1992 Nissan 300ZX Coolant Leak When Off

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HARDENSTINE
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  • 19 POSTS
1992 300zx 156,000 miles
I have a coolant leak in the back of my motor it only leak when the car is turn off I does not over heat when the car I running and the performance does not change the is not leak when the car is running but ones the car is stop the coolant come out it’s a small amount but it leak on the exhaust manifold make a lot of smoke
Feb 18, 2007 at 4:20 PM
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RASMATAZ
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[quote:175d694ab8="hardenstine"]1992 300zx 156,000 miles
I have a coolant leak in the back of my motor it only leak when the car is turn off I does not over heat when the car I running and the performance does not change the is not leak when the car is running but ones the car is stop the coolant come out it’s a small amount but it leak on the exhaust manifold make a lot of smoke[/quote:175d694ab8]

Sounds like a freeze plug.-it only leaks because the engine cools down and contracts and it opens up.
Feb 18, 2007 at 9:08 PM
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HARDENSTINE
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  • 19 POSTS
[quote:8082a7629b="rasmataz"][quote:8082a7629b="hardenstine"]1992 300zx 156,000 miles
I have a coolant leak in the back of my motor it only leak when the car is turn off I does not over heat when the car I running and the performance does not change the is not leak when the car is running but ones the car is stop the coolant come out it’s a small amount but it leak on the exhaust manifold make a lot of smoke[/quote:8082a7629b]

Sounds like a freeze plug.-it only leaks because the engine cools down and contracts and it opens up.[/quote:8082a7629b]

hade it work on turns out the was a coolent hous that had a leak in it
Nov 13, 2007 at 6:29 AM
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HARDENSTINE
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  • 19 POSTS
[quote:2bb274d3eb="hardenstine"][quote:2bb274d3eb="rasmataz"][quote:2bb274d3eb="hardenstine"]1992 300zx 156,000 miles
I have a coolant leak in the back of my motor it only leak when the car is turn off I does not over heat when the car I running and the performance does not change the is not leak when the car is running but ones the car is stop the coolant come out it’s a small amount but it leak on the exhaust manifold make a lot of smoke[/quote:2bb274d3eb]

Sounds like a freeze plug.-it only leaks because the engine cools down and contracts and it opens up.[/quote:2bb274d3eb]

hade it work on turns out the was a coolent hose that had a leak in it[/quote:2bb274d3eb]
Nov 13, 2007 at 8:23 AM

Suggested Repair

Inspect the rear coolant hose and replace it if leaking. A freeze plug was also suggested because the leak appeared only as the engine cooled and contracted.

Conversation Summary

A 1992 Nissan 300ZX with 156,000 miles leaked a small amount of coolant at the back of the engine only after shutdown, dripping onto the exhaust manifold and causing smoke. It did not overheat or lose performance while running. An expert suspected a freeze plug opening as the engine cooled. After repair, the owner reported that a coolant hose was leaking.

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