I never know whether my heater will blow warm air or cold. When warm it is plenty warm. The blower works fine and the blender door seems to also as I can direct the air where I like. It seems to always give heat when driving on the highway. My jeep liberty is a 2006.

Have you checked your radiator fluid ?

Thanks. I will do that.

Hello I am not a Pro or anything but I will try and help my name is Mickey. First thing to do like the other person said make sure it has water/coolant. If that checks out OK. The next thing to check and this sounds like this is what's happening to you is the therostat is acting up not opening all the way or sticking open and its taking a long time to warm up from time to time. They are not that costley less than $10 for the part. I think this will take care of your problem.

Thanks. The cause turned out to be low coolant caused by a leaking water pump. mtpreacher