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start the heater with the fan on lift the hood locate the blower motor and give it a tap if the blower starts the motor is getting worn . If it don't come on I would say the switch is worn
If I'm reading this correctly- your blower isnt working? the fan doesn't blow? If the blower comes on over hard bumps, probably the blower motor is bad. More common is blower resistor, but try to find motor & bang on it while switched on...if it comes on, the motor is bad.
There is a sensor on the side of your blower motor. When mine started acting up I took it to a garage and they told me i need a new blower motor and a new dash board panel. I took it to my "in training" gear head buddy and he replaced the sensor and everything worked fine.
the blower motor resistor relay are bad about shorting out and melting the connector causing a loose connection and when you hit it or a bump it'll make connection and work. look under the passenger side dash and you'll see two wires coming from the blower motor. trace those two wires to a little black box with somemore wires pluged into it and try to unplug the other connector that has about five wires coming from it. turn your key on and your a/c with the blower speed set on high, try moving those five wires if the fan blows and quits, then this is the problem. you'll have to replace the resistor and the wire connector.
what you need is a new blower motor. It is located under/behind the glove box. The reason that it comes on when you hit a bump is because it jars the brushes in the blower motor to make better contact then when you hit another bump it losses contact.
The Blower Motor Resistor is a common problem in your car but not for the problem you describe. When the Heat/AC won't blow on all speeds, the blower motor resistor is at fault. When air won't blow out of vents, bi-level, or floor the problem is the blend door actuator. This is vacuum driven and diverts the air to where you select. When air will only blow from one place (usually the defrost) then the blend door actuator is the problem. This can sometimes be corrected if there's a vacuum leak (usually under the hood in front of the passenger you'll find the vacuum line and can trace it backward to find a leak). If no leak can be found, the blend door actuator itself is defective and needs replacement.
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