Question about 2004 Hyundai Santa Fe

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Water leaking from pipe in firewall (possibly heater core)

This happens only when the AC is running.
AC still cools down and heater works!

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That is the condensation from the A/C system, and this is normal. When it doesn't do it, you have a problem.

Posted on Jun 02, 2009

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Posted on Jan 02, 2017

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I ALSO LIKE MANY OTHERS HAVE A 2002 TAURUS. HAD BEEN HAVING ISSUES OVER HEATING OR ALMOST. I NOTICED THAT THERE WAS AN EXCESSIVE AMOUNT OF WATER SPITTING FROM A PORT HOLE IN THE LOWER RIGHT FIREWALL WITH...


The heater core would be the suspect in this case as the only sources of water in that area are the heater core and AC evaporator. May only be leaking under high heat and presure, the new thermostat may have helped this for a while but if the pressure is too great and there is a hole then the water will find it. Could also be a hose dripping inside the firewall for the heater core.

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Heater core?


ok most cars you wont see a physical drip because the box is sealed to the firewall it will run out the drain hole the same as the ac if bad enough they will leak down the insulation right to the floor board running pure water will cause rust but rarly causes the heater core to blow what you arre looking for is the problem that started it all why she was adding water to begin with you didnt mention the type of car and motor so i really cant get into diagnostic procedures you can bypass the heater core on most cars if it is using that much water you propably have a blown head gasket that will make the heater core blow let me know the type of car and I will help you diagnose it further

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