Question about 2002 Mercury Sable
Yes that is very possible and quit common. Just be sure your engine temperature is running in the normal range, if so and possible, access the two heater hoses were they enter the inside of the car (behind the engine) and after the engine is warmed up to operating temperature feel both hoses they should be hot to the touch and also feel close to the same temperature. Also if you have had any recent repairs done to your car it is possible its has got air in the cooling system and low heater performance is a common sign of air in the cooling system. Be sure to rule out all the simple things first before condemning the blend door or blend door motor due to they are labor intensive and costly.
Posted on Jan 03, 2011
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Posted on Jan 02, 2017
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Feb 05, 2016 | AC Cars & Trucks
Temperature Control Blend Door Failure No Heat
In all modern cars there is a tiny DC electric motor driven gear drive that moves a plastic door that blends heated and cooled air from the AC and the heater core, this is called (interestedly enough) the air temperature control blend door actuator. The motor that moves this door fails because the door starts sticking from warping, most common complaint is no heat but it can be no AC as well. To replace these parts (blend door and blend door actuator) you must remove the entire dash from the car. Always have this problem confirmed by a dealer or qualified repair shop as it is a very expensive repair.
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