Greddy Intake Manifold Coolant Leak, advice on possible location

[Kband1]

To talk long. Heater Hoses look absolutely fine and I haven't seen a single crack from underneath or up-top when I looked at them or shook them around. The leak only happens when the car gets up to temp I.E. when coolant starts flowing and goes through the Thermostat and intake tubing (I know it's always flowing) and I am stationary. If I am moving, the leak doesn't happen at all, when the car is turned off, the leak also stops and doesn't continue at all.
 

There is no bubbling or burping or overheating or power loss or idle issues or boost loss. Could the leak be coming from the Coolant Port that runs through the Intake Manifold and a bad gasket seal? It is an OEM Gasket that...unfortunately...I have reused quite a few times. I have a new one coming this week, but I'll also be switching out the Heater hoses for a second set I have from a spare block and custom made ones to cover my tracks.

Head was recently off for a new head gasket, head and block were and are flat and surfaced, Tomei 1.2mm Head Gasket, ARP Head Studs torqued in three sequences to 80 ft/ibs per the instructions and then retorqued again after 500 miles, so recently in the last few weeks. No coolant in the Oil or any oil/coolant contamination at all.

I just dont wanna seem dumb and think it's something else than it really is and I just wanna see if anyone else has dealt with this before.

TL;DR Coolant Leak below the Intake Manifold that runs down the side of the block from looks like Coolant Port 1 and 2, Greddy Manifold. Block is an RB25. Only does it when Running and Stationary. Stops when driving and car is turned off.

[Murray_Calavera]

Would you consider using a dye and UV light to trace the leak? 

[Kband1]

5 minutes ago, Murray_Calavera said:

Would you consider using a dye and UV light to trace the leak? 

Truthfully, that didn't cross my mind. I can possibly go by the shop this week and do a quick UV Dye test and Pressure Test. It just started last night and I'm currently at work for 48 hours, so I figured I'd ask since I had time and see if anyone else has had this before.

I do have a new Intake Manifold Gasket coming, so when that comes, I can do a UV Dye thing first and if it is what I believe it is, I'll replace it then and there.

Edited March 14, 2024 by Kband1

[Duncan]

Pressure test is a good idea too, but it might still be heat related not pressure related.

[Kband1]

Quick update, I am the idiot, I did replace all my manifold gaskets, resealed the thermostat and water piping that goes under the Intake Manifold and it was slightly warped, so surfaced that a bit at home then threw it back on.

While doing that, I rechecked all heater hoses and I saw nothing, but after putting it back together, come to find out, the 75degree turned one from the Thermostat Nipple or whatever it’s called to the Heater Core return line had a super super slight tear in it that you wouldn’t even notice.

Luckily, I replace everything with turn hose clamps while it was already off, so I got it off with the intake on and cut the end off an old Heater Core Line that makes about a 70/75 turn and used that since it was apart of the return pipe section and same diameter. Leak done and fixed.

Edited March 16, 2024 by Kband1