I am the one with the 2005 jeep liberty overheating problems I asked about overheating solutions earlier today, I have more information to add hoping that will help. On the heat gauge it's about 98%, within a minute of turning on the heat full blast it drops to 3/4 and after two minutes to slightly over the half way mark. Holds there with the heat on. As I said in prior question we have already changed the thermostat and fan motor using zerex G 05 coolant.
Dandy. That implies the radiator is not giving up the heat to the surrounding air and the heater core is doing that instead. Either the fan is not turning on or the cooling fins between the tubes in the radiator are corroded away. A 2005 model shouldn't really have a corroded radiator yet so be sure the fans are turning on. If that is the problem, it won't overheat on the highway. It will if the radiator fins are corroded, (or plugged with a butterfly collection).
Feel the top radiator hose too. It should be too hot to hold onto for very long. If it's not, coolant isn't circulating fast enough through the radiator. Feel all areas of the cooling tubes if you can reach them to see if there are any spots that are significantly colder than other areas. If there is, some of the tubes are blocked.
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November, 4, 2012 AT 11:31 PM
I've driven it and replaced, thermostat, and radiator fan. Problem still exsist of overheating, with heat on full the temp drops on the dash to relative normal range, highway temps runs 3/4 the way with heat on full blast, city driving it drops and holds at halfway. I stopped driving felt te top hose hot as a firecracker and sounded like boiling inside. Bottom hose where the thermostat is was cool as could be. The fins seemed cool to the touch as well everywhere I could touch. The only hot part was that top right hose. The drive was about an hour. Any ideas? Forgive my grammar I'm using a phone, my pc hdd failed.
November, 6, 2012 AT 9:59 AM
Your description points to a plugged radiator. Being cool is the clue while the top hose is hot. It's too new to have rotted cooling fins on the radiator but if they were, the tubes would all be real hot, not cool as you found. With a lack of circulation through the radiator, the heater core acts like the radiator because that's what it actually is.
The only other thing would be a thermostat that isn't opening. That also would block coolant flow. If you used a real lot of gasket sealer on the housing, it might have squished onto the thermostat and sealed it shut. On most engines today coolant still circulates through the heater core when the thermostat is closed. If you find the air from the heater is real hot, that proves the water pump is working and the radiator is not.