Question about 2005 Jeep Liberty
I doubt the radiator is plugged up. The hose should be cooler coming out of the radiator than going in (top).
If the overflow tank is bubbling it could be from the hot coolant, or you could have a head gasket leak and allowing compression - exhaust into the cooling system.
Posted on May 08, 2013
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Posted on Jan 02, 2017
First, is the operating temp normal? Have you looked carefully to see if the leak is visible after you turn the engine off after a drive? Have you lost coolant? Have you checked to make sure it is actually coolant and not condensation from the air conditioner (normal)? If you verify coolant (green), then remove the bottle and fill it with water. If it's leaking, common or not, you need to replace it. (generally inexpensive at any scrapyard)
Posted on Jul 06, 2009
SOURCE: 4.0 liter 6 cyl 2000
Either there is still air in the cooling system or you are correct that the headgasket has failed.
Running with the cap of for at least 20 minutes should clear the air out of the cooling system. If it continues to bubble after that than the bubbles are likely combustion gases sneaking by the head gasket.
Let run it with the cap on and let it start pushing coolant into the overflow. Shut it down and smell the coolant reservoir. If it smells like exhaust it is the head gasket.
Posted on Oct 18, 2010
SOURCE: I put new thermostat on
Flushing a radiator at home is most often a waste of time. The chemicals used by a radiator shop are far stronger than anything you get at the parts supply house. What happens is that the flow you see is deceptive as the water tends to flow around a partial restriction and does nothing to remove it.
Though your garden hose has a lot of pressure it doesn't have the volume necessary. A garden hose will usually be sufficient to flush out a heater core though as it's smaller.
Have a radiator shop flush your radiator core and have a hydrocarbon test done on the cooling system to eliminate the possibility of head gasket problems. When re-filling the system, turn the engine off just before it reaches 210 degrees and let it sit for a few minutes so the thermostat can open, then continue filling. Always fill with the heat on high. Thermostat goes in with the spring end into the engine.Forget about the water pump...unless you got one made for a twin engine marine (CCW) application it has nothing to do with the problem though I've heard but never actually seen that the belt can be installed so it turns backwards.
When the engine is at operating temp cover the grille and force it to nearly go into overheat...the electric fan should come on and the mechanical fan should lock up to try to counteract that.
Don't open the system when it's hot (you found that out already). And, don't allow the engine to actually overheat.
My bet without seeing it? Likely a partially obstructed radiator. 4.0 engines make a lot of rust residue even when maintained. If that's what you have in there, or even the 4cyl. It is more than likely.
Posted on Jan 19, 2011
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