Loosing collant

[Gretsch]

Are you asking when you should pressure test the coolant system?

Sorry no @Seth S. Reading my post back it wasn't clear. Meant more how is the OP determining there are actually no leaks in the cooling system. Leaks on mine are impossible to find if just running engine and looking for them. Coolant just dries so fast with engine heat as to simply not be seen. Putting a pressure tester on mine revealed 3 when they were not visible by simply driving. I just included your pressure test suggestion post because it seems (to me anyway) to be a proper way to discover if the OP has a leak in his system or not. Would quickly rule out a simple leak somewhere and he could move on to the sound suggestions others have made. HTH.

 

[Seth S]

Sorry no @Seth S. Reading my post back it wasn't clear. Meant more how is the OP determining there are actually no leaks in the cooling system. Leaks on mine are impossible to find if just running engine and looking for them. Coolant just dries so fast with engine heat as to simply not be seen. Putting a pressure tester on mine revealed 3 when they were not visible by simply driving. I just included your pressure test suggestion post because it seems (to me anyway) to be a proper way to discover if the OP has a leak in his system or not. Would quickly rule out a simple leak somewhere and he could move on to the sound suggestions others have made. HTH.

no worries. I was confused if you were asking me. These are the challenges of forum posts

 

[Seth S]

Also the OP mentions a new cap and radiator. I’m wondering how recently those were replaced. If they were done recently it could easily just be air trapped in the system. Sometimes it takes a while for these trucks to burp all the air out.