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post #1 of 7 (permalink) Old 08-16-2012, 08:02 AM Thread Starter
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Question Strange Overheating Problem

So she's a 2006 300C
Never had any issues with her and only done regular maintenance (brakes, tires, oil change, etc.)
She's at exactly 99,911 miles as of driving to work this morning.
I've had her since she was new.

About a year ago (fall 2011) she started to randomly overheat.
Didn't matter if I was driving down the road at 80 or sitting in traffic.
The temporary solution was to shift to neutral and floor it. She would rev-limit at 4K and after a few seconds (2-4) she would drop the temp back down.
let off the gas and she ran fine for a while. sometimes just minutes other times days.
I figured it was thermostat so I had that replaced... She ran good for about a month or so then started overheating again.
Do the mechanic recommended another thermostat in case I got a bad one.
We replaced it again and same thing... ran good for a month then started up again. Still she would get hot on occasion (we're talking a few times a week, give or take).
So I had them pull the thermostat and leave it out (summer time).
She did it again after a couple weeks... now we know what it's NOT!
I then bought and replaced the water pump and thermostat with Mopar parts from dealership (I bought them myself).
Dumped all coolant and poured new in it. We watched her run for a while and push all the bubbles out into the overflow and topped her off.
She ran good for two+ months.
This morning... SAME THING!
I did the 3x key turn and no codes come up. No check engine light... nothing.

Ideas?
It's about time for a good tune up anyways so I figured if I'm going to have any major work done it's the best situation if ever there was one.

My friend recommended to have them look into a blown head gasket.

It's not just you, I look down on everybody.
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post #2 of 7 (permalink) Old 08-16-2012, 10:26 AM
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It's weird that you aren't seeing any codes. They gotta be there, somewhere.

Have you run a pressure test on the cooling system?

Before thinking head gasket - you might want to find a good service dept with a good electronics tech to plug in the StarScan and get a diagnosis . . .

Hopefully - others with far better tech knowledge than me will chime in here.

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post #3 of 7 (permalink) Old 08-16-2012, 10:32 AM
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Are your fans running?maybe a bad sensore and your high speed isn't kicking on all the time.

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post #4 of 7 (permalink) Old 08-16-2012, 10:57 AM
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The powertrain control module (PCM) has been programmed to monitor certain cooling system components:

If the engine has remained cool for too long a period, such as with a stuck open thermostat, a Diagnostic Trouble Code (DTC) can be set.

If an open or shorted condition has developed in the relay circuit controlling the electric radiator fan, a Diagnostic Trouble Code (DTC) can be set.

If the problem is sensed in a monitored circuit often enough to indicated an actual problem, a DTC is stored. The DTC will be stored in the PCM memory for eventual display to the service technician.

It really could be a whole host of different things that can cause a high temp reading. Some things to check for:
Is the temperature gauge reading correctly?
Is the temperature warning illuminating unnecessarily?
Coolant low in coolant reserve/overflow tank and radiator? Check for coolant leaks and repair as necessary.
Pressure cap not installed tightly. If cap is loose, boiling point of coolant will be lowered.
Poor seals at the radiator cap. Check condition of cap and cap seals. Replace cap if necessary.
Check condition of radiator filler neck or degas bottle. If neck is bent or damaged, replace radiator or degas bottle.
Coolant level low in radiator but not in coolant reserve/overflow tank. This means the radiator is not drawing coolant from the coolant reserve/overflow tank as the engine cools. Check condition of radiator cap and cap seals.
Check condition of radiator filler neck. If neck is bent or damaged, replace radiator.
Check condition of the hose from the radiator to the coolant tank. It should fit tight at both ends without any kinks or tears. Replace hose if necessary.
Check coolant reserve/overflow tank and tanks hoses for blockage.
Incorrect coolant concentration?
Coolant not flowing through system. Check for coolant flow at radiator filler neck with some coolant removed, engine warm and thermostat open. Coolant should be observed flowing through radiator. If flow is not observed, determine area of obstruction and repair as necessary.
Radiator or A/C condenser fins are dirty or clogged. Remove insects and debris.
Radiator core is corroded or plugged. Have radiator re-cored or replaced.
Dragging brakes. Check and correct as necessary.
Fuel or ignition system problems.
Bug screen or cardboard is reducing airflow. Remove bug screen or cardboard.
Thermostat partially or completely shut. Check thermostat operation and replace as necessary.
Cooling fan(s) not operating properly. Check cooling fan drive operation.
Cylinder head gasket leaking. Check for cylinder head gasket leaks.
Heater core failure.

Good luck on getting this issue resolved!
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post #5 of 7 (permalink) Old 08-16-2012, 12:45 PM Thread Starter
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I am shying away from it being a thermostat issue. We removed the thermostat for a few months during this summer and she did it even then. So I thought it might be the pump going bad and that's when I replace the pump and thermostat (Both with brand new Mopar parts from dealership).
The overflow seems to be doing it's job and there doesn't seem to be any blockage there. It's so sporadic and inconsistent that I'm thinking it almost MUST be electrical or a sensor.
Tonight I'm going to pop the hood and verify that both fans are turning and they kick on appropriately.
after that then I'm thinking temp sensor ($30 part and easily replaced) might be my best bet to start with if the fans appear to be working properly.
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post #6 of 7 (permalink) Old 08-16-2012, 07:32 PM
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That ^^^^ sounds like a good plan. I wonder why the dealer didn't test the sensor? Or maybe no result could be given as its so random. I'd check the wiring harness and plug at the sensor as well.

Michael
2006 300C SRT8
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post #7 of 7 (permalink) Old 06-26-2016, 07:18 AM
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deanoalf

Quote:
Originally Posted by Tall_Dallas View Post
I am shying away from it being a thermostat issue. We removed the thermostat for a few months during this summer and she did it even then. So I thought it might be the pump going bad and that's when I replace the pump and thermostat (Both with brand new Mopar parts from dealership).
The overflow seems to be doing it's job and there doesn't seem to be any blockage there. It's so sporadic and inconsistent that I'm thinking it almost MUST be electrical or a sensor.
Tonight I'm going to pop the hood and verify that both fans are turning and they kick on appropriately.
after that then I'm thinking temp sensor ($30 part and easily replaced) might be my best bet to start with if the fans appear to be working properly.
could you smell coolant when the car was reading it was hot
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