PCM 6.0 model409 losing coolant

[Cent]

I have a PCM 6.0 model 409 that is losing coolant from the closed part of the cooling system. Will go from Max fill line to minimum fill line in less than hour I believe.

 

I cannot find a leak in any line after looking. Do not find coolant in the bottom.

 

Anyone with a similar experience? Any ideas? Solutions?

 

The boat has a heater and the connections are not visible. I may take out front panel and try to access it. Not easy. Tight area.

 

Thanks for any help.

[unksskis]

Mine is a full closed (2011), and leaks out at the seams/gaskets on the manifolds.

[skihart]

Any issues with the heat exchanger? Did a good job draining it in the fall?

[Cent]

Coolant part is not drained in fall. Other part of system was drained.

 

Put on about 16 hours since back in water. Coolant was low when went back in. Topped off. After 16 hours lie again and seems to be losing coolant.

 

Just checked up by heater hoses. There on back of heater so could nit reach to tighten but carpet is dry under them.

[DanE]

@Cent

Does it continue to leak below the minimum or does it stay that way?

It's pretty normal with a low level when you got a heater, don't think you can expect the level to stay at the top mark as the expansion volume becomes insufficient when a heater is installed.

@Jody_Seal ?

 

[Cent]

Thanks. Pulled dipstick and oil looked fine to me.

[DW]

You should be able to “borrow” a radiator pressure tester from an auto parts store if the tank uses a typical radiator cap. If a head gasket is suspect a leak down test would blow bubbles in the tank.

[Kelvin]

My 2011 was leaking from a joint between 2 of the full metal exhaust pieces. Don't have that boat anymore to take pictures to show you.

[RichardDoane]

you should be able to get a pressure cap adapter for the reservoir and put pressure on the system when cold. be patient and keep checking for seepage. coolant doesn't just magically disappear.

[Cent]

Thanks