the radiator back to the engine. 2. The big hose goes to the water outlet housing. 3. Take the housing off and the thermostat is inside.