Check heatertreater.net for diagnostic information.
The Haynes Jeep Cherokee 1984 - 1996 book has 7 different diagrams which show how to do that repair.
Common problem. The heater grid burns a hole and the only fix is to replace the element.
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My chimney does not function properly anymore. Where can I find a chimney repairman in the UK?
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Need the correct model of vehicle you have and you cannot repair a heater core...........
It is cheaper to replace the heater core than it is repair it
YOU DONT repair them
The blend door is vacuum controlled. Any vacuum leak in the engine system can cause the door to not function properly. Check this system first. The door could be physically sticking but a vacuum leak is a more common problem.