2002 1500 4.7l. Why is heater fan operation erratic?
When I start my truck with my fob the heater fan will work just fine low medium and high. As soon as the 10 minutes time out and I have to restart it with my key my heater fan will not blow. Why will it work when I started with the fob but it won’t work when I started with the key and engage to drive?
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I assume that you are talking about the heater fan?
Your heater FAN has at least 3 settings, and for our purposes we will assume low,med and high
Low and medium run through a resistor High is wired direct Either your resistor is bad or your fan is I know it seems wrong that the fan could be shot but it could be pulling so many amps that it won't work in any other mode than high I just had this happen on one of my trucks Start with the fan
All cars are designed with a blower fan motor that pushes air through the ventilation system. This air is processed by a series of vents to direct the air to various positions. Example: heater, air conditioner and defrost modes. Most blower motors are power by a basic electrical circuit that utilizes a multi resistor or a solid-state resistor to control different fan speed modes (low, medium low, medium and high). If the resistor malfunctions it may lose one or more of the lower fan speed settings.
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If the heater fan on your car only works on "High" the problem is more than likely the resister assembly in your blower circuit or poor connections at the resister assembly. When the switch is in the "high" position the current does not flow through the resister assembly it flows directly to the coil of the blower relay. When the switch is in "low", "medium 1", or "medium 2" position the current flows through 1, 2, or all 3 of the resistors in the resistor assembly which results in the 3 different lower speeds. Check the resister assembly and replace if needed.
after checking the heater core hoses they were both hot I went in to look at the blend door and noticed it wasn't moving on hot or cold so I simply disconnected the lincage and moved to hot and its working ok. but its not completely repaired