I've changed the thermostat a couple of times, core not leaking,..When I put the fan on to blow in the two low settings, barely any warm air comes out, but it is a little warm...when I put the fan on high, it is all cold air...In cold temperatures, this is too hard to take...What could be the problem? Temperature on the gauge goes to the middle, where it should be....No problems with overheating etc... My Jeep is really a 1997 TJ Sport, but the products below didn't have that so I picked the next one closest to my Jeep..
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Try the code trick, turn your ignition on and off, but not to the point that it starts 3 times- cycling the ignition key On - Off - On - Off - On- within 5 second or so you'll get some numbers on the odometer, record them and google the codes, or buy a cheap code reader....Your right around the year that doesn't work, but it can't hurt to try....
Is it blowing at all -and the way it is suppose to? Do you get it after driving awhile? Is anything leaking-even just a bit?
Check for enough coolant in the radiator(hear a gurgling?-low coolant) enough?Yes->check all hoses for cracks, splits, leaks,)all ok? Yes->-are the heater hoses hot after running a bit? yes?->flush the heater core, still nothing?-change the temp sensor..
Have you checked your water temperature sensor? A little thing like that can affect the heat put out with low readings coming out if it is not giving the right voltage. They are under $20 so that should help you out. The Jeep brand is originally AMC(American Motors Corporation) of wich the parts utilized came from different american brands (Alternator from Chevy or Ford, Motor from Dodge, etc.) But the put out for the heater core is the same. Just get the temp sensor changed and run the appropriate coolant for your Jeep year.
Air in the system or a clogged heater core. If it's air in the system, it needs to be burped. Click on my screenname, go down to Tips and Tricks, and follow the tip there on how to do so.
If the heater core is clogged, you'll need to blow it free. Follow the two heater core hoses from the firewall out to the engine. Disconnect them both, put one in a bucket, and use the blowgun attachment for an air compressor to blow into the other one. Then swap - put the one you blew into, in the bucket, and blow into the one that was in the bucket the first time. Reconnect the heater core hoses, and burp the system (again, follow the Tip instructions for that). Usually that will take care of it.
The only reason it won't blow hot air is because the water is not getting to the heater core. Check to see if you have a heater control valve in one of the two lines to the heater core. If so check to be sure that is is opening and closing. If it won't open then you get no water flow in to the heater core.
The heater in your car depends upon a flow of hot coolant going through the heater core in order to get hot air into the car. If the heater core is partially plugged, it will restrict the flow.
If you have a head gasket that is putting exhaust into the cooling system, it will eventually get into the heater core. When this happens there is no coolant in the heater core to make the air warm.
If the water pump vanes have corroded away the result will be very poor coolant circulation causing the heater to not blow hot air.
If your car is equipped with a heater control valve that is not functioning properly, the coolant flow will be restricted.
One or a combination of these factors is likely the culprit in your case.
Flush the heater core 2-3 times, and if the obstruction does not clear, a new heater core is required.
However in your case, a cracked head is suspected - this will give out a plume of white smoke on startup - There is no smell, carpet dampness, or abundant moisture in the cabin? (this warns of a leaking heater core)
The coolant is leaking through a gasket or crack, and entering the combustion chamber. You dont see a leak on the ground because it is being burned up with the fuel.
Good Luck, and thanks for using FixYa - A FixYa rating is appreciated!!
unless you got visable signs of leakage its not heater core, but it could be pluged with sediment. take off both heater hoses and flush it both ways until it runs clear. you can also mix a little baking soda and water and pour in core and let set for a while and then flush.
heater core may be clogged. disconnect the hoses. CUT THEM OFF THE HEATER CORE!!!! If you pull them you may damage the solder joints at the tubes causing a leak. Them connect a garden hose and flush one way then another till water runs clear.