As we know in today’s time Vehicles are designed with high power motors which produce a huge amount of heat. Whenever you drive your car, the radiator comes into the function it transfers the heat from the engine by using the thermal heat exchange, which resists the vehicle from overheating.

But to function the radiator properly, it should have an adequate amount of liquid coolant which is running through its core. At the time when it doesn’t have an adequate amount of radiator coolant, or it may be defective in some cases, at that time your car engine will get overheat. In the case that your car radiator ever fails you, be sure you know exactly what to do.

Here is the complete working process of the radiator. The major function of the radiator is to direct the heat away from the vehicle engine, which leads to preventing it from cracking.

The radiator also consists of the passages which are connected to fins, which tries to keep the heat away from the coolant and evacuates the heat from the vehicle’s engine compartment.

Furthermore, hot coolant also travels through the radiator and this phenomenon makes the coolant cool becomes cool, returning to the engine considerably less hot by utilising heat transfer.

How Does a Radiator Cap Work?

We all know that when we heat a liquid to its boiling point, it begins to boil and finally vaporise, as it changes its property by going from a liquid to gas.

In normal circumstances, the boiling point of water is 100 degrees, but if pressurise it we can easily pressurising it we can boost its boiling point.

Cooks perform this activity all the time. They utilise a pressure cooker so that they can cook the food faster this all happens due to the hotter water which is inside. A similar concept is used with the working of the radiator cap and the radiator.

The pressure which is inside the radiator is kept at approximately 16 pounds per square inch (in most cases), and it’s all coordinated by the radiator cap. It’s a very precarious system.

If by chance the pressure is not maintained in the radiator, at that point coolant can boil and evaporate, this will have a severe impact on the engine because of the risk of overheating and sometimes may seize down the engine.

6 Signs and Symptoms of a Bad Radiator Cap

The radiator cap of a vehicle is an essential part which helps to control the temperature. It helps in numerous purposes: seals the cooling system from various debris and contaminants, helps in maintaining the pressure and a stable boiling point, and enables the coolant to reach the radiator.

When the radiator isn’t working properly, you might notice several symptoms.

However, here we have provided a few symptoms of a bad radiator cap. With these symptoms, you can effortlessly decide either you must fix it or replace it.

#1. Coolant Leaking

If the radiator cap is fixed at that time, the appropriate amount of coolant cannot be released properly and this results in increasing the coolant temperature and coolant pressure. This leads to the leakage of the coolant from the radiator pressure cap.

When the coolant is leaked, it stays in-between the radiator upper body and the upper radiator tank. Occasionally, you might notice the liquid colour only this is due to the liquid vapours.

If you come to observe this kind of symptom, then you must replace the faulty radiator cap immediately.

You should look out at the hose clamp as sometimes it may be loose which results in coolant leakage.

#2. Antifreeze Backing Up in Overflow Tank

Sometime, you will observe that the coolant was backing up into the reservoir. This could occur if the radiator cap is not properly working and functioning well.

In case your radiator cap does not function well, the coolant won’t come back at the time when it’s required. This is also one of the symptoms of a bad radiator cap.

If you observe this kind of symptoms, you should immediately check the radiator cap. If you observe this kind of sign in the radiator cap, it should be replaced immediately.

#3. Low Coolant Level

There are numerous causes which may lead to the low coolant level in your vehicle radiator. But it might be possible that it is due to the defective radiator cap.

This usually generates a low-level coolant signal in the dashboard of your vehicle and this usually happens due to the radiator cap is leaking or constantly changing the pressure and overflowing, which usually boils down the coolant and you will face a low coolant level warning signal in your vehicle.

#4. The Air in the Cooling System

Another important sign of Bad coolant reservoir Cap is air in the cooling system. If your radiator cap becomes faulty, it will allow the air to go to the radiator cooling system. This results in going to the excessive air to go inside it.

In case if your car radiators cap seal is also Hard or damaged, it might results in excessive air deposits within the radiator.

This excessive air in the cooling system can result in some additional unnecessary pressure and it can also enhance the temperature of your vehicle coolant.

It might be possible that this increase in temperature will damage the hose pipe. So, you must keep the radiator cap properly tighten and you should utilise an appropriate one for your vehicle.

#5. Radiator Hose Collapsed

Bad Radiator Cap can break the radiator hose because of the improper vacuum which is released by the radiator cap when the temperature of the coolant minimises. If you observe this kind of symptom, you should inspect the radiator cap.

