How To Find A Coolant Leak In Jeep Grand Cherokee - You Don't Need A Pressure Tester

By Nick Marchenko, PhD

Updated: September 28, 2023

Coolant plays a crucial role in supporting the optimal operation of your Jeep Grand Cherokee’s engine. It circulates through the cooling system, serving as a temperature controller and keeping the engine from overheating while running.

The feature of a coolant should be considered, as with it, the engine that works at extreme temperatures may avoid significant damage.

A sufficient coolant level keeps your Jeep's engine at a minimum temperature. Such unpleasant events as road accidents or breakdowns can lead to coolant leaks.

If it occurs, the coolant level decreases gradually until it reaches zero, which can lead to more disastrous consequences.

You can find the leak yourself, but if you need more confidence in your abilities or have searched everywhere and found nothing - it is better to take the Jeep Grand Cherokee to a mechanic. This problem must be solved.

Key Takeaways

• Coolant is essential for preventing a Jeep Grand Cherokee’s engine from overheating, and a leak can lead to significant engine damage.
• Signs of an coolant leak include puddles under the car, a sweetish smell, fogging windows, and frequent overheating.
• Detecting the source of an coolant leak may require visual inspection, use of special dyes, smoke testing, or engine disassembly, depending on the severity.
• Addressing coolant leaks promptly and carrying essentials like adhesive tape and spare coolant can prevent further damage and ensure the vehicle’s longevity.

What are the signs that the Jeep Grand Cherokee has coolant leaks?

Determining that a Jeep Grand Cherokee has an coolant leak somewhere is very simple. You`ll understand everything immediately, but here is a list of the most obvious signs that your coolant is leaking:

Puddles under the car

This is the surest sign of a malfunction if you see a puddle under your Jeep Grand Cherokee. If the formation of a puddle once can be attributed to condensation, then if puddles appear constantly, no matter where you park the vehicle, this clearly indicates a fluid leak. Check the fluid to the touch.

Coolant is a colored liquid with a slightly oily structure and a sweet smell. Don`t confuse it with oil - it is darker and more viscous. However, in any case, if you see puddles of oil or coolant under the Jeep Grand Cherokee, fix the cause as soon as possible;

Sweetish smell

Coolant has a rather specific smell that is hard not to notice. Therefore, if while walking near the Jeep Grand Cherokee or sitting in the cabin, you feel a sweet aroma, coolant is probably leaking somewhere;

Your windows fog up when the interior heater is running

This symptom is not widespread and appears only if coolant leaks somewhere around the radiator of the interior heater;
The Jeep Grand Cherokee is overheating. Since coolant is designed to prevent overheating of the car, its absence will, accordingly, lead to such consequences.

Therefore, if you notice that your Jeep Grand Cherokee has started to overheat frequently, check the coolant level. If it has decreased, it is most likely that there is a leak somewhere.

Can I drive my Jeep Grand Cherokee with an coolant leak?

Driving with leaking coolant is quite undesirable. Of course, if you notice it somewhere far from home or the nearest workshop, you can drive to the destination and quickly start repairs carefully.

However, you should pay attention to the problem and drive the Jeep Grand Cherokee as if nothing had happened. Driving with leaking coolant can cause the following:

• Coolant can completely leak out at the most unpleasant and inconvenient moment. The system is still full of liquid, but it is not. It can end up very far from your home. You simply won't get far without coolant;
• Coolant burns very easily. Even though coolant consists of a large amount of water, it catches fire very easily.

You need to find out exactly where the leak originated, do you? If coolant begins to flow on hot surfaces (for example, on the exhaust manifold), then due to the high temperature, it will simply catch fire, along with the entire underhood space.

 How do you find a coolant leak in a Jeep Grand Cherokee?

It is easy to understand that your Jeep Grand Cherokee has an coolant leak. However, finding the reason for this may take a lot of work. Therefore, if you find a problem, be patient; you can spend more than an hour searching. We have compiled a list of the easiest ways to find an coolant leak.

Without disassembling the engine

Quite often, the source of coolant leakage can be found without resorting to very drastic measures. We advise you to start with a simple method, just follow the steps below:

• Warm up the Jeep's engine to operating temperature, drive a little, and do your routine tasks. This is necessary to let the coolant circulate through the system - so it's easier to find the problem soon;
• Park the vehicle on a flat surface, preferably clean and free of stains and puddles that can be confused with antifreeze;

Extremely important! Let the motor cool down a bit. At engine operating temperature, coolant is under high pressure in the system.

In no case, don`t unscrew the cap of the radiator or expansion tank when the engine is still at a high temperature - the hot liquid will get directly into your face.

