Coolant Leak

[fliprayzin240sx]

K, I'm kinda stumped on this. I got a leak somewhere and it kinda got me stumped. This is on an RB25 engine with a PBM swirl pot. When the engine is cold, I got a leak thats bad enough that would dump half the coolant out of my swirl pot. The radiator stays the full so I was thinking it has to be on the pot. Took the pot out, pressurized it under water, no leak. Checked the lines, didnt see anything that looks like a leak. I have no puddle or anything under the car, I'm not burning coolant, not overheating, but after driving it to work and back (roughly 10 miles), rad would be low about a qt.

Checked around the engine bay with the engine hot, figured I'd hear the leak hissing out but nothing. I got pressure on the radiator cap.

Any idea or suggestions?

[godsmack]

Heater core maybe.

[fliprayzin240sx]

I thought that but figured I'd have a damn puddle inside the cabin. Everything is dry, not leaking on the heater core lines insde the engine bay either.

[Sileighty_85]

Does a puddle form or does it disappear?

[fliprayzin240sx]

Does a puddle form or does it disappear?

No puddle under the car, inside the car but I lose it fast enough that the swirl pot would be half empty in a couple of hours.

I'm gonna rip off the intake manifold tomorrow, figured I'll check all the lines under the Greddy Manifold.

[cotbu]

Coolant to water ratio, could you be running hotter than usual? And just be burning through coolant, not actually burning coolant, and if the swirl pot is the expansion tank it would make sense that the radiator retains it's water level.

It would be pretty hard to miss a leak with a fully bled system, even a pin hole would reveal itself under pressure. Fill the system back up and add a few psi to the hose connected to the filler neck, radiator or swirl pot. Abracadabra!

[fliprayzin240sx]

Welps, found the leak. I got a pin hole on one of the coolant line at the back of the engine. The main one going back into the block is leaking. It started pissing coolant after the car was hot but no leak when the engine is cold. I wasnt seeing a puddle because its dripping on the block and its dripping all the way down the tranny.

[2tonecoupegrl]

So the leak was caused by pressure? Glad you figured the issue out!

[ultimateirving]

Welps, found the leak. I got a pin hole on one of the coolant line at the back of the engine. The main one going back into the block is leaking. It started pissing coolant after the car was hot but no leak when the engine is cold. I wasnt seeing a puddle because its dripping on the block and its dripping all the way down the tranny.

I was gonna post something along those lines. Found out I had a leak from my Turbo coolant line. Dripping down my trans near the center of the car. Damn phantom leaks.

[shiftdrift]

same thing happened to me, it would leak on the block and evaporate and i could never see it

[smoked240]

Was it the 45 bent hose going to the block? Cause that's exactly where mine leaked and it was a bitch to replace without pulling the intake. Was a pinhole too.