My 2002 liberty is overheating. If if run the air and sit at a stop sign it will run hot and immediatly heat up. If I sit idle at any time it will heat up. Replaced radiater twice and relay keeps going bad have had to replace it three times and the harness for it once because it was burnt. It works for awhile but then goes bad again. Even had to replace the compressor

Jeep Liberty heater not blowing hot air Questions & Answers ...

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Jeep Liberty cars & trucks heater not blowing hot air questions and answers. Ask your Jeep heater ... My 2005 Jeep Liberty will not blow heat through ... properly.

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Check to see if your heating system is properly filled. Air in system can often prevent the proper flow of hot coolant into the radiator core resulting in your issue.

start with check fluid level --cooling fans operation --water pump to start

Could be your blend door is not opening all the way on heat,here's a link to look at.

so the RAD is going to be good with leaks that it?
it has to hold pressure or it will get too hot,
14psi pressure,
I take my IR heat gun and check all rad tubes
top and bottom
and find, 3 are not 50 degree,drop end to end read same
those 3 are clogged, now you have 2 reasons to replace that bad rad.
something smokes, what?
it dont overheat parked, what is outdoor temp, 75f like here or 0F?
it must overheat idling, if it does moving.
how fan it not?
wont overheat A/C OFF you said.
so its marginal

ether rad tubes clogged
or fans dead,
one or both.

For car running hot and overheating issues, I suggest to you go through this help links. Click this link below and go through the troubleshooting procedure to take care of the problems: ----Car runs hot? http://howtobyme.blogspot.com/2011/11/car-runs-hot-in-traffic.html
-----------All types of car overheating problems and troubleshooting?

http://technoanswers.blogspot.com/2011/11/all-types-of-car-overheating-problems.html
Car freeze overnight and started overheating while driving?http://technoanswers.blogspot.com/2012/01/car-freeze-overnight-and-started.html-----------Engine Overheats and heater blowing cold?

http://howtobyme.blogspot.com/2011/11/engine-overheats-and-heater-blowing.html

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Car overheats and Air blows hot at idle?
http://howtobyme.blogspot.com/2011/11/car-overheats-and-air-blows-hot-at-idle.html
--------overheating? http://schematicsdiagram.blogspot.com/2011/12/buick-century-overheating.html
----------Car engine Overheats and transmission starts slipping?http://schematicsdiagram.blogspot.com/2011/12/car-engine-overheats-and-transmission.html
----------This details will help.Thanks.

check that the charge of r134a is sufficient in the system. When idling, the pressure should be 25psi to 45psi on the low side as measured by a pressure gauge usually on a hose connected to the low side with a can of freon.

HAVE IT SCAN TO CHECK FOR IDLE AIR CONTROL CODES.IF IDLE AIR CONTROL IS OKAY.YOU COULD HAVE BAD SPARK PLUGS AND WIRES.A LEAKING INTAKE GASKET OR MISSING VACUUM HOSES OR LINES AND A FAULTY FUEL INJECTOR WILL CAUSE CAR TO SHUT OFF WHILE COMING TO A STOP.

you might need a new thermostat

1st check the coolant level. If it's low, it won't circulate thru heater core, and result is little or no heat. Let me know what u find, we can continue.