My 2000 jeep doesnt heat whats wrong - 2002 Jeep Grand Cherokee

check the fan motor, may be the carbon inside is to short, that makes the fun run strong

You will have to check the flap operating controls behind the centre consol as anything could be wrong from a vacumn pipe to a operating mechanism ,even the computer controlling the climatic control .

there could be 2 things wrong the blend door could be broke or the blend door actuator needs the be replaced

Without doing any actual testing, you won't know what is wrong without replacing a ton of parts. Get a chilton or haynes manual and a digital volt ohm meter and do the tests. At this point, I'd check the fuel pump and crankshaft sensor first as they are most common failures.

Ok, if you are trying to use your AC and its not turning on, odds are your refrigerant levels are low, the system will not turn on when low fluid levels are present so the system doesnt burn up the compressor.

If your blower motor is not operating, you may have a fuse blown that needs to be replaced, or the control chip that plugs into the blower motor (for fan speed settings) has burned up (easy fix).

If your climate control is not throwing out heat when you change the settings to hot, you have a leaky vaccume line and the vaccume pressure is not strong enough to open or close (depending on setting) your blender box. Although typically when a vaccume line springs a leak you will have issues with your selector switch as well (defrost, vent, floor)

Also pay attention to your temp gauge to make sure the thermostat is operating properly, and the engine is not over heating ro getting excessivly hot! If it is, then you need to replace the thermostat ($8 part)
and go from there. Also you should check your heater core, if it gets clogged or has restricted coolant flow, your system wont have the heat it normally did (if any) when it worked properly.

This is just a quick summery of the area's you should be looking into for the problems you are having! thanks for using Fixya.com and good luck, I hope I have helped make resolving your problem alittle easier

Could be the switch that controls the fan or the fan its self. Possibly a fuse has blown. All are a fairly easy fix

Down under glove box. When it doesnt blow, rap on the motor with a wrench or hammer. if it tries to blow, or comes on, the blower is bad, replace it.

hi this could be down to bad conetion on the wireing , check all conections , clean them down , if that doesnt work then its in the electris somewere . you need to trace it ,

alot could be wrong. to start the radiator needs coolant to run through it. if that doesnt happen then the car over heats. need new radiator and new fan probably also.

thanks for more info replace the crank sensor it is breaking down when hot once it cools off it will work again .when they go bad the heat from the engine will break down the sensor