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you can tell if your heater cooling system/core is broke as the car will not produce heat when you turn on the heat inside the car. if it is not blowing heat there could there is a problem. the heater core itself should look like a small radiater, if that is clogged it could cause a problem. can also possibly fix this by doing a cooling system flush this will clear any blockages or expose the problem. if flush works, consider the thermostat. that also will cause no heat on inside.

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Q: How do you know if the heater core is broken on a 92 cavalier?
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