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Old 03-28-2016, 08:58 PM
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Coolant is leaking but don't know where.

I bought my 2000 2.5 5 speed TJ (128,000 miles) about a month ago, the family I bought it from owned it since new and I drove it home 2 hours without any problems at all. A couple days ago, I checked the coolant for the first time since I had owned it, it was low, I topped off the radiator (which is brand new from the previous owner) burped it through the cooling system and went on and it was fine. Checked it in the morning, it was low again, topped it off and went on... so I checked it about an hour ago and it was low again. I ruled out a head gasket because it runs like new, there is no white smoke from the exhaust, I don't smell any coolant when i'm driving and when I changed the oil about 200 miles ago the oil didn't have any weird discoloration or foaminess to it. So unless something serious happened to it the past 200 miles, I don't know what it could be. Please help me out. I will continue to keep an eye on it as well.

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Old 03-28-2016, 09:21 PM   #2
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A great tool for finding the leak is a radiator pressure tester. Some auto parts stores have them in their loaner tool inventory.

https://www.youtube.com/watch?v=96aQ5DD5y78

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Old 03-28-2016, 09:24 PM   #3
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Scan your motor with a bright flash light and check carefully around the waterpump & thermostat for any signs of coolant.
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Old 03-28-2016, 09:47 PM   #4
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A black light & your eyeballs are 2 good tools, you'll find it eventually.
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Old 03-28-2016, 09:51 PM   #5
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Antifreeze shows up
Under a ultraviolet light
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Old 03-29-2016, 07:48 AM   #6
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Freeze plug(s) may be compromised.
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Old 03-29-2016, 09:57 AM   #7
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Sometimes this fix is as simple as a new radiator cap, if you can eliminate the leak issue stemming from anywhere else on the engine / hoses / hose to attachments / water pump.

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