Hi Ondelea.
see if this link helps you out.
2003 Jeep Liberty heat problem it blows cold air Google Search
SOURCE: 2004 jeep liberty does not produce heat when
check and fill radiator and filler canister for coolant.
SOURCE: heater blows cold air when stopped and warm air
Most of the time it's because the cooling system is not completly full just a quart low will make it do this and if it's low theres a leak somewhere so it needs to be found and fixed. as simple as the hse from the raditor cap to the resivoir or the cap being bad or just dirtly. If anything appears dirtly not clear fluild green or red but clear then you need to flush the system. and then make sure its filled completly and recheck after youve drove it as its diffacult to get all and air out and your problem will be corrected.
SOURCE: My 2005 Jeep Liberty will not blow heat through
heater valve if you have 1 ,or temp control actuator which is under the dash and takes hours to replace!
SOURCE: My 2003 jeep liberty only blows hot air. Even
have the gas checked out first before you start playing with it ,it should hold about 700grms of gas minimum
SOURCE: My 2006 jeep Liberty Front
Sounds like defrost door on heater box is not work You need to get under dash and check controls on the box. Good luck
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