If its blowing cold then either the climate control unit is bad or the heater core is clogged. . These are a bear to diagnose because the climate control needs to be removed to test.
Feel the heater hoses that go into the firewall. They both should be the warm. If one is cold the heater core is clogged.
If one is warm and the heater seems to work better with cruising then maybe the water pump impellers are worn out. The blades can corrode away.
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