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Old 12-11-2012, 07:39 PM
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Join Date: Dec 2012
Posts: 2
Default Freeze plug coolant leak

I recently noticed that my 4.0L V6 engine was overheating and that it was a simple thermostat issue so I replaced it but found that my coolant was nearly dry. The radiator doesn't have any pinleaks (pressure tested) and all the connections were dry including the pump. I found steam pouring out from behind the A/C unit/Power steering pump bracket so I tore it apart and the front left freeze plug had corroded through allowing coolant to leak.

It's a relatively easy fix; move the power steering/ A/C unit bracket out of the way and its right there. I installed a brass plug so it would be corrosion resistant. you can see in the pics of the plug itself where the coolant had eaten at the plug. Lesson learned: have coolant changed more often!
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File Type: jpg Coolant leak.jpg (84.5 KB, 17 views)
File Type: jpg 2012-12-11 16.46.38.jpg (88.7 KB, 18 views)
File Type: jpg 2012-12-11 16.57.57.jpg (97.0 KB, 18 views)
File Type: jpg 2012-12-11 17.36.42.jpg (86.5 KB, 16 views)
File Type: jpg 2012-12-11 17.37.23.jpg (82.4 KB, 14 views)
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Old 12-11-2012, 07:54 PM
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Join Date: Dec 2011
Posts: 966
Default Re: Freeze plug coolant leak

Quote:
Originally Posted by pwcott86 View Post
I recently noticed that my 4.0L V6 engine was overheating and that it was a simple thermostat issue so I replaced it but found that my coolant was nearly dry. The radiator doesn't have any pinleaks (pressure tested) and all the connections were dry including the pump. I found steam pouring out from behind the A/C unit/Power steering pump bracket so I tore it apart and the front left freeze plug had corroded through allowing coolant to leak.

It's a relatively easy fix; move the power steering/ A/C unit bracket out of the way and its right there. I installed a brass plug so it would be corrosion resistant. you can see in the pics of the plug itself where the coolant had eaten at the plug. Lesson learned: have coolant changed more often!
Thanks for the informative posting!! Great detective work...
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