Question about 1999 Mercury Sable

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No heat i own a 99 mercury sable, and no hot air comes from my heater. The blowers work but no heat at all. Ican tell that i am missing a couple of fuses but how can I tell which fuse is the one for my heat. please help, thank you

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Check you radiator coolant level

Posted on Nov 25, 2008

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If no blower is running check for a bad fuse for the heater blower or a bad blower motor and or resistor or burned connector to the blower motor

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1 Answer

I have a 2002 mercury sable that heater will not get hot. last year replaced a stopped up heater core and it was fine all winter. this year replaced thermastat and blend air actuator. its warm but not...


Since your blower is working and it is a heat issue,thats where we'll start,First thing is have you checked the coolant level in the radiator when engine is cold,make sure it is filled to top,next verify you have coolant in reserve ,Start your van and get it up to normal operation temperature,If your heat gauge on the dash works correctly it should be 190 degrees,Now lift the hood and locate the two heater hoses going into the heater assembly at the fire wall,Both hoses should be hot to hold on to,if both are hot and no heat inside your problem will be the blend air door in heater assembly.
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Hello. You are in luck. I just had this same issue in my shop this week. We changed the thermostat, and replaced the coolant. Fixed it right up. Since you did not mention a new thermostat, that would be my next move, if I were you.

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The blend door that regulates the airflow over the heater core may be stuck in the AC position. It is inside the case and is most difficult to get to. There may be a YouTube video that may help you locate it and test it.

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you have a broken or stuck temp blend door in the heater case. or the servo motor is broken. this sits on top of the heater case

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its not a fuse if the blower motor works , you have a clogged or bad thermastat, bad water pump or your radiator heater core is clogged

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