Where to start

• Therefore, after parking the Jeep Grand Cherokee, let it cool for at least 10-15 minutes before proceeding;
• Open the hood. Conduct a visual inspection of the underhood space. Look for damp places. Coolant can both drip and flow in whole jets;

Check the hoses

Look for puddles under the Jeep Grand Cherokee - they are usually located directly under the leak. Leaks often occur due to cracks or holes in rubber pipes or metal engine elements. Examine them first. Look at the joints of the tubes with other elements. If it's dripping from there, you may need to tighten the clamp holding it in place.

Look at the diagram of your Jeep's cooling system - some pipes may be located in unusual places, and you won`t see them so easily - however, the leak may be right there.

If you can't visually see leaks anywhere, try to cause coolant to move through the system. To do this, squeeze one of the pipes with your hand (preferably the thickest one near the radiator) and shake it (squeeze it). Thus, you pump coolant, and there is a possibility that under the influence of pressure, the leak will increase, and you will see it;

Water pump

Check the pump. It is made to drive coolant through the system, and if it fails, it begins to leak liquid through itself. Refer to your Jeep Grand Cherokee’s manual for the location of the pump. But since it comes into effect on the timing belt, it is necessary to look for it there;

Expansion tank

The leakage of antifreeze can be directly related to the expansion tank. Check that the cap is firmly closed and that there are no cracks on the tank;

Radiator

Inspect your radiator - antifreeze will always pass through it, and the leak could be there. The fact is that the radiator is quite delicate and can be easily damaged - for example, by a flying stone from another car.

Look at it attentively: are there any holes? Cracks? Are the radiator honeycombs damaged?;

Using an UV light to find a leak

If you haven't found anything in the light, the darkness may help you. Use special dyes: they are poured into the expansion tank and mixed with coolant.

When illuminated with an ultraviolet lamp, the coolant will glow bright, and you will easily find the leak.

However, the disadvantages of this method are that you need an ultraviolet lamp and a dark room where there are no other light sources;

Symptoms of cylinder head gasket damage

Remember that coolant can leak both outside the engine and inside. If you have damaged the cylinder head gasket due to overheating, antifreeze will begin to seep into the combustion chamber and into the channels through which oil is supplied. This can lead to expensive engine repairs.

• An emulsion (a milky-cream-colored substance) forms when oil is mixed with antifreeze. The emulsion can be seen on the dipstick.
• You cannot drive with such a liquid because it cannot fully protect the engine from overheating and, moreover, because it is quite sticky and clogs the engine from the inside;
• Gray or white smoke from the exhaust pipe. This happens as a result of the combustion of coolant with gasoline;
• Bubbles in the expansion tank. With the engine running, you can see bubbling from the expansion tank. Look, if bubbles are actively forming there, the gasket is damaged.

With engine disassembly

If things are serious, and you can't find the cause of the coolant leak without disassembling the engine, it's time to take more decisive action.

Before disassembling the engine, try to find the leak with the help of smoke. Drain the coolant from the system. Make sure it is airtight.

Using the smoke generator, blow smoke into the expansion tank. If there is a leak (a hole) in the system, then smoke will start to come out of it - and you will find where your antifreeze usually comes from;

Cranks inside the engine

If it didn't help, disassemble the engine. Check the serviceability of the cylinder head gasket, thermostat, and pump. As practice shows, leaks most often occur because of them;

Look for cracks in the engine block. Between the cylinders, in the channels through which the coolant circulates.

Remember, there should not be a single crack in your engine. If you find any, then this is where the coolant leaks from.

What you need to know if a Jeep Grand Cherokee has coolant leaking

A leaking coolant problem in a Jeep Grand Cherokee can be unpleasant.

Knowing the root cause and immediate steps to take when you discover antifreeze leaking from your Jeep Grand Cherokee is critical for preventing further damage and ensuring the safe operation of your vehicle`s engine.

Useful tips if coolant is leaking:

• Carry adhesive or reinforced tape with you. If you happen to have one of your cooling pipes break on the road and coolant leaks out of it, you can patch up the hole by taping it up to get to the repair place;
• Have a canister of coolant with you. You never know when you will need it, and in a critical situation, it can save you when you need to fill the system a little to get to your destination safely;
• Do not mix antifreeze of different colors - this can lead to engine damage. The chemical compositions of the various coolant products differ, and when combined, they can cause chemical reactions and sediment formation, which may cause damage to your engine's cooling system;
• If the coolant level in your Jeep Grand Cherokee's system has dropped to a critical level and you cannot top it up, use distilled water.

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Remember, distilled water only. It is cleaned of minerals and impurities so that it won't harm your engine. Just pour it into the expansion tank and drive to the repair site.

To Wrap Everything Up

Detecting and repairing a coolant leak in your Jeep Grand Cherokee is important to maintaining your engine's good condition and performance.

You may recognize possible leaks by highlighting warning signs such as overheating, low coolant levels, or unusual smells.

Finally, timely detection and repair of antifreeze leaks will not only prevent engine damage but also increase the lifespan and durability of your Jeep Grand Cherokee.