2017 Silverado 6.6 low coolant sensor location

[Bill D]

Have a 2017 Silverado LT 2500 HD 6.6 diesel.  Have a recurring low coolant level warning and a local shop said it was the low level sensor.  I assume it’s either in the reservoir tank or the top of the radiator. Before I take the reservoir apart, wanted to be sure that’s where it’s at. Also if it’s in the reservoir, can I replace just the sensor or do I need to replace the tank as a whole?  Any advice appreciated. 
 

cheers, Bill

[JimCost2014]

8 hours ago, Bill D said:

Have a 2017 Silverado LT 2500 HD 6.6 diesel.  Have a recurring low coolant level warning and a local shop said it was the low level sensor.  I assume it’s either in the reservoir tank or the top of the radiator. Before I take the reservoir apart, wanted to be sure that’s where it’s at. Also if it’s in the reservoir, can I replace just the sensor or do I need to replace the tank as a whole?  Any advice appreciated. 
 

cheers, Bill

Welcome to the site.

 

Repost your question in the 2015-2019 Silverado HD & Sierra HD, you will have better luck getting an answer.

 

 

[Bill D]

Thanks. 

[newdude]

3 hours ago, Bill D said:

Have a 2017 Silverado LT 2500 HD 6.6 diesel.  Have a recurring low coolant level warning and a local shop said it was the low level sensor.  I assume it’s either in the reservoir tank or the top of the radiator. Before I take the reservoir apart, wanted to be sure that’s where it’s at. Also if it’s in the reservoir, can I replace just the sensor or do I need to replace the tank as a whole?  Any advice appreciated. 
 

cheers, Bill

 

Well, you can't take the reservoir apart as its a molded plastic piece.

 

The sensor is serviced only with a new reservoir.  

 

The L5P is pretty specific on filling it back up and air bleeding as well.  Once you get it initially filled back up, you will have to run it at about 2000rpm for 3-5 minutes, idle it back down and repeat.  After that, check the level again and fill as necessary.  

 

Quote

 

Service Procedure

Warning: To avoid being burned, do not remove the radiator cap or surge tank cap while the engine is hot. The cooling system will release scalding fluid and steam under pressure if radiator cap or surge tank cap is removed while the engine and radiator are still hot.

Caution: The cap mounted to the top of the surge tank uses LEFT HAND threads. Turn the cap clockwise to remove the cap or counter clockwise to install the cap. Failure to turn the cap in the proper direction when installing or removing it may cause damage to the cap and/or the surge tank.

1. Open hood and install fender covers.
2. Remove the radiator surge tank cap (Left hand thread).
3. Remove the radiator surge tank overflow hose from the tank.
    
4. Restrict the outgoing flow from the overflow outlet with a suitable cap.
    
5. Open the lower side surge tank cap ¼ of a turn.
    
6. Using a funnel, slowly fill the radiator surge tank with 1.6 liters (1.7 quarts) of coolant to fill the lower surge tank chamber. The overflow tube will flow to the left and down as shown above and slowly move to the lower surge tank chamber.
    
7. When completed, the radiator surge tank should be filled as shown above.

   Important: Be sure the lower side surge tank cap is completely tight and locked in place to avoid getting air into the cooling system after filling. There will be a “snap” when the cap is completely closed and locked in place.

8. Tighten the lower side surge tank cap.
9. Remove the cap from the surge tank outlet.
10. Re-install the overflow hose to the radiator surge tank.
11. Install radiator surge tank cap (Left hand thread).
12. Remove fender covers and close hood.

 

 

 

[Bill D]

Thanks for the info. Bill