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Some Dodges don't have inertia switches.. They have a shutdown relay that senses when an engine has stopped and shuts off the pump. It is a relay somewhere by the passenger side strut tower in the engine compartment near the distribution box. You cannot reset it. It must be replaced if it goes bad.
mskentland69, The water pump for your vehicle is located under the front engine cover and is operated by the timing belt. To access this you have to remove the forward motor mount, both of the belts, the right side splash guard, the crank shaft pulley and the cover. This is a two piece pump that has to be taken apart as you will reuse the back portion of it. It is usually recommended that you replace the timing belt at the same time. If you had a timing belt problem then it is recommended that you change the water pump at that time. Good luck with this.
WATER PUMP - 3.3/3.8L ENGINE
Drain Cooling System. Refer to procedure in this section.
Remove accessory drive belt. Refer to procedure in this section.
Remove right front lower fender shield.
Remove water pump pulley bolts and remove pulley.
Remove water pump mounting screws Water Pump - 3.3/3.8L Engine Remove water pump.
Remove and discard O-ring seal.
Clean O-ring groove and O-ring surfaces on pump and chain case cover. Take care not to scratch or gouge sealing surface.
Install new O-ring into groove Water Pump Body
Install water pump to chain case cover. Tighten screws to 12 N·m (105 in. lbs.)
Rotate pump by hand to check for freedom of movement.
Position pulley on pump. Install screws and tighten to 30 N·m (250 in. lbs.)
Install accessory drive belt. Refer to procedure in this section.
Install right front lower fender shield.
Refill Cooling System. Refer to procedure in this section.
There is a water valve on behind the motor close to the firewall. This valve is to stop the water flow while the A/C is in operation. It maybe bad and locked in close postion not allowing the water to get to the heater core.
Check starter relay at the time of a no start. It will be the 2nd relay from the water jug. Just have someone to attempt to start it while you are holding you hand on that relay. It it doesn't click, tap it with the back of a screwdriver handle. If it starts then, replace the relay.