jstaif
Member
- Joined
- December 9, 2014
- Messages
- 13
- Reaction score
- 0
- City, State
- Harrison Twp, Mi
- Year, Model & Trim Level
- 2002 Exp XLS 2007 XLT
Greetings, Looking for help on where my coolant is going to...
Have an 02 Explorer with the 4.0 SOHC engine, high miles (286K). Coolant has been disappearing from the system at about 16+ ounces a week but can't find where it is going, have checked the following:
Pressure tested the system, It holds pressure for the 30 minutes + that I have tested it for with no coolant appearing anywhere or any puddles on the ground. Not leaking through any external areas: No hose leaks, not leaking through the thermostat housing (new) or coolant temp sensor. No evidence of pooling on top of engine or anywhere else.
Added the leak trace to the coolant but still found no leaks with black light anywhere under the hood after driving or while pressure testing
Oil looks normal (no milkiness present).
Ran the block tester CO test for at least 30 minutes and fluid stayed blue...no exhaust gases apparent in the coolant.
Bought a new reservoir cap that holds the 16psi.
Nothing noticeable is coming out of the exhaust i.e. smoke etc. Once in a while I smell coolant around the engine but usually not. Coolant might be disappearing at a faster rate when I drive at higher speeds 70mph +.
No other symptoms exist, runs at normal operating temperature. I bought this car new and it has never been allowed to overheat.
Wondering what internal interfaces exist for coolant leaks on this engine. It seems the the plastic intake manifold and exhaust manifold only mate to the head, so no water jacket interfaces are part of these interfaces.
This would leave the Head Gasket coolant interfaces that I have not seen issues with:
1) to the combustion chambers
2) to the outside
3) to the crankcase
I'm feeling kind of stumped here. Am considering using Blue Devil in the coolant. Would like to get a few more years from this old gal.
Any clues on where the coolant is going???
Have an 02 Explorer with the 4.0 SOHC engine, high miles (286K). Coolant has been disappearing from the system at about 16+ ounces a week but can't find where it is going, have checked the following:
Pressure tested the system, It holds pressure for the 30 minutes + that I have tested it for with no coolant appearing anywhere or any puddles on the ground. Not leaking through any external areas: No hose leaks, not leaking through the thermostat housing (new) or coolant temp sensor. No evidence of pooling on top of engine or anywhere else.
Added the leak trace to the coolant but still found no leaks with black light anywhere under the hood after driving or while pressure testing
Oil looks normal (no milkiness present).
Ran the block tester CO test for at least 30 minutes and fluid stayed blue...no exhaust gases apparent in the coolant.
Bought a new reservoir cap that holds the 16psi.
Nothing noticeable is coming out of the exhaust i.e. smoke etc. Once in a while I smell coolant around the engine but usually not. Coolant might be disappearing at a faster rate when I drive at higher speeds 70mph +.
No other symptoms exist, runs at normal operating temperature. I bought this car new and it has never been allowed to overheat.
Wondering what internal interfaces exist for coolant leaks on this engine. It seems the the plastic intake manifold and exhaust manifold only mate to the head, so no water jacket interfaces are part of these interfaces.
This would leave the Head Gasket coolant interfaces that I have not seen issues with:
1) to the combustion chambers
2) to the outside
3) to the crankcase
I'm feeling kind of stumped here. Am considering using Blue Devil in the coolant. Would like to get a few more years from this old gal.
Any clues on where the coolant is going???