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2002 Mercury Mountaineer- There is a loud tapping noise ...
Sent to Car Experts July 14 09:53 PM

2002 Mercury Mountaineer- There is a loud tapping noise with the rear air on and I can feel a tap on the plastic housing surrounding the rear heater core. The tapping does not change regardless of the fan speed What could this be? The air is working fine.

 

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2002 Mercury mountaineer 4.6

Customer (name blocked for privacy)
Status:  Closed   Value: $10
Answer
July 14 11:26 PM (1 hour and 33 minutes and 23 seconds later)
         
ACCEPTEDCheck Mark
Does it change from hot to cold. It sounds as if you have a broken blend door or blend door acuator. It you can not get any heat when you change the temp on the selector then the acuator of the blend door is the problem. I hope this helps
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