It is on the evaporator, inside the vehicle, under the trim on the right rear.
the expansion valve is on the passenger side firewall in the engine compartment.
Underneath those boxes on the valve covers
Looking at the engine from the front bumper the front expansion valve is located on the far left low on the fire wall. Follow the ac lines down and it leads to the expansion valve mounted on the fire wall. The best way to access it is to remove the inner fender well behind the passenger side front wheel.
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The 2004 Dodge Durango EGR valve can be found on the firewall in the engine compartment. The EGR valve will be on the passenger side of the firewall.
A Dodge Durango does not have a water control valve in the heater plumbing. The cabin temperature is controlled with airflow control doors.
passenger side valve cover
An emergency shut off is used in some vehicles to stop power to the fuel pump during an accident. The 2002 Dodge Durango does not have an emergency shut off.
The PCV value on a 2003 Dodge Durango is on the side of the oil fill shaft.
There isn't a water control valve.
99 Durango doesn't have a Heater Control Valve, It only has a thermostat