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Discussion Starter #1
Alright looking for some help again, ran into some new heating problems again the other day and I'm not quite sure what to make of it.
Last summer I went through flushing and replacing several components on my 07 Jeep Commander with the 4.7 V8. New fluid from the dealer. Got new upper and lower hoses, t-stat, temp sensor, water pump, radiator, radiator cap, and heater core eventually all done last summer. I ended up finding out then with all that work the prior owner put stop gunk leak in the radiator and I had to chase it out. After going through the bleeding the process several times. All had been good until the other night.

While parked (family inside of car, I ran into the gas station to grab a drink) it overheated. I immediately shut it down, popped the hood and saw some bubbles in the over flow tank. I let it cool down for a bit and it was good to go. I found out my wife during that time shut off the AC. I drove it home with the ac running and it seemed to be good. Furthermore a couple months back we took it on a trip and it was fine. This was a 12 hour each way and no cooling problems. I'm curious to see your thoughts and opinions. My responses will be delayed, cannot view from work computer and no smart phone ha ha. Thanks in advance all.
 

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Hmmm.... well I'm going to go through the usual checks this weekend and see what I can find out. Going to confirm my electric fan is turning as it should ect. I forgot to add that last summer in my preparation to use my Commander for some occasional towing I added the heavy duty clutch fan as well which will help keep it running cooler. Right now I'm leaning towards a faulty temp sensor and I'm going to see that if it turns on without the AC running once it hits operating temperature and heat running. Should be fun.
 

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Just my 2 cents here;

The fact that your issue occurred when your XK was parked and you have no cooling issues on long trips while the vehicle is moving would point me towards some kind of malfunction with the fan - since the fan is the component most likely to fail that is primarily responsible for cooling airflow.

That would be my first check.
 

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I had a water pump replacement at a dealership. They forgot to plug the fan back in.

I was livid. As you may already know, turning the AC on when parked prompts the fan to kick on. So it makes sense if the fan didn't kick on due to engine temps but was on with the AC running.

I don't know what would cause that issue, though. Best of luck, and let us know what you figure out!

Edit: Looks like you know what you're doing and are on the right track. I hadn't read your second post fully.
 

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Discussion Starter #5
Just my 2 cents here;

The fact that your issue occurred when your XK was parked and you have no cooling issues on long trips while the vehicle is moving would point me towards some kind of malfunction with the fan - since the fan is the component most likely to fail that is primarily responsible for cooling airflow.

That would be my first check.
Thanks, yeah that is my thought as well. Pending no more rain here today I'm going to check the fan. I need a volt meter to as well as it just may not be running at full strength either. This was also in my mind since it is literally the only thing I have not replaced from my cooling on the Commander yet too lol. Love your Commander I could look at it all day long, still looking great.:nerd:
 

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Discussion Starter #6
I had a water pump replacement at a dealership. They forgot to plug the fan back in.

I was livid. As you may already know, turning the AC on when parked prompts the fan to kick on. So it makes sense if the fan didn't kick on due to engine temps but was on with the AC running.

I don't know what would cause that issue, though. Best of luck, and let us know what you figure out!

Edit: Looks like you know what you're doing and are on the right track. I hadn't read your second post fully.
Thanks will do. I've been a hobby mechanic my whole life so for the most part it's not a big deal. Sites like this are great as it will help a very experienced person to a less experienced person narrow down issues without a ton of cost at dealership if they have the time and ability to tackle a little DIY.
 

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Thanks, yeah that is my thought as well. Pending no more rain here today I'm going to check the fan. I need a volt meter to as well as it just may not be running at full strength either. This was also in my mind since it is literally the only thing I have not replaced from my cooling on the Commander yet too lol. Love your Commander I could look at it all day long, still looking great.:nerd:
Thanks @MarX, I appreciate it.

Keep us posted and let us know what you find.
 

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Discussion Starter #8
So I went through it in my driveway and let it run/ idle with the heater on the middle and no AC running. As it should the electric fan did not kick on as it is waiting for the signal to at temp (typically at the half mark on our gauges at least mine since it's not digital). Once it hit that gauge it started up which is good. The 4.7 flex fuel have a low and high relay for the electric fan. So I continued to wait for the high to switch on. It did a good few minutes later (which is good as well). Unfortunately the gauge still continued to climb slowly so I ended up shutting it down. Seeing and hearing the noise difference go I have no reason to think the relays are bad. The car is doing everything as it should I just think the electric fan motor is not up to the task any more. I'm probably going to go ahead and replace that unless someone else has an idea where I could have an issue? Thanks in advance.
 

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If your fan is working properly, other possible issues are the thermostat no longer fully opening or worn water pump impeller. These two are unlikely after just a year.

EDIT: You've replaced dang near everything else. If the system is properly bled and pressurizing, I wouldn't know where else to turn.
 

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If your fan is working properly, other possible issues are the thermostat no longer fully opening or worn water pump impeller. These two are unlikely after just a year.

EDIT: You've replaced dang near everything else. If the system is properly bled and pressurizing, I wouldn't know where else to turn.

Thanks yeah it's got me a little perplexed as well. This afternoon I replaced the electric fan so that job is done. Unfortunately I had to disconnect the top radiator hose so now I have to bleed the system all over again. Worse part is that will have to wait until Monday as I do not have any more coolant and have to wait for the dealer parts shop to open again. So I will not know if the fan today was the complete answer yet until probably end of next week. I did fire it back up, let it get to temp to check and make sure it kicked on which it did. It actually sounded stronger but no guarantee that means anything. Driving will be the real test. Once I bleed this thing again.
 

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Alright update here. After talking with a buddy, I realized that my issues matched the symptom of a potential t-stat failure. So when I stopped by the dealer on Monday after work to pick up more coolant, I got a t-stat as well and replaced that before starting on the bleeding process. I did bleed it on Monday and I have been driving it around the rest of the week and so far so good. My commute is not very long, in the afternoons I have been taking a longer route all through the city to push the system a bit and it has been performing as expected. I've handed the car back over to my lady as she is the primary driver of it. Wish I was lol. Thanks for the help all. - Cheers Mark
 
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