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I have a 1997 Mercury Sable that I just bought used, and is in very good condition.. except the heat doesn't work. The symptoms: car always blows cold air, no matter what I have the temp setting on. The dial that controls heat/ac/vent/defrost is VERY loose and doesn't "click" into any specific place, only sometimes does it "click" into something, making it difficult to control if anything is actually turned on, but even when I do get it to "click" into a position, the air is still cold, when I have the temp dial turned to hot. Also, the high/low dial only blows anything out on "high". I have checked the coolant, and it is filled to the appropriate level. But, being that I am a single girl - that is about all I know how to do. Through research on the internet, I have figured that it MIGHT be the "blend door actuator"... but the truth is, I don't even know what that really is. Any help would be greatly appreciated!!

Answers from the Automotive Experts

Amanda J. Pierce, MBA Rachel, Yes, by what you describe, it very well can be caused by a faulty blend door. The cable on the inside of the dash may have become broke or disconnected, for when you turn the dash dial the cable (blend door) moves right or left for cold or hot. This can be quite a laborious endeavor if indeed it is the blend door, the dash will need to be removed. Being that you only have high on your fan, it may be due to a failed diode in your blower motor.

Barb Petrey, President - DBK Enterprises Inc at Jiffy Lube This is not a repair you can do yourself. You need to go to a shop and have it diagnosed and repaired.

Gelina Aquilina, Service Advisor / Mechanic at Hey Rachel, that's exactly what I was thinking; blend door actuator. It's basically what controls the setting to change from warm to cold. Behind your vents are chambers that the air flows through. Each coming from a different direction, the actuator moves a "door" which blocks one side to send cold air out or vice versa. If it's not working properly, it could make noise or create issues like you're experiencing.

Helaine Kurot, Owner/Technician at 360 Automotive It sounds like either the actuator or the cable to the actuator is not functioning properly. The blower motor only working on high suggests that the blower resistor is no longer operational. Take the vehicle to a good repair shop. They should be able to confirm what needs to be done to repair the climate control on this vehicle.

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