Coolant disappearing

[Patton]

Hello,
My 94 fZJ80 is consuming coolant,
No water in oil, no oil in water, no steam from tailpipe.
New stat
New lower hose
New cap
Lots of new coolant
New temp sensor

Thanks.

 

[BILT4ME]

Heater core inside the truck
Rear heater inside the truck
Hoses under the truck
PHH
Is your carpet wet inside on the passenger side?
Hole in your coolant recovery tank?
Hole in the fins of the radiator or on a seam that is hidden so is blown over a hot engine while operating?
The Cat's will eliminate MOST of the vapor from the tailpipe, so it's a LOT less visible than it used to be.
Get a Blackstone oil analysis to confirm your second line in your statement.

 

[fatfish]

Check the rear heater lines, mine was leaking under the guard for the cats.

 

[Patton]

Thanks guys,
I have no rear heater and no wet carpet,
I'm thinking it is going out exhaust but can't be seen because of converter like you said.
Looks like it is time for that 6.0/4l80 swap ahead of schedule. Going to be a long summer without my cruiser

 

[BILT4ME]

What do your spark plugs look like? If one is white or clean as a whistle, then you're burning coolant there. All the plugs should be a light toasted-marshmallow tan. Black and crusty is oil fouled, black and wet is fuel fouled. White or really light tan is a lean, hot burning plug.

Pull your spark plugs, take pics of them in order (1-6) and post, then we can all see what's happening (or not happening)

 

[Patton]

What do your spark plugs look like? If one is white or clean as a whistle, then you're burning coolant there. All the plugs should be a light toasted-marshmallow tan. Black and crusty is oil fouled, black and wet is fuel fouled. White or really light tan is a lean, hot burning plug.

Pull your spark plugs, take pics of them in order (1-6) and post, then we can all see what's happening (or not happening)

 

[Patton]

Thanks,
That was my next move is to pull plugs, I will report back my findings.

 

[retrofive]

I blame California.

 

[LuckyOreo]

check your freeze plugs on the engine block. I have similar issue where I keep losing coolant but the truck runs fine. I found out that there is a slow leak from one of my freeze plugs. I still need to replaced mine soon as I get a chance.

 

[Mighty690]

Blackstone Analysis is the easiest and cheapest thing to do next. (FWIW, I had no clear evidence of my HG leak until I sent in a sample.)