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I can smeel antifreeze coming from the airvents , but only when i put the heat on. I checked the heatercore and it seems just fine. no leaks that i can see , and im not really losing any coolant , what could be the problem? thanks !!

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  • anavar99 Jul 28, 2010

    thank you very much !!!

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HI. The only other possible issue would be the lines running to the heater core. It is also possible that there may be a slow leak somewhere else in the engine bay and the blower is, essentially, sucking the smell in from the outside. Check under the hood for any leaks at the radiator, overflow tank and heater core inlet/outlet hoses.

This could also be a simple cabin air filter contaminate, however,you could also have a pinhole in the heater core. Air passing through the heater core will pick up the tiny amount of antifreeze and circulate it inside your car, leaving your floor and core compartment dry. This issue will cause the antifreeze smell to exit without ant trace or liquid on the floor or in the core compartment. This hole will become larger overtime.

  • NOTE_When checking the antifreeze level; It must be checked when the motor is cold. Put a black magic marker line on the exterior of your coolant recovery tank at the exact level as the coolant. Check the coolant level in the tank every day for a week. You can also administer a coolant system pressure test to isolate the leak, as well. Any mechanic will be able to administer the test.

Posted on Jul 28, 2010

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Smelling antifreeze indicates to me you have a crack in the heater core. Most are made of plastic. This shows yours is metal. I guessed on 2WD or 4WD and size of engine.

http://www.autozone.com/cooling-heating-and-climate-control/heater-core/spectra-premium-heater-core/979573_717836_0

Unlikely to be frost plugs unless you ran the system without antifreeze and the block partially froze. When they freeze fully, the plug pops and out and you lose all the coolant when it thaws.

Finally, this is a common problem with the Durango! As my learned colleague says, replace the thermostat as it needs to be fully open to let water flow well to the heater core.

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