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Old 12-13-2010
Thread Starter
Join Date: Dec 2010
Location: Dekalb,IL
Posts: 3
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.
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Old 12-13-2010
Machine090767's Avatar
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Join Date: May 2006
Location: Minnesota
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welcome to R-F, B!
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Old 12-13-2010
Join Date: Mar 2010
Location: fenton,michigan
Posts: 14
i have the same issue, when i rev the engine the heat starts but it dont go out at stoplights... that part suggest to me either you have a bubble in the lines or low coolant
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Old 12-13-2010
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Try a radiator flush? mine used to take forever to heat up and i found out it was becasue my rad was full of crappy antifreeze (looked like Coffee) once i replaced the Rad and flushed engine it heats up a lot quicker
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Old 12-17-2010
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