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Pontiac Forum: Unknown coolant leak on passenger side (not water pump)
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Old October 16th, 2016, 01:23 PM
Dope Dope is offline
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Unknown coolant leak on passenger side (not water pump)

Hi guys,

The car in question is a 2007 G6 SE sedan with the 3.5L V6. About 50k miles.

I have a mysterious coolant leak on the passenger side of the motor. I had this happen last year and it was the water pump gasket which I replaced. I just replaced it again yesterday, thinking it was the same problem but the old gasket was perfect. Upon further inspection I can see coolant on the passenger side of the motor, on the rear corner of the motor just under the rearward-facing head. It's just opposite the strut tower and just under the alternator. Here are two similar pictures, you can see how the black plastic bracket thing is all wet. There is coolant under this part as well but nothing really above it.

I can't see this area too well, any idea where it would be leaking from? I was thinking maybe a head gasket but I've got no oil/coolant mixing from what I can see. Never heard of a head gasket leaking externally only. Maybe a freeze plug on the head somewhere? Any other ideas? I'd like to buy some parts ahead of time before I start taking the car apart.

Thanks in advance,
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Old October 16th, 2016, 06:52 PM
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melsg5 melsg5 is offline
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have you rented a pressure tester to determine the source of the leak?
1971 GTO 455 HO Ram Air
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Old October 16th, 2016, 08:38 PM
Dope Dope is offline
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I have all the leak detection equipment, the problem is I can't really see that part of the engine to locate the exact leak. That corner is on the rear passenger side and it was hard just to get that shot of the area. I'm not thinking head gasket so it pretty much has to be the coolant crossover I'm guessing? Just curious if anyone has had experience with coolant leaking in this area.

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