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If the problem is a lack of air flow from the vents, and you suspect the blower motor is not running at times, you would need to test the blower relay and blower motor for power and ground when it is not working.
hello what i would do is try turnning the blower switch to a slower or faster speed you might have a bad blower speed switch also try tapping the switch knob if it comes back on replace the switch if it doesnt then simply turn the switch on and try to manipulate the connector plug at the blower motor mabye bad electrical connection if it turns on and off you may have to replace terminal ends at connector at blower motor. also you could use a test ligt at connector to check for power if it will light a test light it should run.