1st Gen Durango 1998 - 2003 Durango's

radiator fluid boils but truck doesnt overheat

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Old Jun 14, 2011 | 09:28 AM
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From: pomano
Question radiator fluid makes boiling sound but truck doesnt overheat

good morning - have a question and just need to know if its something to be concerned about-
i just noticed recently when i turn of my 2003 dodge durango 4.7 i hear the coolant making a boilng sound but the temperature gauge is not overheating, is this normal? since i've never noticed it before i was just wondering if this is the start of something going wrong with the thermostat or the radiator itself- the coolant is not filled to the top as i know overflow would happen if it was, but now hearing that boiling noise when i turn of the truck after only a 5-7 mile ride has me a little concerned- any suggestions? or is this normal- thanks for any help guys
 

Last edited by buffalocalzone; Jun 14, 2011 at 10:18 AM. Reason: make and model
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Old Jun 14, 2011 | 10:10 AM
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No, it should not be boiling. Sounds like maybe your radiator cap is leaking / not holding pressure? You may want to consider replacing it to start with. Also make sure that your overflow reservoir has coolant in it as well.

Bob
 
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Old Jun 14, 2011 | 10:13 AM
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thanks for the reply, i didnt think it was normal- its just strange that the temperature gauge nor the truck does not overheat, i should correct that its not really "boiling" but rather making a 'boiling sound" when turned off
 
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Old Jun 14, 2011 | 10:47 AM
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That's what I figured the sound was. While it's normal for some noise (expansion / contraction of the liquid as it cools) it sounds to me that the cap is not holding pressure.

The other possibility is that you have air in the system which you get rid of by "burping" it (covered many times here, just do a search on it to get the methods) but that just opens up a whole new avenue to explore!

Start with the cap.

Bob
 
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Old Jun 14, 2011 | 11:08 AM
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It also sounds like you may have an inproper mixture of coolant to water. I'd say try adding some more coolant (maybe quarter gallon) that way it is more coolant in the ratio if anything.
 
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Old Jun 14, 2011 | 11:10 AM
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thanks bob- appreciate the advice
 
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Old Jun 14, 2011 | 11:11 AM
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thats exactly what i was going to try before i left work here- thanks
 
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Old Jun 14, 2011 | 12:46 PM
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I would drain and install 50/50 pre-mixed antifreeze.

In fact you might be better off to get the system flushed to ensure you have the right mix all the way through.
 
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Old Jun 14, 2011 | 01:45 PM
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thanks for the advice guys- greatly appreciated
 
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