Dorman’s Jeep 36 oil cooler assembly replaces a known weak point in the 3.6-liter Pentastar engine, preventing coolant and oil mixing. If you own a Jeep with the 3.6L engine, you likely know about the oil cooler housing problems. The Dorman Jeep 36 oil cooler is designed to fix that issue for good.
This part is a direct replacement for the factory unit. It stops the common failure where coolant leaks into the oil, or oil leaks into the coolant. Both situations can ruin your engine fast.
In this guide, we will cover everything you need to know. From why the factory part fails, to how the Dorman upgrade works, and step-by-step installation tips. You will also find a FAQ section at the end.
Why The Factory Oil Cooler Fails
The 3.6-liter Pentastar engine is a great motor overall. But it has one major design flaw. The oil cooler housing is made from plastic.
Over time, heat cycles cause the plastic to become brittle. The housing cracks. When it cracks, coolant and oil mix together.
This mixing causes serious damage. Your engine loses lubrication. The coolant system gets clogged with oil. Repair costs can be huge.
Common symptoms of a failing factory oil cooler include:
- White milky oil on the dipstick
- Coolant loss without visible leaks
- Overheating engine
- Oil in the coolant reservoir
- Check engine light with codes related to coolant temp
Most factory units fail between 60,000 and 100,000 miles. Some fail even sooner. If you have not replaced yours yet, it is a matter of time.
Dorman Jeep 36 Oil Cooler
The Dorman Jeep 36 oil cooler is an aftermarket upgrade. It replaces the weak plastic housing with a stronger aluminum unit. This is the main reason people choose it over the factory part.
Dorman designed this part to be a direct bolt-on replacement. You do not need any special tools or modifications. It fits exactly like the original.
The aluminum construction does not crack like plastic. It handles heat better. It also seals more reliably. This means you will not have to worry about coolant and oil mixing again.
Dorman part numbers for this cooler include 926-959 and 926-960. Check your vehicle fitment before ordering. Most 2011-2020 Jeep Wrangler, Grand Cherokee, and other models with the 3.6L engine use this part.
Benefits Of The Dorman Upgrade
Switching to the Dorman unit gives you several clear advantages. Here are the main ones:
- Aluminum housing instead of plastic
- No more cracking from heat cycles
- Better gasket design for sealing
- Direct fit, no modifications needed
- Often cheaper than the dealer part
- Comes with all necessary gaskets and seals
Many Jeep owners report that the Dorman cooler solves the problem permanently. Once installed, you can forget about oil cooler failures.
How It Compares To The Factory Part
The factory oil cooler is made by Mopar. It is plastic. It costs around $150 to $250 at the dealer. The Dorman unit is aluminum and costs about the same or less.
Installation is identical for both parts. The only difference is the material. Plastic will eventually fail. Aluminum will not.
Some people worry about aluminum expanding and contracting differently. Dorman has engineered the unit to match the thermal properties of the engine. It works perfectly.
In our opinion, the Dorman unit is the better choice. It is a simple upgrade that prevents a major failure.
Tools And Parts Needed For Installation
Before you start, gather everything you need. This job is doable at home if you have basic mechanical skills. It takes about 2 to 4 hours.
You will need:
- Dorman Jeep 36 oil cooler assembly
- New coolant (OAT or HOAT type, check your manual)
- New engine oil and filter
- Socket set with extensions
- Torque wrench
- Pliers
- Drain pan
- Shop towels
- Safety glasses and gloves
Some people also replace the thermostat and housing at the same time. This is optional but recommended. The thermostat housing is also plastic and can fail.
Make sure you have the correct Dorman part for your vehicle. Double check the year, model, and engine size. The 3.6L Pentastar is common, but there are variations.
Step-By-Step Installation Guide
Follow these steps carefully. Take your time. Rushing can cause mistakes.
- Disconnect the negative battery terminal. Safety first.
- Drain the coolant from the radiator. Use the drain valve or remove the lower hose.
- Remove the air intake tube and engine cover. This gives you access to the top of the engine.
- Disconnect the coolant hoses from the oil cooler housing. Be prepared for some coolant spillage.
- Remove the electrical connectors from the oil pressure sensor and other sensors on the housing.
- Unbolt the oil cooler housing from the engine. There are usually three bolts. Use a socket with an extension.
- Carefully pull the old housing out. It may be stuck. Wiggle it gently.
