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Hello, my name is***** you checked coolant level? What year, model, make, and engine size of vehicle? Thanks
If coolant level is full this would mean heater core is partially clogged or there is air in system. First try to burp air out of system to see if that helps, if not disconnect both hoses going to firewall and use a garden hose to flush it out from both directions. This would be about a $150 job to have done at a shop. Let me know how it goes or if you have more questions. Thanks.