Leaking Coolant - Chevy and GMC Duramax Diesel Forum
04.5-05 LLY Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect

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Old 01-02-2013, 04:03 PM   eBay Motors  #1 (permalink)
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Leaking Coolant

Had low coolant warning come on today. Got out to look and check and noticed a drip in front of the passenger side front tire. First time this has happened. I went and got some coolant and added it and drove home. After I got home I got out to see if I was still leaking and it wasn't. Could still see a couple drops. I pop the hood and look, and several things around my reservoir tank had coolant on them. Figured I would wait to do the typical hard hose check but as I was getting ready to close the hood I reached and grabbed the upper radiator hose and it was not hard at all. Would this be a bad reservoir cap?


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Old 01-02-2013, 04:08 PM   eBay Motors  #2 (permalink)
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Also forgot to add, the truck didn't get hot or any swings in temp. Thanks guys.


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Old 01-02-2013, 06:50 PM   eBay Motors  #3 (permalink)
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Anyone?


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Old 01-02-2013, 07:33 PM   eBay Motors  #4 (permalink)
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did u let it idle for a while and see if there was any bubbling occurring in the reservoir?
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Old 01-02-2013, 08:11 PM   eBay Motors  #5 (permalink)
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I think that you should start with cleaning as much old coolant off and then pressure test the system, including the cap. I have seen the tanks leak at the seem and the caps leak.
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Old 01-02-2013, 08:13 PM   eBay Motors  #6 (permalink)
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Quote:
Originally Posted by NEDuramax View Post
did u let it idle for a while and see if there was any bubbling occurring in the reservoir?
By the time I got off work and got done feeding I was ready to get inside and warm up. I just found it weird that my upper radiator hose was not hard. Even after checking it less than a minute after it was turned off


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Old 01-02-2013, 08:14 PM   eBay Motors  #7 (permalink)
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Quote:
Originally Posted by dave.chretien View Post
I think that you should start with cleaning as much old coolant off and then pressure test the system, including the cap. I have seen the tanks leak at the seem and the caps leak.
I'm still a noob so how would I go about pressure testing the system and the cap?


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Old 01-02-2013, 08:16 PM   eBay Motors  #8 (permalink)
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Quote:
Originally Posted by yfzgoody View Post
By the time I got off work and got done feeding I was ready to get inside and warm up. I just found it weird that my upper radiator hose was not hard. Even after checking it less than a minute after it was turned off


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check the hose when its cold
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Old 01-02-2013, 08:19 PM   eBay Motors  #9 (permalink)
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Quote:
Originally Posted by yfzgoody View Post
I'm still a noob so how would I go about pressure testing the system and the cap?


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You will need a cooling system pressure tester and cap adapter.
you can get these at harbor freight or a tool store. I have one from snap on and one from harbor freight. either works fine
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Old 01-02-2013, 08:22 PM   eBay Motors  #10 (permalink)
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What psi should the system hold? And for how long?


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