How To Clean Your Jeep Grand Cherokee’s Engine

By Nick Marchenko, PhD

Updated: July 12, 2023

The engine of the Jeep Grand Cherokee is the mechanical heart upon which acceleration, speed, and driving experience depend. Proper engine maintenance guarantees its longevity and prevents any possible issues.

During daily operation, the engine gradually becomes dirty; dust and dirt stick to it, and traces of runny lubricant, antifreeze, or other contamination may appear in various places.

Such dirtiness not only affects the engine's appearance and makes it less appealing due to a huge amount of external mixed dirt and contamination, but it may also affect its efficiency. 

For example, an engine covered in a huge load of dirt may overheat easily because the heat transfer process is violated. Moreover, when the engine is dirty, it becomes more difficult to spot external signs of malfunctions, such as a new oil leak or crack.

So it is important to take care of your Jeep Grand Cherokee everywhere: outside (car`s body) and inside (interior, engine bay, etc.).

It is advised to clean your Jeep Grand Cherokee engine at least once every few years. However, engine cleanup procedures should be done more often if you live in an area with constant dust, dirt, and sand.

DISCLAIMER / ATTENTION:

The Jeep Grand Cherokee’s engine washing is a complicated process that requires many factors to be considered. A violation of the washing procedure can lead to complete engine failure or an expensive repair.

So that, as a result, we do not turn out to be extreme—we give a thorough guide on how to do it, but no one excludes the error of the user.

If you need more clarification, you can wash the engine on your own, it is better to leave this task to professionals who will make it fast and safe.

Is it necessary to wash the Jeep Grand Cherokee`s engine?

Novice Jeep Grand Cherokee owners are often interested in the necessity of engine washing. There is no unanimous opinion among motorists on this matter.

The formation of dirt and adhering dust negatively affect the functionality of the motor, resulting in the following:

• heat transfer worsening;
• power decrease;
• increased fuel consumption;
• the risk of spontaneous combustion.

After assessing all these dangers, it becomes clear why you should wash the engine. There is no periodicity for this procedure.

It depends on the intensity, how you use your vehicle, and its design features. Washing the power unit is only necessary in certain situations:

• severe contamination of the motor due to failure of pipes, seals, and other similar parts;
• determination of the cause of leakage of working fluids;
• preparation of the car for overhaul and sale.

What do you need to clean your Jeep Grand Cherokee’s engine?

Before starting engine cleaning, one has to understand that it requires responsibility, patience, and attentiveness. Additionally, take care to have all the necessary items with you in advance, among which are:

• Electric contact spray;
• Brush;
• Rag(s);
• WD-40;
• Hose or high-pressure washer;
• Car shampoo or degreaser;
• Polyethylene bags;
• Duct tape;
• Hose for blowing with compressed air.

How to clean your Jeep Grand Cherokee engine?

It is recommended to wash your engine when the weather is favorable. It has to be warm but not too hot, without rain or wind. The best time to do engine cleaning is after the winter. During this period, much dirt is collected on and under the engine, which requires cleaning.

Warm up your engine

Before the operation, a light engine warm-up is required; it will make dirt removal easier.

Important: You shouldn't wash the engine when it reaches its working temperature - 100 degrees - that's too much. If the cold water hits a hot surface, it may damage the engine or its components.

Don't wash the engine if you've been on a long journey in your Grand Cherokee recently. Let it cool down for one and a half hours.

The best option is to start the engine when it's “cold” and wait until it warms up to 60-65 degrees, then turn it off and leave for 15 minutes. In this case, the engine of your Jeep Grand Cherokee will reach its optimal temperature for cleaning.

Disconnect the negative battery terminal

First, you need to disconnect the negative terminal from the car battery. In this way, you will de-energize the entire electrical system of the car, and if water gets on some electrical components, there won't be a short circuit.

It is best to completely remove the battery from the car after disconnecting both terminals. 

If you encounter any issues where disconnecting the negative terminal is not readily available as a design feature in newer vehicles, the primary step to take is to disconnect the negative terminal.

Manually remove large debris from the engine compartment

Often, a lot of dirt and debris, like tree fluff, leaves, or grass, accumulates under the hood. Before starting the cleanup process, one should remove these contaminants. Usually, they are collected in tiny gaps in an engine bay or can be found closer to the interior. Inspecting every one of these places carefully and removing any sign of dirt is important.

Cover up all electronic contacts

Electronic equipment, sensors, and wires are the most susceptible to water. The water can still harm the vehicle even though the system will be de-energized while washing.

Contacts may become oxidized without proper attention, and electrical equipment may become out of order. The worst thing is that the oxidation may happen not at once but after a while when the reaction passes. Your car may not start in a moment, and you won't even know the reason.

Before beginning the engine wash, one should protect every electrical contact that is under the hood, which can get wet. Among them:
Sensors (pay extra attention to them);

• Wires;
• Headlight contacts;
• Fuse block under the hood;
• Any electronic contacts which can be spotted under the hood

Two proven methods can protect the contacts mentioned above:

• Apply a special spray that protects contacts from getting wet;
• Wrap contacts with polyethylene bags or film covered with duct tape to prevent water from getting on them.

