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you may have a bad thermostat,replace and see.
you probably have a leaking heater core....you can replace it or bypass it
Check the temperature gauge. If it is running cold, replace the thermostat.
have you checked the engine thermostat. I have a similar problem..no heat or air. according to a service manual there is a door at the heater core that is supposed to open when the heater switch is turned on. this could be the cause for both of our problems. any ideas for getting to the heater core?
Yes.
No.
Heater core needs to be checked May need to be changed or cleaned answer heater core is bad, replace with a new one
By burning them
No.
u need to replace the heater core in your car
mostlikely the jeeps been off road and mud and grass, or muddy water got to your heater core area,letting the smell airgate through out your heater when turned on.
Your heater core is leaking. The only fix is to replace it. This can at times be a very difficult job. It is easy to remove and replace, but most of the time very hard to gain access to the core. For this reason, you will find that this repair can be fairly expensive, so don't be surprised at what they charge. I also recommend you have them do a complete cooling system service at the same time. Drain, flush, replace the thermostat, heater core, and add the proper amount of coolant. As the car is 12 years old, I would also replace the heater hoses, if they have never been replaced.