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So ive been seeing a lot of 3.6 engines lately with a loss of oil or coolant yet theres no visible signs of a leak. If this sounds like you im going to show what it is and what to replace.
Ive been doing about one a week with one or both issues.
This is in a jeep but they are all done same way.
The problem is the oil cooler. Its under the intake and all you really see is the filter.
1. Remove upper intake. Unplug the electrical connections for tb and map. Theres 3 brackets that help hold the upper intake on. You only need to remove the 2- 10mm nuts on the drivers side. The bracket behind the tb has 2- 10mm nuts also. Then theres a 13mm stud that comes out to remove the bracket completely. Remove the vacuum lines. Loosen the 7- 8mm bolts in center of intake. They wont come out. Lift intake up and pull out of the 2 brackets on pass side.
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2. Cover the intake holes. I use paper towels stuffed into the holes. Remove the insulation that covers the 3 drivers side coils. Remove the electrical connections that plug into the coils and injectors. Remove the fuel line where it connects to the fuel rail. Pull the tabs that attach the harness to the valve covers. 3 on each side. Dealer had previously cut 3 on this vehicle. Try not to do that.
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3. Loosen the 8- 8mm bolts, 4 on each side that hold the lower intake down. Remove the lower intake.
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4. More paper towels into the intake holes on the heads. Now we see the oil cooler. The oil filter, oil sending unit, water temp sender are all located in it. Unplug the 2 electrical connections at the rear of the cooler. Loosen the 5 inverted torx bolts. They are E8. Lift cooler out and then remove the hose at the rear.
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Discussion Starter #5
I clean the valley at this time. Usually a lot of oil or coolant is laying in here. Clean the spots where the oil cooler fluids flow into the engine.
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Discussion Starter #6
I recommend you use a mopar oil cooler. Ive tried the ones from ebay/amazon and they dont hold up. Mopar makes 2 different coolers also. Get the wrong one and youll have problems.
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5. Use a little grease or oil on the o ring that slips into the block on the oil cooler. Put hose on the rear of the cooler. Push cooler into the block with a firm hand on the filter. Then tighten bolts to recommend torque. Install electrical connections.
 

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Discussion Starter #8
6. Leave the paper towels on the heads til you get the surfaces where the lower intake mounts clean. Keeps stuff/trash/dirt out of motor. Clean the lower intake also. Install new gaskets into the lower intake. Remove the paper towels BEFORE installing lower intake.
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Discussion Starter #10
7. Clean upper intake. Install the new upper intake gaskets into the lower intake. Connect the fuel line, put the electrical plugs back into the coils and injectors for each side. Put the insulation back onto the drivers side. Remove the paper towels from the lower intake.
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8. Install the upper intake at a slight angle with the 2 studs going into the brackets first then set the intake down the rest of the way. Tighten bolts to recommend torque from center out. Connect the hoses, bracket on rear at throttle body electrical connections.
I install a new thermostat and housing at this time also. This one was broke at time of removal.
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Seen a lot that fail and gives a code. Bleed cooling system. Drain the oil and change also. Congrats your done.
 

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Discussion Starter #12
Heres the ones ive done in 2020. 5 total so far this year also shows the difference between the 2 models.
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This is actually a well known issue. 2011-2014 I believe, and not just the 3.6L. In 2014 they changed the adapter and filter part number. BUT, the 2014s seem to be the most common. I have not seen 2015 and up, but same cooler assy, so that's weird.

What year was this recent one?

A Guy
 

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I hope I will never need this instruction but thanks for taking the time to post the pics and write it all down in a way that even I am able to understand it. ???
 

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Discussion Starter #15 (Edited)
This is actually a well known issue. 2011-2014 I believe, and not just the 3.6L. In 2014 they changed the adapter and filter part number. BUT, the 2014s seem to be the most common. I have not seen 2015 and up, but same cooler assy, so that's weird.

What year was this recent one?

A Guy
The one from pics is 2013 jeep grand Cherokee. Guy puts a lot of miles on it. Makes a trip from tampa to marco island 2x's a week. Currently has 207xxx miles.
The newest ive seen so far is 2016. It was leaking oil bad.
 
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