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Ron, ASE Certified Technician
Category: Mercury
Satisfied Customers: 36046
Experience:  ASE Certs and Ford Certs
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Merc..mount..i turn heater on,a thud sound comes out of the heater

Resolved Question:

2003 merc. mount'. when i turn heater on,a thud sound comes out of the heater. No hot air. this sound starts as soon as the heat dial is turned away from the cold air position. the sound continues about once every second and a half or so. could this be the deflector baffle
Submitted: 6 years ago.
Category: Mercury
Expert:  Ron replied 6 years ago.
Hello and welcome to Justanswer,

My name is XXXXX XXXXX I am here to assist you with your question.

In most cases the noise you are hearing is caused by a bad blend door acuator and or in some cases the blend door is broken. The acuator has a plastic gear that is know to strip out . To know which has failed , you will need to remove the acuator to check the door. The bad news is the instrument panel has to come out to change eaither or both. see enclosed instructions.

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