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Old 10-04-2019, 08:25 AM   #1
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Oil cooler install help

The oil cooler has a vent line on the top of it, what is this connected to? My 2.5 didnít have one.

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Old 10-04-2019, 08:58 AM   #2
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The oil cooler has a vent line on the top of it, what is this connected to? My 2.5 didnít have one.
As the oil cooler is the highest point in the cooling system, it tends to collect air bubbles, killing its heat transfer capabilities. Porsche figured this out after a year or so and all the later cars have a line running from that outlet to the coolant tank to allow the air to escape.
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Old 10-04-2019, 10:16 AM   #3
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Originally Posted by JFP in PA View Post
As the oil cooler is the highest point in the cooling system, it tends to collect air bubbles, killing its heat transfer capabilities. Porsche figured this out after a year or so and all the later cars have a line running from that outlet to the coolant tank to allow the air to escape.
Thanks, so since itís going onto a car that originally had a 2.5 in it Iím assuming I donít have the right port on my expansion tank. P
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Old 10-04-2019, 11:23 AM   #4
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my 99 had one. If you replaced your coolant tank, you might have one.
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Old 10-04-2019, 12:40 PM   #5
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Awesome thanks guys, I got it. Going from a 2.5 to a 2.7 is not an easy task
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Old 10-04-2019, 04:14 PM   #6
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If your original engine was a 1997, it had a tube coming from the oil pump housing on the front of the engine - metal tube that connected to a rubber hose somewhere near the right rear of the engine.



On the post-1997 cars that rubber hose connects to the top of the oil cooler (heat exchanger). If you look at the coolant tank, that hose is the top one directly under the oil filler.
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Old 10-05-2019, 02:31 AM   #7
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If your original engine was a 1997, it had a tube coming from the oil pump housing on the front of the engine - metal tube that connected to a rubber hose somewhere near the right rear of the engine.



On the post-1997 cars that rubber hose connects to the top of the oil cooler (heat exchanger). If you look at the coolant tank, that hose is the top one directly under the oil filler.
YES! Thank you this is the other thing that has been completely stumping me (my last post was this very question. So I shouldnít even need another line on my expansion tank.

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