The heater on my daughter jeep stoped putting out hot air and she has a new baby and it has gotten real cold

There is something called a blend door in the heater box. This door is what moves to change from cold air to warm air. The part is 86 dollars online. http://www.factorychryslerparts.com/products/JEEP/LIBERTY/ACTUATOR-Blend-Door-AC-and-Heater/4341513/05066519AA.html

it appears that you have an air lock in the coolant system. bleed out the air by loosing of the highest hose until only water comes out or have the system pressure bled at a radiator shop.

Heater core is not working.

Heater blowing cold air,indicates towards low or no coolant or the coolant flow is getting obstructed or the heater core is clogged or hot to cold moving flap/ door is stuck in cold mode. There are many possibilities, that needs to be checked. Click the link below for step by step details:--- http://technoanswers.blogspot.com/2011/10/heater-blows-only-cold-air.html ---------- This should help.Thanks.Helpmech.

If the blower is blowing air just fine, but you cannot control the temperature, you need to listen to air coming from the vents while turning the temperature from hot to cold. If you do n ot hear any change in airflow, then you may a temperature door in the dash broken. this is becoming a common problem on the Equinox and Pontiac Torrent,

Tech JK
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do the heater hoses get warm?
if its warmed up and you turn the temp to cold does it get colder?
when you turn the temp to hot do you hear a pop like something is binding?
it may be just a problem with blend door or the actuator

feel the two hoses going to the heater core... are they both hot ? also make sure all the air is out of the system

Robert

...You need to make sure you have the correct thermostat! Usually, there are 160, 180, and 195 degree therms for this jeep. 195 degree therm should be used no matter what the season. If you have a lower temp therm., you will not get good heat (or any at all) in cold weather. Also, You should flush and fill your cooling system to get any contaminants and/or debris out. Check the heater core...it may be **** at this point!

Heater Core is blown so now it's not producing Hot air just cold! Same thing happened in my 96 Jeep. You have to replace the heater core.

Okay. warm up vehicle, get radiator hoses hot.  Turn on heater, fan on low.  Grip both rubber heater hoses close to the firewall, from the engine compartment side.  They should be too hot to hold for long.  If they are not hot, then you have a lack of coolant circulation to the heater hoses.  If they are hot then access heater core, behind glove box area.  Blend door which moves as you chose HOT or Cold, should be cable controlled, move the controls and be sure the door is actually moving. Keep me posted