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Vehicle Maintenance

Why Is My Engine Overheating?

by Isabella Bravo · August 25, 2026

In this guide, Access Roadside Assistance explains the most common reasons an engine overheats, the warning signs to watch for, and what you should do if your temperature gauge suddenly rises.

An overheating engine is more than an inconvenience, it can be a serious warning that something isn't working properly under the hood. Continuing to drive an overheating vehicle can lead to expensive engine damage, so knowing what causes overheating and what to do when it happens can help keep you and your vehicle safe.

What Does It Mean When Your Engine Overheats?

Your engine produces a significant amount of heat while running. Your vehicle's cooling system is designed to regulate that temperature and prevent the engine from getting too hot.

When the cooling system can't remove enough heat, the engine temperature rises beyond its normal operating range. This is when your vehicle may begin to overheat.

Depending on the cause, an overheating engine can result in anything from a simple cooling-system issue to serious engine damage.

7 Common Reasons Your Engine May Be Overheating

1. Low Coolant
One of the most common causes of overheating is insufficient coolant. Coolant, also called antifreeze, absorbs heat from the engine and carries it to the radiator where that heat can be released. If the coolant level is too low, the system may not be able to properly regulate engine temperature. Low coolant can be caused by a leak, poor maintenance, or another problem within the cooling system.

Important: Never remove the radiator cap while the engine is hot. The cooling system can be under significant pressure, and hot coolant can cause serious burns.

2. Coolant Leak
A leak anywhere in the cooling system can cause coolant levels to drop and eventually lead to overheating.

  • Leaks can occur in:
  • Radiator hoses
  • The radiator
  • Water pump
  • Thermostat housing
  • Coolant reservoir
  • Gaskets and other cooling-system components


If you notice a puddle or fluid under your vehicle, don't assume it's harmless. Have the vehicle inspected before continuing to drive.

3. Faulty Thermostat
The thermostat controls the flow of coolant between the engine and radiator. If the thermostat becomes stuck closed, coolant may not circulate properly. As a result, the engine can quickly become hotter than normal.

A faulty thermostat can sometimes cause overheating even when the coolant level appears normal.

4. Radiator Problems
The radiator plays a critical role in removing heat from engine coolant. A damaged, clogged, or malfunctioning radiator may not be able to dissipate enough heat. Corrosion, debris, leaks, or internal blockages can all affect radiator performance.

5. Cooling Fan Failure
Your cooling fan helps move air through the radiator, particularly when the vehicle is stopped or moving slowly. If the fan isn't working correctly, your engine may begin to overheat, especially in traffic or during hot weather.

6. Water Pump Failure
The water pump circulates coolant throughout the engine and cooling system. If the water pump fails or isn't circulating coolant properly, the engine can quickly reach unsafe temperatures. A failing water pump may also produce unusual noises or cause coolant to leak.

7. Extreme Heat, Heavy Loads or Stop-and-Go Traffic
Sometimes environmental and driving conditions can contribute to overheating. Hot weather, heavy towing, long uphill drives, and extended periods of stop-and-go traffic can put additional strain on the cooling system. However, a healthy cooling system should still be able to manage normal operating temperatures. Repeated overheating shouldn't be considered normal.

Signs Your Engine May Be Overheating

Your vehicle may give you several warnings before serious damage occurs.

Watch for:

  • A temperature gauge moving into the red zone
  • An overheating warning light
  • Steam or vapor coming from under the hood
  • A strong or unusual coolant smell
  • Reduced engine performance
  • Unusual noises
  • Coolant leaking underneath the vehicle
  • The engine running noticeably hotter than usual
  • If you notice these signs, don't ignore them.

What Should You Do If Your Engine Overheats?

If your temperature gauge enters the red zone or you receive an overheating warning, safely pull over as soon as possible.

Follow these steps:

1. Find a Safe Place to Stop
Pull off the road and park somewhere safe away from traffic whenever possible.

2. Turn Off the Engine
Turn the vehicle off and allow the engine to cool down.

3. Do Not Open the Radiator Cap
Never open a hot radiator or cooling-system reservoir that is under pressure. Hot coolant and steam can cause severe burns.

4. Check for Obvious Problems Once the Vehicle Is Cool
After the engine has had sufficient time to cool, you may visually inspect for obvious signs of a coolant leak or other issue.

Avoid reaching into the engine compartment or touching hot components.

5. Don't Keep Driving If the Problem Continues
If the engine overheats again, coolant is leaking, or you aren't sure what's causing the problem, continuing to drive could turn a relatively manageable repair into major engine damage.

This is where roadside assistance can help.

Can I Drive an Overheating Car?

It's generally not a good idea to continue driving a vehicle that is actively overheating. Driving while the engine is excessively hot can potentially cause serious damage to components such as the head gasket, cylinder head, or engine block.

If your vehicle is overheating, the safest option is to pull over, allow it to cool, and determine whether professional assistance is needed.

When Should You Call Roadside Assistance?

Consider calling roadside assistance if:

  • Your vehicle continues to overheat
  • You see coolant leaking
  • Your engine won't restart after overheating
  • You're stranded somewhere unsafe
  • You don't know what's causing the problem
  • You need your vehicle transported to a repair facility


A roadside assistance provider can help determine the appropriate next step and, when necessary, arrange towing for your vehicle.

How Can You Prevent Engine Overheating?

Regular maintenance can help reduce the likelihood of cooling-system problems.

Make sure you:

  • Check your coolant according to your vehicle manufacturer's recommendations
  • Have coolant leaks inspected promptly
  • Follow your vehicle's recommended maintenance schedule
  • Pay attention to changes in your temperature gauge
  • Have unusual engine or cooling-system noises inspected
  • Keep an eye out for fluid leaks
  • Have your cooling system inspected if your vehicle has overheated previously


It's also a good idea to know where your vehicle's temperature gauge and warning lights are before you actually need them.

Stay Prepared With Access Roadside Assistance

A vehicle problem can happen when you least expect it. Whether you're commuting to work, taking a road trip, or simply running errands, knowing you have help available can provide valuable peace of mind.

Access Roadside Assistance provides roadside assistance services designed to help drivers get back on the road when unexpected vehicle problems occur. Depending on your membership, services may include towing, battery boosts, flat tire assistance, lockout service, fuel delivery, and more.

If your engine starts overheating, don't take the risk of driving until the problem gets worse. Pull over safely, let your vehicle cool down, and get the assistance you need.

Need Roadside Assistance?

Learn more about Access Roadside Assistance memberships and get the protection you need before an unexpected breakdown leaves you stranded.

Access Roadside Assistance — helping keep you moving when the unexpected happens.


This article is intended for general informational purposes and does not replace advice from a qualified automotive professional. Always follow your vehicle manufacturer's safety and maintenance recommendations.