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CTMercuryTech, ASE Certified Technician
Category: Mercury
Satisfied Customers: 4976
Experience:  Lincoln Mercury Factory Trained
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2003 Mercury Sable: heat it only blows out on high..blower switch

Resolved Question:

I have a 2003 Mercury Sable. When I turn on the air/heat it only blows out on high. I just replaced the blower switch on the control panel and it did not fix the problem. What else could it be and how do I fix it?
Submitted: 7 years ago.
Category: Mercury
Expert:  CTMercuryTech replied 7 years ago.

Hello and Thank you for choosing Just Answer.


Before I can assist you, I will need to know:


  • Do you have manual or automatic climate control?
Customer: replied 7 years ago.

Manual, I guess....There is not like a temp guage that automatically turns on the air.

Expert:  CTMercuryTech replied 7 years ago.

Well to put it easier:


  • Do you have 3 turn knobs to control heat/fan speed/airflow direction?
Customer: replied 7 years ago.

Yes, The knob to the far right controls the setting, the middle one controls the temp and the left one controls the speed. I replaced the one that controls the speed.

Expert:  CTMercuryTech replied 7 years ago.

Ok Thanks. The problem you are having with the fan stuck on high is due to a bad Blower Motor Resistor. This resistor is about $40 and is located under the dash on the right side. You simply unscrew it and unplug the connector and replace with a new one.


Here is the removal procedure:





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