Cap, Radiator: Inspection
WARNING: This page is about a different car, the 2022 RAM ProMaster 3500, 2022 RAM ProMaster 2500, and 2022 RAM ProMaster 1500. However, it is still accessible from the selected car via links, so may be relevant.
| 1 - VENT VALVE |
| 2 - O-RING SEAL |
The vent valve (1) at the bottom of cap should be closed. A slight downward pull on the vent valve should open it. If the rubber gasket (2) is swollen and prevents the vent valve from opening, replace cap.
Hold cap at eye level, upside down. If any light can be seen between vent valve and rubber gasket, replace cap. A replacement cap must be the type designed for a coolant reserve/overflow system with a completely sealed diaphragm spring and a rubber gasket.