The OEM plastic fitting near the cylinder head is prone to cracking and leaking due heat and age. Replace it once and for all with the S&B Heater Core Supply Hose which features a stainless steel fitting and heavy duty silicone wrapped hose.
Blessed Performance has the S&B Heater Core Supply Hose for 2003-2024 Dodge Ram 2500/3500, 5.9L & 6.7L.