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You are watching: 2005 dodge ram 1500 4.7 thermostat location
This page is taken directly from our digital online manual 30042 for the 1994-2008 Dodge Ram 1500, 2500, and 3500 pickup trucks, 2WD or 4WD with gasoline or diesel engines. The thermostat is important to keep the truck running properly, not overheating or running too cool. There is no set interval when you should replace the thermostat, but if you are draining the coolant for another reason, or replacing radiator hoses, you should consider the thermostat as well. 60,000 miles or 5 years is a good guideline.
Engine Thermostat Replacement
This video is specifically for the Cummins Diesel engine, the gasoline V6, V8, and V10 engine are similar
See more specific instructions below for all gasoline engines.
Warning: Do not remove the radiator cap or expansion tank cap, drain the coolant or replace the thermostat until the engine has cooled completely.
Disconnect the cable(s) from the negative battery terminal(s) – Diesel engines have two batteries – and set it aside to avoid accidental reconnection.
Drain the cooling system via the petcosk or by removing the lower radiator hose. If the coolant is relatively new or in good condition, save it and reuse it.
3.7L V6 and 4.7L V8 engines
Raise the vehicle and support it securely on jack stands.
(See illustration) Follow the lower radiator hose to the engine to locate the thermostat housing.
On 1994 through 1998 diesel engines, the alternator bracket (large arrow) must be removed, then remove the bolts (three small arrows) and lift the thermostat cover off
3.9L V6, 5.2L V8 and 5.9L V8 engines
Remove the alternator bracket and the alternator. Full detailed instructions for this are in Chapter 5 of the mslsec.com manual.
Note: On 4WD models, unplug the 4WD indicator lamp harness located behind the alternator. Follow the upper radiator to the engine to locate the thermostat housing.
Squeeze the tabs on the hose clamp to loosen it from the hose(s), then reposition the clamp several inches back up the hose. Detach the hose(s) from the thermostat housing.If the hose is stuck, grasp it near the end with a pair of adjustable pliers and twist it to break the seal, then pull it off. If the hose is old or deteriorated, just cut it off and install a new one.Note: Special hose clamp pliers are available at most auto parts stores.
If the outer surface of the thermostat housing where it mates with the hose is already deteriorated (corroded, pitted, etc.), it may be damaged further by hose removal. If it is, the thermostat housing will have to be replaced.
Remove the thermostat housing from the engine. If the housing is stuck, tap it with a soft-faced hammer to jar it loose. Be prepared for some coolant to spill as the gasket seal is broken.Note: On 8.0L V10 engines, a smaller hose and the sensor harness connector must be disconnected from the thermostat cover.
(See illustration) Note how the thermostat is installed (which end is facing up, or out, and the position of the air bleed “jiggle valve,” if equipped) and remove it from the engine.