Where is the thermostat located on a 2005 Ram 1500 6 cyl. 3.7L? Is it at the end of the top radiator hose or the lower radiator hose?

Yes, you could have bought a bad T stat. But you might want to check the radiator also.

follow the lower radiator hose to engine block,you have to raise the vechicle remove thermostat from the bottom,besure secure vechicle with jack stands.

follow the lower radiator hose to the engine,you have to raise vechicle to see thermostat it is under the vechicle,the thermostat is in the housing where hose go to thermostat housing bolted to the engine, you need to remove hose.if you have the HEMI ENGINE follow top radiator hose to thermostat housing behind the AC COMPRESSOR.

Hi, it's at the end of the lower radiator hose, and you need to remove the oil filter to get to the thermostat. Please let me know if you have more questions and thanks for using FixYa.

Why was radiator replaced?Did it have heat before ? If it was plugged, the heater core may also be plugged. Try flushing it with a water hose in both directions. I dont know why the botton radiator hose would be cold, the radiator should be a uniform temp and the air coming through the radiator should be HOT, when the engine is at operating temp. What condition was the old coolant? if it was rusty, the water pump may have lower flow than normal.

at the end of the top radiator hose. its not east to get at. housing has 2 bolts, but getting the gasket area clean is tough.

The thermostat is found at the end of the top radiator hose . Find the top radiator hose and follow it to the engine .There you will find a thermostat housing with the end of the hose attached . There will be 2 bolts holding down the housing to the engine. Undo the bolts and pull the housing off and the thermostat will be there.

thermostat is in the end of the bottom radiator hose down on the side

3.7L/4.7L:LOCATED IN LOWER HOUSING ATTACHED TO TIMING COVER..WHERE LOWER RAD HOSE GOES TO ENGINE..PLASTIC HOUSING WITH 2 BOLTS.
5.7L:IN WATER PUMP UPPER HOUSING WHERE METAL HOUSING ATTACHES FROM UPPER RAD HOSE..MAKE SURE ON ALL ENGINES YOU REMOVE BLEED PLUG WHEN REFILLING COOLING SYSTEM TO GET RID OF AIR TO PREVENT ENGINE OVERHEATING

You didn't post your engine size so I am posting both location info:

On the 4-cylinder engines, unbolt the water outlet from the thermostat housing, remove the outlet from the housing and lift the thermostat out of the housing. On all other models, unbolt the water outlet from the intake manifold, remove the outlet and lift the thermostat out of the manifold.


On the 6 cyl, it will be where the number 5 is pointing: