ANSWERS: 2
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Your problem is most likely with the blend door. The plastic door breaks and "flaps in the breeze" slipping randomly from heat to AC. This is a common failure on the Ranger and Explorer and is an expensive replacement at the dealer. There is a repair kit on Ebay from HeaterTreater that addresses this particular issue, or check the web site at www.heatertreater.net.
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I would have a look at the thermostat even you have had it replaced. A many a man has put one of those in upside down. Blending door might to blame but because the engine never reaches proper temps I would look at the blending doors as a last resort. Mr. Bill
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