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Since they run in parallel, there's no way that a heater core will cause a radiator to get hot.

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15y ago
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Q: How do you know if heater core is reason for radiator getting hot?
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Your 1999 buick lesabre just had the radiator replaced and then the heater core went out should they have replaced the heater core when they replaced the radiator?

If your heater core wasn't leaking at the time your radiator was replaced , then ( no ) That would be two separate jobs


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You heater works from water flowing from your radiator to the heater core, you may have a leak in your heater core. You most likely also smell antifreeze inside the vehicle. It is most likely casued by a leaky heater core. Unfortunatly depending upon the make/model/year of your vehicle a heater core can be difficult and/or expensive to replace.


If radiator sealer blocked the heater core can it be unclogged?

The heater core can be flushed out and hopefully be unclogged. A water hose can be hooked to the heater core hoses, and water flushed through to clean the core out.


Is the antifreeze going into the heater core coming from the lower radiator hose?

No. The top hose goes to the engine. The bottom hose feeds from the engine to the heater core back to the radiator.


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