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if they have replaced it 3 times and still can't get the leak stopped A. It not the heater core something else is leaking
B. there using a used heater core (which is my opinion is plain . . stupid) C. the mechanic has no idea what he doing First thing they should have done when car was brought in the 1st time was check for other leaks if it is the heater core still leaking the mechanic is installing it wrong or not geting hoses tight. the actual changing of the heater core takes only about 10 minutes and actually a easy process that anyone could do. What takes the most time is getting to the heater core because the majorly of the time the whole dash has to come out which takes hours
I would take your car somewhere else and have it fixed right and have them bill the dealership for the repairs
Hi: The only way to clear up a clogged heater core, is ti have the coolant system flushed. Take you car to a reputable radiator shop. They will add a radiator cleaner to your heater core directly, and let it sit there for a while. Then the vehicle will need to be started and allow the thermostat to open. Once heated, they will flush out the entire coolant system, and replace it with new coolant. The cost will be approx. $100 - $200.......better than the $1500 to replace a heater core. A well maintained vehicle should have this procedure done every "5" years.
I'ld say yes, heater core. But before swapping it out try this. There are two hoses that lead to your heater core. Disconnect them and add two longer hoses to it. Run one down to a bucket on the floor. The other flush with high water pressure, then there is this acid you can add. WARNING, I DID SAY ACID. It will eat your skin and if you leave in your heater core too long it will eat you core too! After say 2-3 mins flush with high water pressure again. On second flush I'ld flush for a good 10 15 mins to make sure it's all out. Reconnect factory hoses and refill system.
If it's your heater core, unless you're a mechanic you probably should get professional help. The heater core is located on the firewall and many parts need to be replaced to get to it. Do you see water on the floor inside the vehicle, Many times a heater core will leak inside.