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, Etc.

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post #1 of 26 (permalink) Old 01-02-2013, 05:03 PM Thread Starter
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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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post #2 of 26 (permalink) Old 01-02-2013, 05:08 PM Thread Starter
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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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post #3 of 26 (permalink) Old 01-02-2013, 07:50 PM Thread Starter
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Anyone?


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post #4 of 26 (permalink) Old 01-02-2013, 08:33 PM
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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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post #5 of 26 (permalink) Old 01-02-2013, 09:11 PM
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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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post #6 of 26 (permalink) Old 01-02-2013, 09:13 PM Thread Starter
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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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post #7 of 26 (permalink) Old 01-02-2013, 09:14 PM Thread Starter
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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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post #8 of 26 (permalink) Old 01-02-2013, 09:16 PM
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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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post #9 of 26 (permalink) Old 01-02-2013, 09:19 PM
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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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post #10 of 26 (permalink) Old 01-02-2013, 09:22 PM Thread Starter
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What psi should the system hold? And for how long?


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