Cooling Fan on High After Water Pump Replacement

[jars14011]

I have a 2021 1500 3.6. The water pump was replaced a couple weeks ago after a leak, and ever since the fan runs on high 80% of the time.

• Fan spins freely when engine is cold.
• First drive of the day, fan is off for about 15 mins while engine warms up. (ambient temps currently around 60)
• Once temps hit 180-185, fan runs high pretty much nonstop. Temp never really exceeds 190-195.

Before the pump replacement, I rarely ever heard the fan and temps were commonly over 200. Mechanic claims fan is "cooling and doing what it's supposed to do" (I understand this is technically true, but it seems to be excessively cooling). Mechanic confirmed an OEM pump was installed.

I plan to take it back to the mechanic once more before shopping elsewhere, but hoping to educate myself a bit so I can understand what is happening and give a proper report to the mechanic.

Any thoughts on what is happening? TIA

 

[BowDown]

How are the coolant temps? If theres air in the system and the sensor is in one of those air pockets, it'll read higher and keep the fans on. The waterpump itself shouldnt impact electric fan run times unless the pump is caviting itself which will create air pockets. Make sure the system is properly burped

 

[jars14011]

How are the coolant temps? If theres air in the system and the sensor is in one of those air pockets, it'll read higher and keep the fans on. The waterpump itself shouldnt impact electric fan run times unless the pump is caviting itself which will create air pockets. Make sure the system is properly burped

Thank you! The coolant temps are not exceeding 185-190. If it the sensor was in an air pocket, wouldn't the temp read much higher than that?

 

[HSKR R/T]

Did the mechanic replace the thermostat too? Coolant temps should be over 200. If it's running colder, then thermostat isnt working properly. I'd also suspect a temp sensor issue for the cooling fan. Not sure if there is a separate temp sensor to control the fan or not

 

[FastBlackRam]

Did the mechanic replace the thermostat too? Coolant temps should be over 200. If it's running xokdery, then thermostat isnt working properly. I'd also suspect a temp sensor issue for the cooling fan. Not sure if there is a separate temp sensor to control the fan or not

Mine runs at 203 F. That is above 200!!!

 

[HSKR R/T]

Mine runs at 203 F. That is above 200!!!

Yep, that's how numbers work