Question about 1999 Mercury Sable

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No heat/99 mercury sable

I own a 99 mercury sable, and my blowers work but no heat. which fuse in the fuse box is the one that is for the heater? can anyone send me a diagram or let me know which one it is?

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  • Anonymous Dec 07, 2008

    I have some heat when the fan is on low...turn it to high and the air cools down and so does the heater core outlet pipe. I'm thinking it's the thermostat or the heater core plugged

  • Anonymous Dec 09, 2008

    I have the exact same problem. I find though if I rev the engine
    it starts blowing hot for a very short time.

    I just flushed the heater core, not much improvement.
    any ideas ---???

  • Anonymous May 01, 2009

    99 Sable My heater only blows hot air. Can't adjust temp.

  • Anonymous Mar 15, 2014

    my windows wont work and the inside lite wont work when something in or around the fuse box on my 2001 mercury sable

  • Anonymous Mar 23, 2014

    fuse panel diagram



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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

Posted on Nov 25, 2008

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It won't be the thermostat...Sable and Taurus have a design problem. The heater core hose going into heater core from water pump gets plugged up right at the heater core bypass junction. At Hardware store..Buy hard plastic hose/tubing about 4ft long that just fits inside of the heater core hose. My ACE hardware has white hard tubing. Cut one end of the hard tubing at angle to use it as a reamer inside the heater core hose. Now place the hard tubing on top of heater hose to measure the distance on hard tubing it has to travel up to firewall . Mark with black marker on hard tubing. Remove the heater core hose from top of water pump and slide hard tubing in hose all the way up to where the bypass connection is feeling the obstruction...rotating the hard tubing as you gently shove it thru heater core hose. Slide it back and forth and keep rotating it until you feel it go past the Bypass junction...10 min at least. Now take off the heater hose from engine on driver side that comes from the heater exit side...Use garden hose high pressure and back flush the crud out. Re connect hoses, add fluid to reservoir as needed. Or take to shop and have them do this. Many shops just back flush...Have them do BOTH! Buy the plastic tubing ahead of time so they have no excuse. I have been doing this on my 98 Taurus since 1999. Done many of these...You can also clamp off that bypass hose section with clamp or vice grips ..this will force all liquid to flow through heater core...remove clamp in spring! If you haven't changed thermostat for 4 years ...Change that as well. You tube has videos. Email me at I promise you hot air...from the car!

Posted on Jan 02, 2015

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I replaced the pump and thermostat still no heat so last on list is the core clogged. has to be or get new car.

Posted on Oct 24, 2011

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1 Answer

My blower motor dosent work on my 2005 mercury sable

Probably your blower resistor switch (it's the part that gives you your fan speeds) is bad. You can test your blower by applying 12volts to it and see if it spins. The blower motor and resistor switch are both under/behind your glove box. Both should be easily accessible after removing panel above feet.

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Could be the blower motor relay, the control panel on the dash, or the resistor.
You would need to check the blower motor for power and ground then work back to the fuse. I think the relay is in the box near the battery.

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Nov 25, 2008 | 1999 Mercury Sable

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There is a fuse panel under the dash on the driver's side and the maxi-fuse box is under the hood on the driver's side. If the fuses are good, it is probably the blower fan which is located under the dash on the passenger's side. (Behind the glove box.)

Oct 25, 2008 | 1999 Mercury Sable

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