Check to see if the temp door is changing to heat,If that is fine,Then make sure the thermostat is good,maybe just replace it,and refill the radiator,and reservoir with coolant.The heater hoses going into the heater core need to be checked,while the engine is real hot,to make sure the heater hose going in the heater core,and out of the heater core are both to warm to hold by the naked hand.If only one of them is hot,and the other one is warm,to cold to the touch,then remove the heater hoses from the heater core,and use a water hose to flush the heater core out.Put the water hose in one side and flush the heater core out with the force of the water hose pressure.Then do the other heater core pipe the same way.Then replace the heater hoses back on the heater core,and refill the radiator.Make sure to get enough coolant back in the radiator.If there is not enough,the coolant will not flow threw the heater core and put out heat.I hope this is helpful,and you can do the work yourself.You may want to check those heater hose first thing.And change the thermostat anyway,sense you will have some coolant lose from flushing the heater core.If this helps,please let us know,thank you.
When the engine is cold,check the coolant level.
Make sure it's on max.
===
A coolant system should be flush every two years.
===
If you did a coolant flush recently then air pocket can be the cause of the un-even heating problem.
The DIY method is to drive you car onto a ramp or a steep hill.
Iet the engine cool off and top off the coolant tank.
Set MAX heat + MAX fan
Let the engine ran for 20 minutes wih the cap off and the trap air will escape from the coolant reserve tank,
Check coolant level and top off coolant when the engine cools down.
A shop will charge $75+ for this but using an air operated excavate tool!
========
A car with over 90K miles may experience linkage problem to the heater control valve.
The heater control valve (near the firewall) may be stick over time.
Open the hood and move the heater to max and min. Back and forth.
Clean and lube the linkage with WD-40 to free the heater control valve.
If it's a vacuum type heater control valve then cash for leaky vac. hoses.
=======
Move the fan switch back and forth to re-new the electrical conductors.
Pass a vacuum over the control panel to prevent dust build up behind the console.
I presume the fan works as you didn't mention that. feel the heater hoses in the engine compartment where the go into the heater core. they should be roughly the same temperature.
about the only thing that controls that would be a slide control. often that just opens the door to the heater so air passes thru. if the heater core is plugged the only thing you can do is to back flush it to see if that cleans it out... if that does not work you have to replace the heater core
when you move the heater door control from cold to hot do you hear the blend door opening and closing.
the XJ's use a heater valve on their 4.0L engines that will isolate the heater core, while still allowing circulation 
there should be a small amount of heat even with that valve. do you feel any heat coming up from the drivers side defrost ?
×
SOURCE: 2000 jeep grand cherokee v8/heater core
Yes it's the heater core, It's a complicated diy job and unless you are an experienced mechanic you are going to need a good workshop manual for the job.
Best of luck.
Please remember to rate this article
SOURCE: Heater problems on my 2000 Jeep Grand Cherokee. Please Help!!
There are 2 seperate zones for the drivers and pass. side, but they use the same thermostat.
There is a blend air door motor that controls this.
The one on the pass. side is probably bad.
These are kind of hard to replace.
There are on the bottom of the heater box and you need a philips screwdriver about an inch in total length.
There is not that much room between the bottom of the heater housing and the floor.
SOURCE: how do you replace a heater core in a 2000 jeep cherokee sport?
the entire air unit under the dash must come out. This requires that you remove the dash board center concle and steering column. Also on some models you must drain the AC system and then requires new Orings from Jeep. Would not do this without experience.
SOURCE: heated seat 1996 jeep grand cherokee
C1 & C2 in your panel are most likely one of the culprits, if no power at heater at seat. Sounds like testing for power at seat switch is easier to do than get at these circuit breakers in the panel. If you have power at switch at seat, then it's not the fuse/circuit breaker. Good reading at this link for you.
http://www.wjjeeps.com/seats/seats.htm#HEATED
SOURCE: need instruction on installing heater core for 2000 jeep cherokee
The heater-A/C housing assembly must be removed from the vehicle and the two halves of the housing separated for service access of the heater core, evaporator coil, blend-air door, and each of the various mode control doors.
WARNING: On vehicles equipped with airbags, refer to Airbag Systems Safety Information and Procedures. Before attempting any steering wheel, steering column, or instrument panel component diagnosis or service. Failure to take the proper precautions could result in accidental airbag deployment and possible personal injury. See: Restraint Systems\Air Bag Systems\Service Precautions
REMOVAL
REMOVAL AND INSTALLATION
INSTALLATION
WARNING: On vehicles equipped with airbags, refer to Airbag Systems Safety Information and Procedures. Before attempting any steering wheel, steering column, or instrument panel component diagnosis or service. Failure to take the proper precautions could result in accidental airbag deployment and possible personal injury. See: Restraint Systems\Air Bag Systems\Service Precautions
788 views
Usually answered in minutes!
we do not have water flow through the heater core. there should be a water valve to turn the water on
The fan works the airflow doors to both sides and defrost all operate. We do not get water to flow through the heator core. There should be a water flow Valve at the heater core. If there is what controles it and where is it located.
The heater should have a valvue flow control somewhere. Does it or does it not?
×