2007 Chevrolet Impala rapping noise coming from dash

Tiny
VE77ER
  • MEMBER
  • 2007 CHEVROLET IMPALA
  • 3.9L
  • V6
  • 2WD
  • AUTOMATIC
  • 59,500 MILES
With heater on high I hear a rythmic rapping noise from the dash it goes away when I dial the thumbwheels down a bit however, with the heater off and the thumbwheels at lowest setting it persistintley happens I was told this could be a problem with the heater box actuators and was wondering how to narrow it down as there are about 4 actuators in this suystem.
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Tuesday, February 25th, 2014 AT 3:25 AM

1 Reply

Tiny
HMAC300
  • EXPERT
One actuator is for modes meaning heat defrost, one for temp or blend and the other two for lh an drh so try different positions it may be the blend door though
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Tuesday, February 25th, 2014 AT 6:42 AM

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