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Blower motor only goes on high but low and med dont work at all

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Check and/or replace the power motor power module located oon the blower housing.

blower motor only goes on high - 5ba5a0f.gif

Posted on Jul 21, 2010


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1996 astro chevy van heater use to work on low and med but wont work at all now.

The blower resistor has gone bad which is why you lost blower speeds.This may have been caused by the blower motor drawing too much power. At this point I would verify that no fuses burned out and then check the pigtail plugs going to the resistor and blower motor to make sure the connectors and connections are not melted or wiring is frayed. These connectors are located in the engine compartment on the passenger side. After checking this and if everything appears ok then the blower motor itself has probably gone bad and needs replaced. I would also replace the blower motor resistor as well. If the connectors appear damaged replace or repair as needed .

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At first the heater in my cavalier 2001 was working on everything but the first two speeds on the heater (low, and low-med), now only high works. The med-high does not work anymore. I can hear something...

With the lower 2 speeds not working, it was the blower motor resister pack that is bad. It is located in the blower motor housing which is way up in the front of the passenger side footwell. The part itself it fairly cheap (online ~$30, ~$50 locally [if I remember correctly]) and shouldn't take more than an hour to do yourself. The blower motor housing is held together by 3 or 4 screws, and 2 more that hold in the resistor pack itself. The worst part of doing this yourself is that it's in an awkward position for one of the screws. As for the rattling, it could just be something within the housing (you'll be able to check and clear it out of so).

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Blower motor only works on high

your switch is bad more than likely but different settings send power threw the motor different ways so if one way shorts out another sometimes still works also if you have had a different blower motor put in some only have one speed if you just buy the cheapest one

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Have a 2003 Jeep Wrangler, Rubicon and the hear/AC blower fan only comes on in the high position. The other setting low, med and med/high the blower will not come on. Is this the controller it self?...

The problem usually stems with the blower motor resistor,high speed by-passes it and there-fore the controller is sending power but the resistor has gone open and the speeds can't be regulated.

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Your blower resistor is bad. It controls the mutiple speeds to allow you to go from low/med/high. When it goes bad you get one speed or no speeds....It's about $20-$50 at any local auto parts store. It mounted directly to the speed switch or on the heater plenum unit on the passenger side behind the glove box....

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