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Old 03-29-2015, 11:49 AM
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Coolant leaking not sure from where

I have replaced the hearted core 2 time 1st time in June of 2014 and just replaced it this week, both times puddling in passenger floor board. Replace the heater core lines in June of 2014, along with a thermostat. Replace the thermostat again shortly after because it was not opening for some reason. Replaced the water pump in January 2015 because it was leaking. Still leaking coolant no clue why, any ideas comment, helpful hints, I'm all ears. I do all my work myself on my jeep, "not a mechanic pro" but know enough to know how to handle things. Gonna be doing a pressure test this week on my jeep with a mechanic friend of mine. So any ideas will be helpful as to what I can do until then


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Old 03-29-2015, 01:02 PM
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Re: Coolant leaking not sure from where

Use a leaf blower to dry everything off. Get a bright light and search for the wet spot.
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Old 04-04-2015, 09:54 AM
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Re: Coolant leaking not sure from where

We just had one of these situations. Ours was in the lower corner. Couldnt be seen unless we took it out. Just replaced the radiator.
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Old 04-04-2015, 10:27 AM
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Re: Coolant leaking not sure from where

Dang man don't tell me that I got the pressure tester and gonna hook it up tomorrow and see if I can figure out where it's at. Hopefully not the radiator, but how much did it cost you and did you do it yourself or pay someone?


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Old 04-04-2015, 11:10 AM
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Re: Coolant leaking not sure from where

Did you see where the heater cores where leaking before? If the coolant was not changed for a long time before, galvanic corrosion will occur inside the cooling system and pin holes can form quickly at the weakest points, which normally are the heater core coolant tubes or radiator tubes. This type of corrosion works very quick and once started, its very difficult to get rid of it, even after several flushes of the whole system. An other thing which could happen is if the ground for the starter motor is bad. The high starter current will try to find its way via other, less resistant pads and can also cause the coolant tubes to cause leaks quickly.
For the first problem, you could measure with a digital volt meter between a good known ground (can be the battery negative) and the other probe inside the coolant (remove radiator cap with cold engine). The voltage should be less then 0.3V i believe. ( i will look it up tonight). This voltage difference is causing the galvanic corrosion inside the cooling system and the higher it is, the quicker the material lowest on the galvanic list will be eaten away. ( normally this is aluminum).This is a very agressive way of corrosion and mostly not seen, until its too late.
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Old 04-04-2015, 11:52 AM
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Re: Coolant leaking not sure from where

Yea the heater core was leaking just under neath the connection of the heater core lines. Everything seems to be good on the inside he system has been drained and new fluid put in right after I got it 2 years ago and then this time last year when I replaced the thermostat and the heater core then I just did it all again. I will check that out tomorrow when I check out the pressure test


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