Where is the thermostat on a Toyota 4 Runner?
The thermostat is a little device that is located between the radiator and the engine of your Toyota 4Runner. The thermostat is designed to block the coolant flow to the engine until the engine reaches its operating temperature.
Where is the coolant thermostat located?
Most cars have a top-mounted thermostat located close to the water pump on the cylinder head. The top radiator hose feeds coolant through the thermostat into the engine. If you can’t locate the thermostat, simply follow the hose until you see the housing containing the thermostat where the hose joins the engine.
How does the thermostat work on a Toyota 4Runner?
When you start your car and the engine is cold, the flow of coolant is stopped by the thermostat so that the engine warms up and reaches maximum efficiency faster. Once the coolant temperature passes the thermostat temperature, the thermostat opens and allows coolant to flow around the engine block, radiator, etc.
Where is the stopcock on a Toyota 4Runner?
On the driver’s side of the bottom of the radiator, you will see a stopcock that you can open to drain the coolant. Make sure your drain pan is underneath the stopcock. If your coolant is clean or newly flushed, then only drain enough coolant to bring the system level under the thermostat. If you plan on replacing the coolant, then drain all of it.
Can a bad thermostat cause a Toyota to overheat?
The fan switch is bad – The fan switch comes on when the coolant is a set temperature. You can test the switch by disconnecting the wiring harness and using a jumper wire on the contacts. If the fan starts, the switch is bad and needs to be replaced. A symptom of a bad thermostat is an engine that overheats at highway speeds.
When does the cooling fan come on on a Toyota?
The cooling fan is usually activated when the air is running at medium or high speed. The fan switch is bad – The fan switch comes on when the coolant is a set temperature. You can test the switch by disconnecting the wiring harness and using a jumper wire on the contacts.