Question about 1998 Dodge Ram 3500 2WD

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My heating/airconditioner blower only works on high speed, the other positions do nothing.

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  • Master
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You need to replace the Blower Resistor. High amperage can burn it out, so have the blower motor checked or replace it.

Posted on Sep 05, 2010

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  • Master
  • 439 Answers

You need to change the switch to correct the problem.

Posted on Sep 05, 2010

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emissionwiz
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SOURCE: Heater / Air only work when blower is on set on high

You need to replace the blower speed control module, it is behind the glove box near the b;lower motor.

Posted on Nov 03, 2008

  • 32 Answers

SOURCE: heat blower only works on high speed

replace fan speed reostat,generally high spd. does not go thru the reostat-full 12v service..kev-mn.

Posted on Dec 10, 2008

  • 1 Answer

SOURCE: HEATER BLOWER MOTOR ONLY WORKS ON HIGH SPEED

THERE'S A SENSOR UNDER THE PASSENGER SIDE OF THE CAR UNDER THE GLOVE COMPARTMENT YOU HAVE TO LOOK WAY UNDER JUST LAY DOWN ON TOP OF THE MATT IN FRONT OF THE PASS SEAT IT HAS 2 SCREWS ON IT UNPLUG IT THEN UNSCREW IT TAKE IT TO THE DEALER IT COST ME ABOUT 30 TO 50 DOLLARS BUT THAT WAS THE PROBLEM I HAD. GOOD LUCK

Posted on Apr 01, 2009

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The resistors provide resistance in the circuit, dropping voltage to the blower motor to slow the motor speed down. On high, the blower receives full voltage through the blower relay.

If you had High but no other speeds, then the resistor pack is usually the culprit. If you have all other speeds but high, the most common problem is going to be the blower motor itself, relay, or the switch panel.

You can check this by turning the fan speed to "high", unplug the blower motor, and check to see that you have roughly at least 12v at the plug. If you have 12v, that means the switch panel is activating the relay and the relay is working. Over time, heat kills the magnetic properties of the magnets inside an electrical motor. Without enough magnetic energy, you may not get enough opposing force to spin the rotor full speed when the windings energize, but still enough to spin at lower speeds.

Another thing you can check is the connector at the blower motor and the switch panel. Sometimes these will heat up, start to deform, and cause a bad connection. The bad connection may be able to handle the lower current draw on low speeds, but the higher resistance from the bad connection won't be able to handle the higher current while in the full speed position.

Hope this helps, keep me posted. be glad to help you get your heater working again soon.

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Well it sounds like the blower motor relay is out you might also need a blower motor if it is using to much juice on high speed then the blower motor is probabley about to go out and with the noise you are describing it sounds like a bearing in the blower motor is about to go out so probabley should change the blower motor and the blower motor relay.

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