We advise you to use both of these methods. The first is to apply a special spray to protect contacts from getting wet. It creates a small protective layer, “preserving the contact,” while preventing water from getting to it. Then one has to wrap these contacts into polyethylene bags and tightly wrap them. You can use insulation tape for these purposes so the package won't fly away.
 

Shop From Amazon

Use a polyethylene bag and duct tape to wrap a fuse block. Check that all contacts are secured. If you need clarification, check your Jeep Grand Cherokee's wiring diagram.

You must also isolate other vehicle components to prevent water from getting there. Check if any holes in the air supply system exist and whether water can get through them.

If the car is equipped with a carburetor, wrap it with a bag so that water does not get into it - water entering the power system can cause the engine to malfunction.

Apply the degreaser or car shampoo to your Jeep Grand Cherokee engine surface

Apply the washing agent to the engine surface. Make sure that every spot is covered in cleaning shampoo or degreaser. There is no necessity to use it a great deal.

Shop From Amazon

Let cleaners perform their task

After cleaners are applied to the engine surface, let them come into contact with the dirt and contaminants and do their job. Leave it for 3-6 minutes.

Proceed to manual engine cleaning

After some time passes, it's time to move on to a manual cleaning procedure. Depending on the type and degree of dirtiness, take a brush or rag, and start to clean your Jeep Grand Cherokee's engine.

Shop From Amazon

Be attentive and careful to prevent any breaks or unpleasant damage. Also, remember that the exhaust manifold can still be hot, so be careful not to burn yourself.

If you find some contamination challenging to clean, resort to WD-40. This tool has a wide spectrum of applications, including cleaning parts from rust and ingrained dirt. Simply apply WD-40 to the contamination, let it do its job for a while, and then start to rub.

Rinse your Jeep Grand Cherokee's engine

After the manual cleaning of the engine is completed, you can proceed to the final stage of the final washing of the engine with water.

To do this, one has to apply the minimum possible water pressure (if you use a high-pressurized washer), so as not to damage the engine bay.

Wash carefully but thoroughly to remove all the chemicals from every spot. Don't let cleaners remain on the engine surface - it may cause stains.

Shop From Amazon

Blow out all electrical contacts with compressed air

No matter how well you protect your engine's electronics from water, nothing is 100% guaranteed.

To protect the contacts from corrosion and yourself from trouble, after unpacking the electrical elements from the packages, they must be additionally blown with compressed air - so that even if some drops of water fall on the contacts - the action of high-pressure air blows them out.

Dry the engine and its components thoroughly

When the washing process is done, be sure to dry the motor. Use paper towels or dry rags.

Thoroughly wipe all places in the engine compartment. If water gets on the electrical contacts, dry them.

Now, remove the protection from plastic bags and duct tape. Inspect every place in the engine bay carefully to be sure it's dry and clean.

After connecting the battery terminals, start the Jeep Grand Cherokee. Make sure it works correctly.

Shop From Amazon

Can I clean the Jeep Grand Cherokee engine at a car wash?

Often, washing at a car wash causes concern for many Jeep owners, especially newbies. A strong jet of water and chemicals is good for the body and other elements where there is no risk of disconnecting contacts, pipes, or clogging technical holes and gaps.

This method seems ineffective or even harmful for the space under the hood. The problem is that it is necessary to process hard-to-reach places without causing short circuits, flooding the air filter, displacement of sensors, nozzles, etc.

In practice, it can be difficult to wash your Jeep Grand Cherokee engine yourself at a self-service car wash, where only one tool is available.

Professional detailing centers are ready to offer separate services aimed at thorough or superficial processing of the space under the hood. At the same time, everything is more complex here too. The quality of washing will depend on the technology, equipment, and chemicals.

Options for washing Jeep Grand Cherokee’s engine at a car wash

The described options for washing the engine at a car wash can be called conditional since each company names them differently, but the result will be the same:

Surface wash. This method is similar to a regular car wash. The mechanic opens the hood, covers the area with a foam solution, and then flushes it with water according to the technology. The result is only the appearance of purity.

Thorough washing. This option stands out for its long preparation time and high processing quality. The cost of the service may be equal to or even more expensive than washing the body.

All surfaces are carefully processed; dirt is removed from hard-to-reach areas, sometimes even with hands, using sponges, rags, and brushes.

"Interfering" parts are preliminarily dismantled. Upon completion, the engine compartment becomes factory clean.

To Sum Everything Up

Engine washing may seem unimportant, but it is not true. Removing and washing out any dirt, dust, grease, and debris from the engine surface and its components is a crucial aspect of proper Jeep Grand Cherokee maintenance.

Before washing procedures, it's important to secure any vulnerable components, such as wiring, contacts, and the fuse box, to prevent water and chemicals from getting on them. 

Correct and diligent engine bay washing procedures contribute to better cooling, prevent corrosion of the components, and ensure that everything under the hood is properly cleaned and remains in fine condition, boosting the longevity and optimal performance of the Jeep Grand Cherokee.