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Old 04-14-2012, 12:40 PM   #1
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Help plz! Heater makes Grinder noise when heat is on high

Hey. Out of the blue, i turned on my heat which worked the day before, started making a grinder kind of noise from the dash, around the bottom. It only works on high now. I also replaced the resistor not to long ago. It sounds like something is hitting the heater fan in the dash? Dont know. Id really appreciate some help. Thanks!

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Old 04-14-2012, 12:49 PM   #2
Knows a couple things...

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A bad fan motor draws excessive current (amps) which can burn up resistor packs, fan motor wiring, and/or fan speed switches. Since you've already replaced the resistor pack once and you're back down to one fan speed again, you've either got another burned up reistor pack, a burned up fan speed switch, or burned up wiring... all indicative of a motor that is on its last legs and drawing excessive current. Fortunately, the fan motor is easily replaced from the engine side of the fire wall after removing the battery.

The noise is probably from the fan motor but sometimes some type of debris can make it through the air vent under the cowling in front of the windshield and work its way down to the fan itself which might be making the noise.

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Old 04-15-2012, 11:41 AM   #3
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Yep as stated. And you'd be surprised what gets up into the blower housing.
Rodents love that spot to build their nests. I've pulled mice, rats, chipmunks, squirrels, even a snake out of em. And sometimes it isn't pretty as said animal get's nailed by the fan.

Pop the battery out and there's the bolts for the blower motor. Pull the motor and while it's out, take a flashlight and take a peek inside the housing for any foreign objects.
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Old 04-15-2012, 02:19 PM   #4
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I can't determine what year TJ you are running, but fan locations have changed over the years...If your fan isin't behind the battery, then it's inside mounted 180 degrees from the other style....Look right above passenger feet position and you will see it.
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Old 04-16-2012, 12:47 AM   #5
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Its a 1998 jeep tj 2.5... Its just weird that the 'grinder' noise, which sounds like its above the pass. Feet area...started at the same time that the fan only worked on high. I replaced the resistor like two months ago! Im going to open it up and let u guys know. Thanks a lot
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