96 Ranger 4 cyl. heater issue
Hi, new to this forum, hoping someone has heard of this issue : heat only works good when the truck is moving. When i start the truck in the morning and let it idle for a while, with the temp contol on hot, only cool air blows from the vents. When i start driving the truck hot air blows from the vents like normal. Sometimes when i am at a stoplight for longer than a minute the vent temperature starts getting cool again until the truck is moving again when the hot air returns. Any ideas ? I already replaced the "heater line control valve box.