Code p1391 I have a 2000 Dodge Ram 1500 4x4, 5.9 engine. I changed the thermostat, coolant pump, front oil seal and the power steering pump and power steering gear. Also replaced rotor and cap. When I started the truck it was running rough and erractic and put out code 340. I changed the cam sensor and restarted the truck and got codes 340,320,and 1391. I checked the spark plugs and regapped and inspected the wiring. Now I get code 1391 only and engine still runs rough and erractic.

drain the rad into a pail.
remove the upper rad hose from the thermostat housing.
remove the thermostat housing
remove the gasket/seal (from housing or engine)
remove thermostat

install ne stat & gasket/seal
reinstall housing and hose.

close off rad bottom valve
refill rad with new coolant (with cap off run engine until warm
top up fluid to neck) replace cap.

dispose of old fluid at environmental recycle center

Drain coolant,pull radiator,fan shroud off.Need a fan tool to get that off.Need to pull ac,alt,ps and brackets off. to expose front of engine. Need crank pulley puller. Once that's done the timing cover can be removed. Hint,spring for a new timing set. loosen engine mounts and lift engine at bell-housing remove oil pan bolts.and reverse.Might as well replace oil pump if you intend to keep the van.

Check this procedure for...
2.7L Engine

1. Disconnect negative cable.
   CAUTION Do not remove pressure cap with the system hot and under pressure because serious burns from coolant can occur.
2. Drain cooling system.
   
3. Remove radiator lower hose from thermostat housing.
   
4. Remove nuts from heater tube flange studs.
   
5. Loosen starter bolt at heater tube bracket.
   
6. Pull heater tube out of thermostat housing and position out of the way.
   
7. Remove bolt and two studs.
   
8. Remove thermostat housing, O-ring and thermostat.
   
9. Remove thermostat housing bolts.

To install:

1. Clean gasket sealing surfaces.
   NOTE Install thermostat with the bleed valve located at the 12 o'clock position, between tabs on seal.
2. Install thermostat and seal into thermostat housing .
   
3. If removed, install two studs.
   
4. Install thermostat, thermostat housing and O-ring and bolt. Tighten attaching bolts to 105 inch lbs.(12 Nm).
   
5. Lubricate new heater return tube O-ring with coolant.
   
6. Position heater return tube flange over two studs. Install nuts.
   
7. Tighten retaining nuts to 53 inch lbs.(6 Nm).
   
8. Tighten starter bolt to 40 ft. lbs. (54.3 Nm).
   
9. Connect the lower radiator hose to the thermostat housing. Install hose clamps.
   
10. Refill cooling system.
    
11. Inspect for leaks.
    
12. Connect negative cable.

3.2L & 3.5L Engines

1. Disconnect negative cable.
   CAUTION Do not remove pressure cap with the system hot and under pressure because serious burns from coolant can occur.
   
2. Drain cooling system.
   
3. Raise vehicle on hoist.
   
4. Disconnect electrical connectors from engine oil and power steering pressure switches.
   
5. Disconnect radiator and heater hoses from thermostat housing.
   
6. Remove thermostat housing bolts.
   
7. Remove housing, thermostat, and gasket.
   NOTE The OEM thermostat is staked in place at the factory. To ensure proper seating of replacement thermostat, carefully remove the bulged metal from the thermostat housing using a suitable hand held grinder. It is not necessary to restake the replacement thermostat into the thermostat housing.

To install:

1. Position gasket on thermostat and housing.
   
2. Install thermostat housing, gasket and mounting bolts onto block. Tighten attaching bolts to 105 inch lbs. (12 Nm).
   
3. Install radiator hose.
   
4. Install bypass hose.
   
5. Connect electrical connectors from engine oil and power steering pressure switches.
   
6. Connect negative cable.
   
7. Fill cooling system.
   
8. Inspect for leaks.
   
9. Lower vehicle on hoist.

Hope helps (remember to rate and comment thius answer).

II got a dodge 1500 4.7. The problem is, the oil cab is all green and im losing coolant all the time, there's smoke coming out smells bad, but no check engine at all. So I took it to a shop to check it they said, it's a water pump ,I changed the water pump but still losing coolant ............ so is it head gasket, manifold gasket, valve stem seal, piston rings, or something I don't know of??

two bolts on the thermostatic housing connected to a thick hose.

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2.7L Engine

1. Disconnect negative cable.
   CAUTION Do not remove pressure cap with the system hot and under pressure because serious burns from coolant can occur.
   
2. Drain cooling system.
3. Remove radiator lower hose from thermostat housing.
4. Remove nuts from heater tube flange studs.
5. Loosen starter bolt at heater tube bracket.
6. Pull heater tube out of thermostat housing and position out of the way.
7. Remove bolt and two studs.
8. Remove thermostat housing, O-ring and thermostat.
9. Remove thermostat housing bolts.

To install:

1. Clean gasket sealing surfaces.
   NOTE Install thermostat with the bleed valve located at the 12 o'clock position, between tabs on seal.
   
