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2004 Chrysler 300M overheating mostly when it rains?


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SadesBlack
New User

Sep 5, 2014, 9:57 PM

Post #1 of 6 (1215 views)
2004 Chrysler 300M overheating mostly when it rains? Sign In

Hi all,
I want to first thank you for your time in helping with this problem in advance because it is driving us crazy. My boyfriend's 2004 Chrysler 300M has been overheating in total about 7-10 times in the past 2 months with most of those times being while its raining or after it rains. It is not often rainy in the Texas panhandle... When it stats to overheat, seemingly at random, temp gauge will start to edge over the midway mark (no actual #s on gauge) for a minute our two before it rapidly moves toward the red. At this point, it will sometimes drop down rapidly again to just above midway before once more shooting up toward red. It will continue into red if the car remains running. Slowing down, stopping, driving in city nor on highway seems to make any difference. The radiator is clean and water/coolant seems to circulate fine and the fans work. He had the thermostat, radiator cap and (just the other day) the water pump replaced. We thought the new water pump fixed the problem until the car overheated on our way home tonight. It started raining early am and has continued into the night. We did do some driving around while it was raining this afternoon with no problems. From researching, many suggest checking if the belt on the water pump is loose or if a fuse is blown, which we will do tomorrow. Does anyone have any other advice for this issue? Please feel free to ask any questions. Again, thank you so much for your help and time!


Hammer Time
Ultimate Carjunky / Moderator
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Sep 6, 2014, 4:05 AM

Post #2 of 6 (1206 views)
Re: 2004 Chrysler 300M overheating mostly when it rains? Sign In

When this overheats, is it subsequently low on coolant?

Is this overheating at lower speed, traffic situations or morat highway speeds?



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Discretesignals
Ultimate Carjunky / Moderator
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Sep 6, 2014, 7:30 AM

Post #3 of 6 (1204 views)
Re: 2004 Chrysler 300M overheating mostly when it rains? Sign In

I would hook a scan tool up and monitor ECT voltage/temperature PID and watch the gauge to see if they agree with each other.





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on Sep 6, 2014, 7:35 AM)


SadesBlack
New User

Sep 6, 2014, 11:07 AM

Post #4 of 6 (1195 views)
Re: 2004 Chrysler 300M overheating mostly when it rains? Sign In

Thank you for such quick replies! He checks the coolant level frequently and it stays full (except the two tines it overheated badly) without leaking. He has even tried a few different brands of coolant. I'm pretty sure a family friends has a scan tool and we can try that as soon as possible. Thanks again!


kev2
Veteran
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Sep 6, 2014, 1:06 PM

Post #5 of 6 (1186 views)
Re: 2004 Chrysler 300M overheating mostly when it rains? Sign In

scan for codes even if CEL is OFF.

Check that engine cooling fans come on when A/C or defroster are selected...


Tom Greenleaf
Ultimate Carjunky / Moderator
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Sep 6, 2014, 1:11 PM

Post #6 of 6 (1186 views)
Re: 2004 Chrysler 300M overheating mostly when it rains? Sign In

Just a note on coolant as we call it: Don't overdo it meaning not too strong as the name is misleading. Too strong doesn't cool engine well! Mix of 50/50 should show freeze protection of -34F. If using strong mix or antifreeze/coolant pure it will not cool properly! I don't know why a rain matters and actually would think that would help cooling system?


The overheats in it's history is a reason to pay attention now. Cars don't just overheat for no reason or consume coolant mix. If it does either there's a real problem to find and fix. Brand name products I'm not convinced matter so much as long as it states meets the vehicle's specifications. Base is all Ethylene Glycol. Additives can be different not the base product. If your adding or changing coolant I approve of using distilled water as the mix especially if tap water qualities are unknown,
T







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