Here is the background: I had my engine replaced last year and after getting it out of the shop, the heater doesn't really work very well. I worked fine before the engine replacement. I say it doesn't really work because on blower speeds 1-2 it will blow barely warmer air and then on blower speeds 3-4 it is as cold as the outside temperature. I say that because if its warmer outside, say 55 instead of 30, it blows warmer air. Anyway, I have replaced t-stat, both heater hoses going to the heater core are hot. The center knob moves the incoming air to the correct vents. I would like any available other troubleshooting steps. I don't want to put it in the shop if I can do something myself. I could pull the whole dash out, but don't want to do that until I have exhausted every other possibility. Any help would be appreciated. Thanks.

_________________
2003 Jeep Liberty Limited 4X4 w/ 17" factory wheels
OME-HD springs with Bilstein shocks and struts
245/70/17 Goodyear Duratracs
K&N FIPK air intake
Sony headunit with 12" Memphis in custom box

BUMP!!! Can anyone help me with this?

_________________
2003 Jeep Liberty Limited 4X4 w/ 17" factory wheels
OME-HD springs with Bilstein shocks and struts
245/70/17 Goodyear Duratracs
K&N FIPK air intake
Sony headunit with 12" Memphis in custom box

I just recently started having problems with my heat too. Even with engine temp at normal midrange, while idling it only blows cold air. It only blows warm after about 10-15 minutes of driving. However as soon as I stop and idle again, it starts blowing cold again. No clue where to even start.

_________________
2003 Limited 4x4
Frankenlift
Al's A-arms
245/75/16's on Moabs
front and rear hitch recievers
Moog Lowers
craptastic Mopar skids

Your issue is low coolant due to a coolant leak,check your radiator side tanks very closely,more so the drivers side tank on the upper side right at the top mounting tab.


To the OP..............

The mode doors(vent defrost and such) is vacuum controlled.The belnd door that changes the temp is electronically moved via a electric motor.I would start there at the blend door actuator.

Well I had a massive leak right where you are referring. I however had the entire radiator replaced only about 9 months ago. I requested all the hoses be replaced at the same time just to be preventative, but I don't think it happened. I guess I'll take it in. Thanks for the heads up.

_________________
2003 Limited 4x4
Frankenlift
Al's A-arms
245/75/16's on Moabs
front and rear hitch recievers
Moog Lowers
craptastic Mopar skids

This is exactly why I love forums. I am having the same issue as onespeeder. Going to be looking for that leak tonight but have not seen any coolant. in the driveway. Hoping it is that simple.