2006 Jeep Commander - Rust colored coolant empty and overheating - JeepForum.com
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post #1 of 12 Old 07-17-2021, 01:56 PM Thread Starter
duveduve
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2006 Jeep Commander - Rust colored coolant empty and overheating

2006 Jeep Commander - Just purchased in January 2021. Suddenly started overheating - here the coolant was rust colored and it was empty. Took it in to have it flushed and they said they couldn't get it to flush clear. It should be full now (can't tell because fill tank it now stained rust colored) but still overheats within 10 minutes of driving. Guy at Mobil 1 said to trade it in... really?

Not a mechanically inclined car person. What should I check for?

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post #2 of 12 Old 07-17-2021, 02:08 PM
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You should find a technician to assist with your vehicle repairs and maintenance. Choose your technician as you would any other professional be it a physician, attorney or financial advisor, talk to family, neighbors, coworkers and fellow church members for suggestions. Look for ASE certifications for technicians a good BBB rating.

You description sounds like the "mobile one" facility is not up to assisting you with your jeep needs.
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When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #3 of 12 Old 07-17-2021, 02:28 PM Thread Starter
duveduve
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I'm kind of wondering if this has happened to anyone and what the problem was or what it might be so I have some knowledge when I call another place.

The engine fan does kick on. Also today before it overheated the a/c went warm, then "check guages", and it was all the way to "H"

Thermostat?
Fan relay? (But fan kicks on)
Water pump?
Head Gasket? (please no)

Why does coolant turn rust colored and go completely empty with no visable leaks?
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post #4 of 12 Old 07-20-2021, 12:59 PM Thread Starter
duveduve
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Ok the following things have now been done:

1) New thermostat - still overheating
2) New water pump - still overheating
3) New radiator - still overheating

4) Tested for gasket issues via smoke test - was fine

What am I missing? Any ideas anyone?
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post #5 of 12 Old 07-20-2021, 01:20 PM
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what are the indications of overheat?
temp gauge only?
Coolant boils over quickly?
Are you still loosing fluid (coolant)?
which engine?

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #6 of 12 Old 07-20-2021, 01:27 PM Thread Starter
duveduve
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Temperature guage goes to Hot then "Engine Over Temp Check Guages" flashes on dash
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post #7 of 12 Old 07-20-2021, 01:29 PM Thread Starter
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No leaks were determined now after parts replacements. Shop said it is not leaking coolant now. They either felt someone had used "stop leak" at some point or saw evidence of such, not sure which. It was a lot of rambling information after all the work was completed.
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post #8 of 12 Old 07-20-2021, 02:16 PM
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Is the engine reaching overheat quickly, could there be a gauge issue?
You have not mentioned which engine.

Did you use a OEM thermostat ? Again which engine.

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #9 of 12 Old 07-20-2021, 05:41 PM Thread Starter
duveduve
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3.7 liter

Reaches high temp after 20 total minutes (idle time for a bit plus short drive)

No idea on thermostat - it was at Meineke. It says 195f/91c thermostat
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post #10 of 12 Old 07-21-2021, 07:50 PM
retrvrtrainer
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Garage
I have had similar problems with my XJ. I had to replace the radiator to correct it. Do you know if the hoses were replaced as well? Is there still rust? May be a good time to change the oil and see what it looks like.

Matt 7:7-11
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post #11 of 12 Old 07-22-2021, 09:11 AM Thread Starter
duveduve
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Oil was changed. Still some rust color to antifreeze. Burped the radiator at an incline for an hour yesterday and it never once overheated at idle while it was burped. Took it for a drive later and overheated within 5 minutes. Oil looks great, not milky.

Oil change done
Thermostat done
Radiator replaced done
Top hose to Radiator was replaced done
Burped radiator for an hour done

Fan kicks on appropriately when at idle. Honestly no idea if it comes on when driving (obviously).

None of this makes sense. The engine is super quiet and smooth.
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post #12 of 12 Old 07-22-2021, 11:10 AM
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attaching some notes -
As you are NOT the origional owner you have NO history as to what was done. SO everything needs checking, pressure cap? correct. Belts see the notes from training, fan direction, if it can be done wrong it will.

As a last last tst I would remove thermostat seeing if system remains cool.
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When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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