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Old 03-08-2007, 12:24 PM   #1
Jeeplife7926
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Default Coolant Overflow always empty

Like it says my overflow is always empty. I would venture to guess thier is an air bubble in my radiator system caussing it to evaporate and use the coolant.


Also out of curiosity how does the ssystem use the fluid the only hose to the tank seems to be a tube located at the top of the resivior. it seems like thats a return for coolant becuase I cant imagine the coolant is getting sucked up through that line. If thats correct whys the tnak there.


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Old 03-08-2007, 12:34 PM   #2
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methinks you've got yourself a leak somwhere, the coolant system is a closed, pressurized system so there shouldn't be any "evaporation". As for the coolant bottle, the hose is conected to the top of the bottle, but actually pulls from the bottom.
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Old 03-08-2007, 01:48 PM   #3
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If you haven't noticed any leaks on teh driveway, check the color of the oil. Common leak spots are the hoses to the radiator and the water pump. Sometimes waterpump leaks drip down the radiator hose and make you think it's the hose. Also, check the passenger side floor, if it's wet, you may need to replace the heater core.

Also, definitely check the oil. If it's white, you've got a blown head gasket and the coolant is going into the oil, which is very bad.

The system can pull coolant out of the overflow bottle when needed, and push it back into the overflow when it doesn't need it.

Did you change the coolant lately?
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Old 03-08-2007, 02:43 PM   #4
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I have a 98 as well and that tube at the top of the coolant overflow tank extends down to the bottom. So it can and will draw coolant back in as needed and purge as well when it has to. There is fill lines on the side of the tank. I would slowly start adding coolant to the tank over the course of a week until the coolant level stays more or less at the full line.
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Old 03-08-2007, 03:28 PM   #5
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My old 96 did the same thing, never saw any coolant in the oil, but then again my Jeep liked to eat coolant pumps...
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Old 03-08-2007, 09:12 PM   #6
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I think the heater core is the culpret. Passenger side floor has been wet under the floor mat. I thought it couldent evaporate through my rubber mats

So who knows about heater cores?
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