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Discussion Starter · #1 ·
I have a 2017 Jeep Cherokee Latitude with 36,000 miles. Around 35K miles, I began to notice that my vehicle was driving a little rough and my MPG was low (15-16 MPG). I started with the obvious things - oil change and new filters. The rough idle remained, so I checked the spark plugs. The spark plugs were fouled so I had them replaced. The rough idle remained, so I made an appointment at my local dealership. They replaced all 4 ignition coil boots and updated the PCM and TCM (I believe this was their solution to the service shifter issue). On the way home, the vehicle was still running rough at idle. I gave it some time while I waited for my radio to be delivered (it had an internal error and had to be replaced). During this time, the vehicle began to randomly stall in the mornings and the rough idle was more apparent. I took it back a second time and the dealership diagnosed this as a bad fuel pump. The fuel pump was replaced but the rough idle could not be replicated according to the technician. A little over 1,000 miles later, my vehicle is still running rough on idle. Sometimes the problem is very subtle, other times it feels like I'm driving a tractor. My engine also sputters in the mornings when I first turn the vehicle on. This past week, I began to notice that my coolant temperature was increasing well past 230F. It has not set off any warning lights or messages, but has gone up to 247F. The coolant was topped off less than 1,000 miles ago, but it was well below the minimum yesterday. I topped it off to the max and it appears to have gone down to minimum in less than 24 hours. Could this all be related or am I dealing with separate issues? The service advisor at my local dealership thinks I'm crazy. Even the manager has brushed me off and has become non-responsive. Had I not purchased a MaxCare plan, I would've been dealing with some pretty expensive repairs. I joined this community in hopes of getting some advice on dealing with he dealership.
 

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Discussion Starter · #8 · (Edited)
It could be an EVAP system issue. There was just someone else with similar issues, and it turned out to be a bad gas cap. The one thing that you don't want to do on our Cherokees is round up to the next dollar during a fillup. When the pump clicks off, it's full...馃槑
Part of the notes from the last visit: "found liquid in the evaporative system, cleaned fluid and replaced fuel pump and vapor canister"

Now that I've read the STAR publication, it appears that the root cause of liquid fuel in the EVAP system is currently being investigated/verified by FCA. This was just a temporary fix.
 

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Discussion Starter · #11 ·
It's amazing that when all of this is going on and no CEL's! I have the 2.4L with just under 48,000 miles and have not experienced anything like you've mentioned.

The EVAP suggestion could really be a good one. I've had my TH for seven years and the coolant level is good. Have you tried to watch for any leaking when the engine is running at idle?
It鈥檚 so strange to me that I haven鈥檛 gotten a check engine light or any other warning. The only warning message that has come up has been a low tire pressure warning message. I was on the freeway and it said my tire pressure was at 8 psi. It smelled like something was burning. I pulled over and manually checked my tire pressure. It was fine and the message cleared after restarting the vehicle.

I haven鈥檛 checked for leaks when the vehicle is running at idle but thank you for suggesting this. This will be my next thing to check.
 

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Discussion Starter · #12 ·
The loss of coolant and the overheating would have me looking at the internals of the engine and doing a compression test. You could very well have a leaking head gasket causing the engine to run like crap along with loss of coolant and overheating. You do not always have white smoke out the exhaust with a head gasket leak. My friend has a Chrysler 200 with the 2.4 as well and his head gasket was leaking. No past overheating to cause it to fail. Just one day starting running bad and coolant was disappearing.
I spoke to a new service advisor, who said it sounds like a problem with the head gasket. I'm taking it in tomorrow but it'll take about a week to diagnose. I was informed that they can no longer offer a goodwill rental since I just hit the end of my basic warranty. I hit 36,000 miles over the weekend while I waited for my appointment date. 馃檮 I'm not sure if it will help but I filed a complaint with Jeep Customer Care.
 

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Discussion Starter · #16 ·
Thanks, everyone! I will definitely be pushing back and reminding them that this should be covered under the powertrain warranty. I was told to expect a call from their manager this afternoon, but of course that didn't happen.
 

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Discussion Starter · #23 ·
Today I was told that it could be worn engine mounts and that the bad spark plugs, ignition coils, fuel pump, vapor canister, overheating, and loss of coolant were all separate un-related issues. :rolleyes:
 

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Discussion Starter · #27 ·
Well鈥 my car was in the shop for two weeks and today I finally received notice that it was ready for pick up. I asked what the diagnosis was and I was told NOTHING. They could not find anything wrong with my vehicle. The car did not overheat while they test drove it and not one of the issues surfaced while they had the vehicle. I am livid! Thank goodness I took photos of the coolant temp. My lawyer will be sending them straight to FCA.
 

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Discussion Starter · #29 ·
You are far nicer, and more patient than I...I would have likely had to be escorted off of the property...馃槑
I don鈥檛 know what else to do at this point. Jeep Customer Care brushed me off and closed my complaint without ever speaking to me. They claim to have called me but I had zero missed calls and zero voicemails. I replied to their email asking for a number where I could reach them and they responded by closing the case.

I almost want to just let the engine overheat and die just to prove a point.
 

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Discussion Starter · #31 ·
Try PM'ing@JeepCares on here. Maybe they can help. Good luck, and keep us posted...馃槑 View attachment 219664
The repair order basically says I'm crazy. "NO REPAIR WAS PERFORMED DUE TO VEHICE BEING THE SAME AS A GOOD KNOWN VEHICLE." I guess good known vehicles regularly overheat and have an abnormal vibration that started when the spark plugs were going bad. I'm almost certain they let the vehicle sit for over a week just to shut me up. It was covered in dirt, had a thick layer of debris from a flowering tree, and a huge spiderweb on the side mirror.
 

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Discussion Starter · #37 ·
Gotcha. Normal could be anywhere in those ranges depending on what you're doing.

Personally, my 3.2L stays at 195 while on the highway. Stop and go will get up to about 223-225 before the fans cool it back down. I don't think I've ever seen anything higher than that.
Mine consistently runs 220-230 and has gone up to 247. I recently drove a Cherokee as a rental and it never went over 200. Dealership says my temps and the loss of coolant are normal.
 

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Discussion Starter · #39 ·
Back in Post #1 you topped up the coolant. About how much? A lot would suggest a leak somewhere.
What kind of coolant did you use? Anything other than the correct Mopar 50/50 coolant is not correct.
The coolant cap pressure release can be tested but it is probably just easier to buy a new one.
Make sure the cooling fans come on when they should, more or less.
Generally I use the air conditioning whether I need it or not because it causes both radiator fans to operate continuously.
One of the modules controls the fan speed, not sure which one. Ok, ECU in above Post.
Make sure the radiator fins are not blocked, mud, bugs, bent fins, plastic bag, etc.
Make sure the serpentine belt is ok and not glazed so that it can turn the coolant pump without slipping.
That's about all I can think of for now.
When I topped off the coolant is was below the minimum line (back in post #1). It had just been topped off two months prior during an oil change. A few days after I topped it off, it had lost about 1/4 of the coolant I had added. When I picked up the vehicle from the dealership yesterday, it was back near max. They might've topped it off again. I did not buy the Mopar coolant since I was not near a dealership at the time. I bought a PEAK OET antifreeze and coolant for North American vehicles. 50/50 OAT prediluted for use in Chrysler/FCA vehicles 2013 and up.
 
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