my heater blower was working fine and all at once started making a roaring noise on 2007 Dodge Caliber

i turned the blower up on high and it sounded like it blew something loose and was doing fine but every now and then it roars and i can feel the vibration in the steering wheel when it is on high

by in Monterey, TN on September 07, 2012
2 answers
ANSWER by on September 07, 2012
. Check the blower motor speed control wires at the HVAC control panel on the C2 connector. The Blue wires with colored tracers are the control wires, grounding them one at a time will provide a different speed for each wire. The Black wire is the ground for the blower motor circuit. If jumping the Blue wires to the Black wire one at a time varies the blower motor speed, the HVAC control panel is bad.
ANSWER by on September 07, 2012
WILL NEED TO REMOVE BLOWER ASSEM. AND CLEAN OUT FOREIGN MATERIAL TRAPPED IN BLOWER / HEATER BOX. BLOWER FAN OUT OF BALANCE WILL VIBRATE DUE TO OBJECT IN FAN WHEEL.,