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How do you diagnose a bad thermostat?

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How do you diagnose a bad thermostat?


Below you will find two interesting articles on a similar topic 👇

Why does a BMW overheat?

Can thermostat cause check engine light?

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FAQ for the last Day

  • What causes heater blower not working?
  • If little air is coming through the vents (hot or cold), then it could be because the blower motor for the fan or a switch or resistor that controls fan speed isn't working. Another cause might be that the electronically controlled “blend doors” that direct air flow are stuck or broken.Wait a few minutes to see if your furnace cycles back on and the blower starts once again. Sometimes the furnace...


  • How do I reset my AC blower?
  • Locate the reset button on the furnace and press it to reset the furnace. It is usually located inside the blower compartment on the side of the blower motor. Be cautious as the housing may be hot. If the button is popped up, press it down.Turn the unit off with the help of your thermostat. Find the back of the air conditioning case – the reset button is located at the bottom, near the copper line...


  • What does a blown fan fuse look like?
  • Look at the fuse wire. If there is a visible gap in the wire or a dark or metallic smear inside the glass then the fuse is blown and needs to be replaced.Do fans have a fuse? Check the Fan Fuse Many fans — especially large, industrial-strength ones — are equipped with a thermal fuse for safety. Like the circuit breakers in your house, these fuses are designed to break the electrical connection whe...


  • What happens if blower motor relay goes bad?
  • If the blower motor relay develops any sort of problem that hinders its ability to properly limit and distribute power, it may cause the blower motor fuse to blow. Any sort of electrical spikes or excessive current from a bad relay will blow the fuse and cut power in order to protect the system.What happens when a blower motor relay goes bad? If the blower motor relay goes bad, the AC system canno...


  • How do I know if my blower motor resistor is bad or blower motor?
  • Signs of a Bad Blower Motor Resistor Loss of HVAC fan control (total or certain speeds) The fan only works on its highest speed setting. No air coming from vents. Intermittent or inconsistent fan speed.Will blower motor work if resistor is bad? If the resistor shorts or fails, it may cause the blower motor to remain stuck on one fan speed. The heating and air conditioning systems may still functio...


  • Where is the blower motor resistor?
  • The heater blower motor resistor is often found beneath the dashboard. It is located in the heater and air conditioning compartment. It's connected to the air conditioning system, where it can adjust the speed of the blower motor fan. It can also be found behind the glove box of some vehicles.Where is the blower fan resistor located? The blower motor resistor is usually extremely easy to access, b...


  • Why does my blower motor keep blowing fuses?
  • Blown fuses If the blower motor relay develops any sort of problem that hinders its ability to properly limit and distribute power, it may cause the blower motor fuse to blow. Any sort of electrical spikes or excessive current from a bad relay will blow the fuse and cut power in order to protect the system.If the fuse keeps blowing and you’re also hearing strange sounds coming from your furnace, t...


  • How does a blower motor relay work?
  • In a blower motor, the relay supplies the power that allows the fans to circulate warmed air. Essentially an on/off switch, the blower motor relay's reactions start and end the heating process in HVAC systems by controlling the flow of current between the power source and the motor.How do you test a blower relay? Connect a test light or multimeter to the ground (black lead). Turn the ignition key...


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