If the water is not circulating, either the water pump is bad or the thermostat is not opening because your engine hasn't warmed up yet or the thermostat is stuck in the closed condition. Do not attempt to remove the radiator cap after it is already running.
- Why is my coolant not flowing?
- How do I know if my coolant is circulating?
- How can I make my coolant circulate?
Why is my coolant not flowing?
The coolant level could be extremely low because of long-term neglect, or because a coolant leak has developed in the radiator or radiator hoses. ... The thermostat that allows coolant to circulate may be stuck in the closed position or a clog may have developed, perhaps from debris in the cooling system.
How do I know if my coolant is circulating?
Also, touch the lower radiator hose, after the engine has reached operating temperature. If the lower hose is hot to the touch, coolant is circulating. If the lower hose is not hot, it's possible the radiator is restricted.
How can I make my coolant circulate?
As the thermostat heats up, the hot wax expands, pushing a piston against spring pressure to open the valve and allow coolant to circulate. The thermostat is usually located in the front, top part of the engine in a water outlet housing that also serves as the connection point for the upper radiator hose.