Hello Ranger owners. I am dealing with and intermittent heater issue and could use your help. When starting from cold, it heats up ok then sometime later 5-10 minutes the air turns cold like it is just outside air. After about 1-2 minutes it goes back to heat and is good from then on. Confused and asking for any help you can provide. Thanks. Mikie

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2001 Ranger XLT 2x4 Extended Cab 3.0

Have you checked your coolant level. Possibility of airlock.