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No, the catalytic converter has nothing whatsoever to do with your defrost system.
Check your fuses!
The biggest threat to the jaguar is the destruction of it's habitat. The jaguar is of this date not an endangered species, but could easily make the list if more steps are not taken to ensure its survival.
The vehicle does not have just one hose. A vacuum leak in any hose can cause low vacuum and the door will not operate properly. The leak could be under the dash or under the hood.
You could always take it to the shop You could always take it to the shop
You can if your microwave has a defrost mode.You can if your microwave has a defrost mode.You can if your microwave has a defrost mode.You can if your microwave has a defrost mode.You can if your microwave has a defrost mode.You can if your microwave has a defrost mode.
The air door under the Blazers dash could be stuck, or there could be a vacuum leak on the engine. The door opens and closes from vacuum, directing the air from heat to defrost.
It is defrost.
A loose wire would cause the horn to stop working on your Dodge Avenger 2.4L engine.
The start capacitor could be bad. Is the Breaker tripped? Do you have a timer? Is it working properly?
A leaky heater core can do that. Also if the AC is not operative, the defrost mode can't dry the cabin air.
Blocked heater core, faulty heater valve, disconnected connection to the heater valve.