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It sounds like there's a leak somewhere. If it's not in the cap, it could be in the hose, or the connection, or the radiator itself. If you can't figure this out on your own, take it to a mechanic.

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Q: Why doesn't the radiator of a car pull the water back from the reservoir even if the radiator cap is new?
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What causes pressure to cooling system to force water into overflow reservoir?

Radiator pressure is caused by coolant expanding as it heats. The radiator cap allows that pressure to build until it reaches a certain point (determined by the manufacturer which is why it's important to use a proper cap for the vehicle) then a spring compresses and coolant is allowed past the cap seal. The coolant flows through a hose to the overflow tank. Now here's the magic part. Back in the day, before reservoir tanks, that excess coolant just fell to the ground, wasted. Now, with the tank, the liquid is actually drawn back into the radiator as the engine (and coolant) cool. The result, an always full radiator Cheers


Why is your radiator leaking water?

the lead that goes to radiator came out, when l put back in would not hold and now leaking, water pressure was low and water is funny colour (kinda red)


How does hot water flow in a radiator?

The water pump circulates it through and it either goes across or down then back into engine.


What is a Pumped Storage Reservoir?

When there is not much demand for electricity, such as during the night, the extra electricity is used to pump water back up to a storage reservoir. Then, later in the day, when electricity demand is high, the water from the storage water is also released as an extra, producing more electricity when it is needed.


What is the analog for charge in the water model for electricity?

The "water model" for electricity is very useful, hang on to it in the back of your mind; it will serve you well. Charge is the reservoir in this model.

Related questions

Why doesn't the radiator pull the water back from the reservoir?

Radiator cap may have failed.Radiator cap may have failed.


In a 93 Toyota Camry do you put the the coolant in the radiator or the reservoir?

Both. The reservoir is the overflow. But in the event your radiator is low, your reservoir will back it up.


Why does the coolant fill up the reservoir and not return back to the radiator leaving the radiator bone dry on a 93 Honda Civic DX?

Why does the radiator fill up the reservoir


Where is the drain on a radiator of a car?

look on the bottom reservoir at the back


How does an automotive radiator reservoir work?

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


Is it normal for coolant water to go into the reservoir?

Yes- coolant reservoir is designed to accept excess coolant - As coolant heats up it will expand and flow to the coolant recovery tank (reservoir) and as it cools (contracts) it will be sucked back into the radiator


Where is the radiator cap located on Jaguar x type?

On the coolant reservoir. This is a plastic reservoir toward the back right of the engine compartment.


How do you put coolant back in the radiator in a 2001 Pontiac Grand Am GT since there is no cap on the radiator.?

Add the coolant into the coolant reservoir. Be sure the engine is cool when you remove the cap off the reservoir.


What are symptoms of Faulty radiator cap?

Overheating due to coolant going to the reservoir and not coming back to the radiator because of the bad cap.


Why could your 94 BMW be using so much coolant?

It probably has a leak. Here's something to check - the radiator has a tube coming out to the reservoir, so when it gets hot and expands the coolant goes into the reservoir and should go back into the radiator when it cools, but if your reservoir has a crack and the coolant leaks out, well it's gone and can't go back into the radiator - this would cause a lot of loss of coolant.


Where is the radiator cap on a mini cooper 2005?

Fill the system by using the reservoir mounted on the back of the engine bay to the left of the power steering fluid reservoir.


What is the purpose of the vacuum valve in a radiator cap?

It replaces coolant back into the system by drawing coolant from the reservoir that was pushed out into the reservoir during the heat up process.