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Old 01-30-2016, 07:50 PM
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Bizzare Liberty Heating Issue

Hello to all the Jeep Garage members! I just recently joined this forum because I am experiencing a strange heating issue with a good friends 2002 Jeep liberty and I was hoping someone could lend some advice. I will try my best to make this a short story with plenty of details. The vehicle was having little to no heat coming out of the cabin vents. I did a complete flush (2 times) on the coolant system as well as doing a back flush on the heater core, radiator, and motor. While I was at it I changed out the thermostat. I am aware this jeep has a bleeder screw for purging air at the top of the water pump housing, but it was previously striped by someone so it was unusable. I filled the system up, ran the car for a good hour or so with the cap off and the heat on to try and get the air out. I also tried squeezing the top radiator tube multiple times to try and force any air out. As well as manually revving the motor and watching all the air bubbles come up in the reservoir. I drove the car around a few days and checked the coolant level accordingly. Now lets get to the problem. The vehicle reaches correct engine temp and the heat now cranks out of the cabin vents when idling and driving around town. When I jump on the highway and get up to 70-75mph the engine temp drops along with the heat. The engine temp does not drop all the way down, but the needle will drop about a 1/4 from the half way mark. As soon as I get off the highway the engine temp goes back up along with the heat. I thought the new thermostat was faulty so I replaced it with another new one (yes, I lined up the thermostat bleed hole at the 12 o'clock position) and I'm experiencing the same exact problem. I also checked for correct operation of the fan and everything is working properly. I'm going to say the cooling system is still air locked somewhere, but I'm not sure how to get all of it out. So to get to my question, does anyone have any ideas of how to get the rest of the air out of the system (pressurized, no radiator cap) or is there another problem with this that I am overlooking? Sincerely, LibertyIssues

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Old 01-31-2016, 01:58 PM
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Re: Bizzare Liberty Heating Issue

Welcome to the garage.
I would try to get more air out by loosening the upper rad hose clamp at the engine side and pulling it off just enough to have a slight opening at the upper side. While holding it like this, let a helper poor some more coolant in the radiator until no bubbles come from the hose and re-install it. You can eventually also try to get the air out by putting the jeep on an incline, with the nose up and run the engine for a bit with the rad cap of. Some coolant will flow out while it heats up, but hopefully the air as well.
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Old 01-31-2016, 03:07 PM
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Re: Bizzare Liberty Heating Issue

Thank you for the reply Frango. I actually managed to remove the bleeder screw with a ton of heat and using a smaller Allen socket than intended. I was able to bleed it correctly and now the engine temp doesn't go down while driving on the highway. The vent temps do drop slightly from 125 degrees around town to 115 degrees on highway @ 75mph (my friend does not drive that fast), which I can live with. If I slow down on the highway or exit the temp goes right back up. I bleed it three times between three different road tests with the same results in slight temp drop. I think I'll see if I can get more air out over the next couple days.
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