Heating
2 Answers
More info would be helpful. Could be anything from a clogged heater core to a bad radiator cap. First, check that your coolant is at the proper level. If good, then start working your way back through the cooling system and check sensors, thermostat, radiator cap, water pump, hoses (for clogs). If the trouble still is not found move on to the interior controls and their operation. Again, if you can provide more info, the solution may become clearer for those of us trying to help.
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