Why would there be a clicking noise when the heater is on?

2004 PONTIAC SUNFIRE
70 MILES
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AIRJUAN2010
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The clicking noise only happens when the heater or air conditioner is on sound is coming from the inside not the motor
Mar 4, 2012 at 10:14 AM
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MHPAUTOS
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  • ASE Certified Mechanic
Does it increase with fan speed or is it a constant noise?
Mar 4, 2012 at 12:27 PM
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AIRJUAN2010
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constant
Mar 4, 2012 at 6:01 PM
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