2. Install thermostat and seal into thermostat housing .
3. If removed, install two studs.
4. Install thermostat, thermostat housing and O-ring and bolt. Tighten attaching bolts to 105 inch lbs.(12 Nm).
5. Lubricate new heater return tube O-ring with coolant.
6. Position heater return tube flange over two studs. Install nuts.
7. Tighten retaining nuts to 53 inch lbs.(6 Nm).
8. Tighten starter bolt to 40 ft. lbs. (54.3 Nm).
9. Connect the lower radiator hose to the thermostat housing. Install hose clamps.
10. Refill cooling system.
11. Inspect for leaks.
12. Connect negative cable.

3.2L & 3.5L Engines

1. Disconnect negative cable.
   CAUTION Do not remove pressure cap with the system hot and under pressure because serious burns from coolant can occur.
   
2. Drain cooling system.
3. Raise vehicle on hoist.
4. Disconnect electrical connectors from engine oil and power steering pressure switches.
5. Disconnect radiator and heater hoses from thermostat housing.
6. Remove thermostat housing bolts.
7. Remove housing, thermostat, and gasket.
   NOTE The OEM thermostat is staked in place at the factory. To ensure proper seating of replacement thermostat, carefully remove the bulged metal from the thermostat housing using a suitable hand held grinder. It is not necessary to restake the replacement thermostat into the thermostat housing.
   

To install:

1. Position gasket on thermostat and housing.
2. Install thermostat housing, gasket and mounting bolts onto block. Tighten attaching bolts to 105 inch lbs. (12 Nm).
3. Install radiator hose.
4. Install bypass hose.
5. Connect electrical connectors from engine oil and power steering pressure switches.
6. Connect negative cable.
7. Fill cooling system.
8. Inspect for leaks.
9. Lower vehicle on hoist.

The thermostat is operated by a wax filled chamber (pellet) which is sealed. When heated coolant reaches a predetermined temperature the wax pellet expands enough to overcome the closing spring and water pump pressure, which forces the valve to open. Coolant leakage into the pellet will cause a thermostat to fail open. Do not attempt to free up a thermostat with a screwdriver. Thermostat diagnostics is included in power train control module's (PCM) programming for on-board diagnosis. The malfunction indicator light (MIL) will illuminate and a diagnostic trouble code (DTC) will be set when an -open too soon- condition occurs. Do not change a thermostat for lack of heater performance or temperature gauge position, unless a DTC is present. For other probable causes,. Thermostat failing shut is the normal long term mode of failure, and normally, only on high mileage vehicles. The temperature gauge will indicate this.
The engine cooling thermostats are a wax pellet driven, reverse poppet choke type. The thermostats have an air bleed located in the thermostat flange. The air bleed allows internal trapped air during cooling system filling to be released. The thermostat on the 2.7L and 3.5L engines are located on the lower left side of engine, near the front. The thermostat on both engines are on the inlet side of the water pump.
The thermostat is designed to provide the fastest warm up possible by preventing leakage through it and to guarantee a minimum engine operating temperature of 88 to 93°C (192 to 199°F). The thermostat also will automatically reach wide open so it will not restrict flow to the radiator as temperature of the coolant rises in hot weather to around 104°C (220°F). Above this temperature the coolant temperature is controlled by the radiator, fan, and ambient temperature, not the thermostat.
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this is most likely the water pump if it is leaking at front of engine, the water pump is under the large timing belt cover and driven by the timing belt, so both are changed at the same time.

The power steering pump is piggie backed to the vacuum pump. The seal in the back of the vacuum pump has engin oil under presure behind it cousing a leak that gets worse over time. Cummins make a seal kit to fix this leak.

there is a seal in there between the 2, and I think that drives are back to back. its hard to get at in the truck, so if your'e gonna service it , remove it from the engine first, and clean it all up

I did an engine swap because of a rod knock and when I removed the power steering pump the seal was upset and would not seal again. I found a guy on the internet who had a kit for under $75 shipping included (sorry can't remember sight name). This kit comes with a new improved two lip seal, couple o-rings, gasket, home made tools, and a video showing how to install the new seals. I installed the kit and it fixed the leak in about 3 hours. The dodge dealer wants $1100.00 for a rebuilt vacumme pump. Do a google for power steering leak.This is a very common problem even for a pump that has not been removed.

48,000 miles or 48 months
Maintenance Service Schedule 2007 dodge
Change engine oil and engine oil filter
Rotate tires
Lubricate drivetrain / steering / suspension
grease fittings (if equipped)-except Powerwagon
Lubricate front drive shaft fitting
(2500 / 3500, 4X4 & Powewagon)
Lubricate tie rod end links - Powerwagon
Check automatic transmission fluid level
Check manual transmission fluid level
Check the coolant level, hoses and clamps
Inspect exhaust system
Inspect brake hoses and brake linings
Inspect the CV joints/U-joints (if equipped) and
front suspension components
Check spare tire for proper pressure & correct
stowage
Lubricate outer tie rod ends 2500/3500 4X4

51,000 miles or 51 months
Maintenance Service Schedule
Change engine oil and engine oil filter
Lubricate drivetrain / steering / suspension
grease fittings (if equipped)-except Powerwagon
Lubricate front drive shaft fitting
(2500/3500, 4X4 & Powerwagon)
Lubricate tie rod end links - Powerwagon
Check automatic transmission fluid level
Check manual transmission fluid level
Check the coolant level, hoses and clamps
Inspect exhaust system
Inspect brake hoses
Inspect the CV joints/U-joints (if equipped) and
front suspension components