This is due to the Radiator cap problems, and if you observe any issue or any damage to the seals of the radiator cap, you must change it.

#6. Engine Overheated

If your engine is overheated, this is a very critical issue. There are numerous situations which can result in your car engine to get overheated. This may be due to the faulty of radiator fans, Coolant, Thermostat, or Fan Motor or any another electric line.

When the engine is overheated, the radiator cap is one of those parts which we normally ignore. But faulty radiator cap can easily make your engine overheated. Any fault within your radiator cap can create a lot of issues which also includes engine overheat.

So, these are some important problems which can be caused by the faulty radiator caps but to look out for the actual problem you must go to the mechanic or the reliable garage to get your radiator cap repaired.

Can a Faulty Radiator Cap Cause Overheating?

Another question that comes in mind is that does a faulty radiator cap can cause overheating, so here we provide you with complete details of how it affects the engine.  A radiator cap is one of the major parts for your vehicle because it helps in controlling the temperature of your vehicle engine.

The radiator cap is often ignored whenever we face an engine overheating issue but the radiator cap is also one of the factors which can result in overheating of the engine. A radiator cap of the vehicle looks very simple but, it is very critical and crucial for the proper functioning of the cooling system.

As we know a faulty radiator cap can result in overheating of the engine, which results in loss of coolant or major damage to the engine. As the radiator cap helps in maintaining the pressure with the Pressurized cooling system, it helps in preventing the engine from overheating and coolant loss.

Because the engine warms up and the coolant expands it will become pressurised but the radiator cap will allow releasing the excessive pressure and maintaining the appropriate coolant level.

But If the radiator cap is in fault condition or damaged, then this will not be able to maintain the appropriate pressure which results in overheating of the engine and has a severe impact on the engine.

Can a Bad Radiator Cap Cause Bubbling?

So, now the questions do a bad radiator cap could cause then the answer is No because there is no connection in-between the bubbling and the bad radiator cap.

Can You Drive with a Radiator Problem?

A faulty radiator will have some serious effects on your vehicle engine. This results in Overheating of your vehicle engine can lead to some serious damage to the engine of the vehicle and can sometimes also cause the head gasket to fail. Continue to drive your vehicle with a faulty radiator may lead to additional damage and sometimes very costly repairs.

If you observe that the engine of your vehicle is overheating, the best is to get your vehicle pull rather than driving it or let the vehicle cool down. If you are not able to get your vehicle properly function at a normal temperature, you must get it towed to a local shop for rectification.

How to Know If You Have a Bad Radiator Cap

​One of the familiar problems with the radiators is due to the bad radiator cap. But this problem comes up with numerous symptoms that could eventually damage the engine of your car and leave you helpless in the middle of the road.

But there are numerous different ways with which you can easily come to know about the bad Radiator cap before anything happens to your vehicle. We have listed down various symptoms what will happen when you have a bad radiator cap-:

#1. Check for Leaking

If you observe the liquid around the edges of the radiator cap, inspect further also. With a bad radiator cap, you could also hear antifreeze bubbling away frequently.

But you should be quite careful. You should not open the radiator cap until and unless the car and the coolant get cool off. When you open up the radiator cap if the coolant and engine are hot, it results in the spray all over you which will create some serious issues for you.

#2. Check the Plunger Condition

The spring-loaded plunger in the radiator cap can sometimes get jammed and results in trapping the coolant in a specified place, which restricts the access from the cooling system to the overflow reservoir.

Rapid visual inspection of the overflow reservoir will let you know if the spring-loaded plunger has some issues.

#3. Doing Test Using a Pressure Gauge

The issues in the radiator cap can also be checked with a pressure gauge. If while testing the pressure drops at that time, you must try to clean the radiator cap and test it again with the pressure gauge.

If after cleaning it provides you with the same results, then the radiator cap needs to be get replaced. Radiator caps are very easy to come by. They’re quite cheap and all you should buy it with having the same pressure rating.

A radiator functions as a cooling system in your vehicle, and it should be properly cleaned and must be free from all the obstacles so that it should function efficiently and properly.

For the properly working a radiator and the cooling system should be checked usually checked out after every six months so that you don’t face any issue in your radiator and radiator cap.

So, we have provided some basic and general signs and symptoms of a bad radiator cap. While driving your vehicle if you face any of the above-listed issues, then you must get your car properly checked as soon as possible.

Furthermore, if the radiator cap required to be changed, get it changed immediately. So that you won’t face any issue related to the vehicle overheating.