If the blower motor just runs in hi or one of the blower speed is not working, then there"s a an excellent chance that the blower engine resistor assembly is bad.

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Thankfully, the blower motor resistor on her Ford explorer (Ranger, Mercury Mountaineer) can be checked v a few simple continually tests.

With the help of this tutorial, you"ll be able to test it and also say: ‘Yes, the blower resistor is bad’ or ‘No, the blower resistor is no fried’.

To help you in more knowing if this tutorial uses to your Ford Explorer, Ranger, Mercury Mountaineer or Mazda B4000, if your auto uses among the following blower engine resistor numbers, this tutorial uses to your vehicle:

Airtex/Wells 3P1368.Dorman 973010 and 973411.Duralast JA1506.Four periods 20321.Motorcraft YH1700.Standard Motor assets RU404.

Contents of this tutorial:

you can discover this accuse in Spanish here: Prueba: Resistencia del engine del Soplador (4.0L Ford) (at: autotecnico-online.com).

If the blower engine is not working at all, you must start by testing the blower motor first. The adhering to tutorial explains how to check the blower motor:

Basics the Troubleshooting The Blower manage Resistor

The component that renders it feasible for the blower engine to operation in the 3 speeds lower than hello is the blower motor resistor assembly.

If you have already removed the blower resistor assembly from your Ford traveler (Ranger, Mercury Mountaineer), you know that it"s consisted of of 3 resistors.

The function of this resistors is to minimize the amount of the blower motor"s present that"s passing v them through converting some of this existing into heat power (and boy does the resistor assembly gain hot!).

It"s this palliation in existing (by converting few of it into warm energy) that provides the blower motor operation slower than complete speed (HI).

The one blower motor rate that doesn"t rely on the blower motor resistor assembly is HI because the blower engine switch perfect this rate by totally bypassing the blower motor resistor assembly.

Usually, as soon as the blower engine resistor fails, the resistors room physically burned ‘open’ but not always. This is when knowing just how to continuity check the resistor assembly come in handy to find out if it"s good or bad.

Blower Resistor Circuit DescriptionsPinWire ColorDescription
1LT GRN/WHTM1 speed Input native Blower Switch.
2ORG/BLKInput from Blower Motor.
3BLKOutput to Chassis Ground.
4YEL/REDM2 rate Input indigenous Blower Switch.

NOTE: There"s a an excellent chance that the color of the wires described over DOES NOT match what"s ~ above your particular vehicle. This is no reason for concern since the circuit descriptions room the very same for every one of the Ford vehicles spanned by this repair tutorial.

TEST 1: check Continuity that The Blower Resistor

OK, to get your blower motor resistor diagnostic top top its way, the first thing we"ll carry out is to remove the blower resistor native it"s location (next come the blower motor) and also check the continuous of the individual resistors (that make up the assembly).

These are very basic tests (the just hard component is gaining to and removing the blower resistor assembly) and also in the test steps listed below I"ll present you i beg your pardon terminals you"ll be trial and error with her multimeter in Ohms () mode.

Before we obtain started permit me phone call you the it"s common for the blower resistor connector"s lock tabs to break. This is as result of the truth that the connector is made of plastic and is exposed physically come the heat that the blower resistor produce (when in use) and also exposed to warmth that the engine radiates (when running).

The tendency of the locking tabs is to end up being brittle (from the heat) and also to break once you unplug the resistor assembly. The an excellent thing is that you can buy the blower resistor connector and also replace it. You can uncover the attach to the connector in this section: wherein To buy The Blower Resistor and also Save.

NOTE: every one of the continually tests, described in this test section, are done on your Ford Explorer"s (Ranger, Mercury Mountaineer"s) blower motor resistor and also not ~ above its connector.

OK, these room the test steps:

Visually inspect the problem of the blower resistor"s coils and it"s electric connector.Is the connector melted? room the coils in one piece?

Probe terminals 2 and 1 v your multimeter check leads (see image above).Your multimeter must register a resistance of about 0.9 come 1.4 Ohms ( ).NOTE: See image 4 that 4 to determine the suitable male spade terminals to probe).

Probe terminals 4 and also 1 v your multimeter check leads (see photo above).Your multimeter should register a resistance of around 0.6 come 0.8 Ohms ( ).

Probe terminals 4 and 3 through your multimeter check leads (see picture above).Your multimeter must register a resistance of about 0.2 come 0.3 Ohms ( ).This test additionally test the continuous of the blower resistor heat fuse.

IMPORTANT: There"s a good chance the you won"t see specifically the resistance worths I"ve provided (on your multimeter). The crucial thing is for your multimeter to it is registered continuity in the kind a resistance value. If her multimeter registers OL (Open Loop), then the resistor is bad.

Let"s take a look in ~ what her test outcomes mean:

CASE 1: The blower resistor did not show continuity in among the shown tests above. Twin check that you"re trial and error the correct blower resistor pins and also repeat the test(s).

If her multimeter quiet does not show continuity because that those certain blower resistor pins (you"re testing) climate this test an outcome confirms the your Ford Explorer"s (Ranger, Mercury Mountaineer"s) blower motor resistor is bad and needs to it is in replaced.

CASE 2: The blower resistor passed every one of the continuous tests suggested above. This is an excellent and is the correct and expected test result that speak you the the blower motor resistor is OK and not the reason of the blower motor speed problem.

You have got rid of the blower resistor as bad on your Ford traveler (Ranger, Mercury Mountaineer). If you"re still having a blower motor rate issue, then I suggest that you do the following test.

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The following step indirectly tests the blower switch on the A/C Heater manage panel by bypassing the blower resistor with a jumper wire: test 2: utilizing A Jumper cable To Bypass The Blower Resistor.