Question about 2002 Jeep Liberty
Heat turns on when moving but not when parked or idle
temperature of engine is running hot
Look for a vacuum leak. There are numerous vacuum hoses that lead from the intake manifold to the firewall. These hoses provide the vacuum necessary to switch the blower doors to the heat and vent position. It is most likely a loose or cracked hose because the vacuum pulled by the engine is higher when driving, and at its lowest when parked or neutral. This will make it work when driving but not when stopped. If all vacuum hoses in engine compartment are ok, you may have an internal vacuum leak inside the dash or from the controls, this will be harder to find without taking the dash apart. But, the common culprit is the vacuum hoses in the engine compartment since they are always always exposed to extreme cold or heat and rain or snow, which breaks them down over time. If the vacuum hoses even look a little suspect, start changing all of them so you kill any possibility of other problems, as the brake booster is also run on vacuum.
Posted on Dec 26, 2008
Add water to the radiator check if the heater works on idle if so check for a water leak it could be a small water leak make sure to check every day
Posted on Dec 29, 2008
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Dec 30, 2013 | 1995 Jeep Cherokee
Jan 01, 2013 | 2000 Jeep Wrangler
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: ----
temp gauge goes erratic?
Temperature gauge keeps fluctuating up and
down close to red?
Car runs hot? http://howtobyme.blogspot.com/2011/11/car-runs-hot-in-traffic.html
-----------All types of car overheating problems and troubleshooting?
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?
Car overheats and Air blows hot at idle?
----------Car engine Overheats and transmission starts slipping?http://schematicsdiagram.blogspot.com/2011/12/car-engine-overheats-and-transmission.html
Temperature gauge does not move and no heat
when heater is ON?
This details will help.Thanks.
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