How do you test a control board?
How do you test a control board?
Place your meter probe on the circuit directly after the first resistor. Set your volt meter to the “resistance” setting. Power the board and make a note of the reading. The meter will signal a zero reading if the resistor has shorted or is not connected.
Where can I get a new blower motor resistor?
I replaced the blower motor resistor and the control unit with new parts from rockauto (ACDelco). I’ve checked the fuse in the dash fuse panel and it is good.
When to replace a heater blower motor switch or relay?
When the motor gets old and tired it will draw more current through the wires than a new motor. It may still draw enough current to blow the fuse after it runs for a while. In that case, a motor replacement is in order. Step 1: Disconnect the battery. Put on your safety glasses and disconnect the battery at the negative cable.
What happens when you change the fuse on a blower?
If the blower works when you change the fuse, you may not be out of the woods yet. When the motor gets old and tired it will draw more current through the wires than a new motor.
What are the signs of a broken blower motor switch?
Some common signs of a broken blower motor switch are if the switch only works on certain air settings, which occurs when a contact wears out, or if the switch is stuck or often gets stuck, indicating that the switch is not working properly.
How to test the blower fan control switch?
This is good and is the correct and expected test result that tells you that the blower fan switch (in the A/C-Heater control panel) is OK. Your next step is to bypass the blower resistor using a simple jumper wire. For this test go to: TEST 2: Using A Jumper Wire To Bypass The Blower Switch.
Can a blower switch be replaced in an A / C heater?
Replace the blower switch in the A/C-Heater control panel with a new one to solve the problem. To comparison shop for the blower control switch, take a look at this section here: Where To Buy The Blower Switch And Save. CASE 2: All circuits tested had continuity where indicated in the test steps.
Can a GM blower control switch be replaced?
This is no cause for concern since the circuit descriptions are the same for all of the GM vehicles covered by this repair tutorial. You don’t have to buy the whole A/C-Heater Control Panel to replace the blower control switch since the switch is removable. You can find the blower switch just about in anywhere.
Why is my blower control switch not working?
If continuity is not present where indicated in the test steps above and this lack of continuity coincides with the blower fan speed that’s not working on your pickup or SUV, then you’ve found the cause of the problem. Replace the blower switch in the A/C-Heater control panel with a new one to solve the problem.
