When the engine is cold it should be up to the cold fill mark
The 'horseshoe' is a depiction of a reservoir, probably your wiper reservoir, but possibly your radiator reservoir, which should be about half-full when cold.
A hot radiator releases excess coolant through the spring-loaded cap in to the reservoir, and when cooled the partial vacuum created by cooled radiator pulls it back in. A reservoir should be only about 1/4 full cold on a system that uses a radiator cap, some cars have a pressurized cap on reservoir and no cap on radiator
Not necessarily! Let it cool down then check the radiator water level and the water overflow reservoir tank. In a properly operating system the reservoir adds water as needed to the radiator when it cools down after you quit driving. #1. The radiator should be full of water and the reservoir tank should be 3/4 full of water. #2. At a certain temperature or with the "AC on" the radiator fan(s) should be sucking air over the radiator and cooling coils. So! Fill the radiator and the reservoir and when it overheats in idle see if the fans behind the radiator are operating.
the overflow reservoir, it should have marks for full cold and hot
On a 2000 Ford Ranger : With the engine cold the radiator should be filled to the seat for the radiator cap and the engine coolant reservoir should be filled to the cold mark
Look to the right of the radiator cap, which is at the top of the radiator. You can't miss it. It has a "low" and a "full" line on it and your coolant level should always be between those lines.
My guess is that it should pur itself but double check with a parts store.
Open the radiator cap when engine is cool. Coolant should be right at the top. If the cooling system is healthy, the coolant reservoir will keep the system full.
It should be attached to the radiator.
Remove the radiator cap and add it directly to the radiator. Then fill the overflow reservoir to the full mark.
If there is a cap on the radiator you can check to see if the radiator is full , and if it isn't , " top up " the engine coolant . Otherwise , you check the engine coolant level at the engine coolant reservoir when the engine is cold and maintain the level at the cold mark
you don't fill the radiator directly, there is no radiator fill cap. you fill the overflow reservoir and it keeps the radiator full. overflow reservoir is spherical plastic near firewall. power steering reservoir is up front near battery.