When driving the temperature gauge goes up in the red and then it'll go back to normal. While its in the red the heater blows cold air, and when its normal the heater blows warm air. could it be the
Some things imediately come to mind, low coolant level, air in the cooling system and a bad thermostat. The next is not so pleasant, blown head-gaskets. So do the easy stuff first and if that doesn't get it then move on to a block test.
Has this vehicle been using coolant?
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