- Clean the mounting surface on the engine. Remove any old gasket material or debris.
- Install the new Dorman oil cooler. Use the supplied gaskets. Do not overtighten the bolts. Torque to spec: usually 89 inch-pounds or 10 Nm.
- Reconnect the coolant hoses and electrical connectors.
- Reinstall the air intake tube and engine cover.
- Fill the cooling system with fresh coolant. Bleed the air out. Follow your vehicle’s procedure.
- Change the engine oil and filter. This is critical because old oil may be contaminated.
- Reconnect the battery. Start the engine. Check for leaks.
- Let the engine warm up. Check coolant level again. Top off if needed.
That is the basic process. Some vehicles have slight differences. Consult a service manual for your specific model.
Common Mistakes To Avoid
Here are some pitfalls people run into. Avoid them to save time and frustration.
- Not draining the coolant first. This makes a huge mess.
- Forgetting to change the oil. Contaminated oil will damage your engine.
- Overtightening the bolts. Aluminum threads can strip easily.
- Not bleeding the cooling system. Air pockets cause overheating.
- Using the wrong coolant type. Mixing coolant types can cause gel formation.
If you are not confident, take it to a shop. The labor cost is worth the peace of mind.
Cost Analysis: Dorman Vs. Dealer
Let us talk about money. The Dorman Jeep 36 oil cooler typically costs between $100 and $180 online. The dealer part is often $200 to $300.
Labor costs vary. A shop might charge $200 to $400 for installation. Doing it yourself saves that money.
Total cost for a DIY job is around $150 to $250 including fluids. A shop job is $400 to $700.
Considering the Dorman part is better quality, it is a no-brainer. You save money and get a better product.
Where To Buy The Dorman Cooler
You can find the Dorman cooler at many auto parts stores. Online retailers like Amazon, RockAuto, and Summit Racing also carry it.
Check the seller’s return policy. Some sellers have restocking fees. Make sure you get the correct part number.
Local parts stores like AutoZone or Advance Auto Parts may stock it. Call ahead to check availability.
Long-Term Reliability
How long does the Dorman cooler last? Based on owner reports, it seems to last indefinitely. The aluminum housing does not degrade like plastic.
Some people have had the Dorman unit installed for over 50,000 miles with no issues. There are no widespread failure reports.
Of course, no part is perfect. But the Dorman design addresses the root cause of the failure. That is why it is so popular.
If you maintain your cooling system properly, the Dorman cooler should outlast the engine.
Warranty Information
Dorman offers a limited lifetime warranty on many of their parts. Check the specific warranty for the oil cooler. It is usually one year or more.
Keep your receipt. Register the product on Dorman’s website if possible. This makes warranty claims easier.
Even without a warranty, the cost is low enough that replacing it is not a big deal. But you likely will not need to.
Frequently Asked Questions
Here are common questions about the Dorman Jeep 36 oil cooler. We answer them clearly.
Does the Dorman oil cooler fit all Jeep 3.6L engines?
It fits most 2011-2020 Jeep models with the 3.6L Pentastar. Check your specific vehicle fitment before buying. Some later models may have slight differences.
Can I install the Dorman cooler without draining the oil?
You should drain the oil after installation. The old oil may be contaminated. It is best to change it anyway.
How long does the installation take?
For a DIYer, expect 2 to 4 hours. A professional can do it in 1 to 2 hours.
Is the Dorman cooler better than the Mopar part?
Yes. The aluminum housing is much stronger than plastic. It will not crack from heat. It is a clear upgrade.
What if my engine already has oil and coolant mixed?
You need to flush the cooling system and change the oil multiple times. The Dorman cooler will prevent future mixing, but the existing contamination must be cleaned out.
Final Thoughts
The Dorman Jeep 36 oil cooler is a smart upgrade for any 3.6L Pentastar owner. It fixes a known weak point with a durable aluminum design. Installation is straightforward if you have basic tools.
Do not wait until your factory cooler fails. That can cause expensive engine damage. Replace it proactively with the Dorman unit.
You will save money, time, and stress. Your Jeep will run cooler and more reliably. It is one of the best preventive maintenance mods you can do.
If you have any doubts, consult a mechanic. But for most people, this is a weekend project that pays off big time.
We hope this guide helps you make the right choice. The Dorman cooler is a proven solution. Give your Jeep the protection it deserves.