Question about 2002 Mercury Sable

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Heater only blows warm air. I've been told that may be due to the heater blend doors. Might that be the problem?

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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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It is most probably the problem with blend door or blend door actuator. But just in case I would suggest to follow the entire procedure:

First you have to identify what causes the problem.
To do this you have to:
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