Heat blows cold

Check your coolant level ASAP. If the proper level of coolant is not present in the system, the heater core will not see full temperature, and air that has contaminated the system will inhibit the flow. Fill and Bleed with your heat on and the vehicle running...and check for leaks (since you lost coolant somewhere)!

Also under the hood there 2 hoses going into your heater core. one goes to and one comes out of core. One going in should be fairly hot one coming out should be warm. If they one coming out is cool, heater core could be blocked.

I have had a few girlfriends like this- and I have NO idea what is going on- is it me?

Lol...yeah its u!

I have a 2003 jeep liberty. When I turn the heat on setting 1 and 2 the heat get hot. When I turn the setting to 3 and 4 the heat blow warm air. I replace the thermostat same problem

I have the same problem I flushed the heater core and still no heat!!

Did you ever fix yours?

Hey I have a jeep with the same problem? I flushed heater core and radiation and still no luck? Did you figure out why?

I have a 2002 Jeep liberty and the “heat” comes out chilly/warm rather than hot.. why is that ?

I have heat that will roast you out in my 2002 Liberty but there is cold air coming from around the glovebox and I don’t see any holes or missing seals etc...still looking

I have a 2002 Jeep Liberty that has had the same issues. I changed out the radiator due to a small crack, have checked the heater core & fuses still having problems....relays are next. Ig anyone has any ideas please let me know!

There is a second flap door behind the first one that controls the heat. If the gear gets stripped the front door works normally but the heat door won't open for heat. Good luck getting the second door open

the problem is that the heater core is plugged unlike older heater cores that have a continuous tube that is coiled up.... your vehicles have a tank and tube flow through design made of plastic and aluminum ...so what happens is that over time the back of the tank and tubes get plugged and slowly get plugged forward to the point its only letting some coolant to flow through and once the fan is turned on it pushes air over the majority of the plugged are which is not getting warm at all ...anther sign of this is heat on pass side only and none on driver side ...you can flush it all day long but will not be enough to clear it...have replaced heater cores in the same customers vehicle more than three times...meaning the same car has had three cores installed for the same issue

My friend just bought a 2008 Jeep Liberty, heat blows out nice and hot from passenger vent, the other vents are warm at best. Heater core as Moparjohn suggests? If so heater core needs to be replaced?

Check the blend door before going to extremes

Heat works good when driving 55 mph or above 2500 rpm. Sitting still it's cold air no matter if the jeep is heated up or not.

Have a 02 jeep liberty sport flushed heatrt core and radiator gets warm nothing more I'm in upstate NYS and it gets colder than a prea her in a house of illrepute I see there is alot of this on this site has anyone had any luck? Any help greatly appreciated

I have a 2009 liberty, with the same issue. Blows heat intermittently, blows cold other times. It blows colder on the driver side to the point of fogging up the windshield. Would the solution be the same as posted above? Or is there a difference between the 2002 and 2009 Liberty in this area? (question was originally asked about an '02 and just want to make sure the answers still apply to a '09)

PS-Any idea how much the suggested above repairs would cost? (Canadian Dollars)