Question about 1998 Jeep Grand Cherokee

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I replaced the water pump and thermostat in my sons 1998 Jeep. It has a 4.0L and the water pump out let hose back into the radiator sits several inches higher than the radiator. This is causing a air lock. There are no vents on the hose. So with this in mind how do I fill the entire system and eliminate the air lock?

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4.0 engines aren't really prone to air locks. Keep the heater on high while re-filling. If you have an overheating problem and you can't get the radiator to fill fast enough, likely the radiator core is internally blocked. When that happens it seems that the upper hose can't be purged of air. Jeep radiators are in my opinion too small for the engine and if partially blocked, have no "leeway" or forgiveness. They just will not fill correctly.

Posted on Sep 24, 2009

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Posted on Jan 02, 2017

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