Check the fuse for the blower motor. Also check the blower motor speed control. Its usually on the firewall on passenger side or mounted beside the blower motor itself. Has a plug that goes from it to the blower.
Check HTR - AC fuse and HVAC fuse.check blower motor. it could be faulty.
SOURCE: no heat/99 mercury sable
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
SOURCE: My heater on my 2001
I had the same problem with my sable. You need a heater blend door. The one on your car is stuck and wore out. The replacement part costs about fifty-two dollars, labor will be more like about one hundred dollars if you take it to a dealership.good Luck
SOURCE: 2000 MERCURY SABLE
My 2000 Sable starts blowing hot air about every 6 months. I mean like an oven. All I do is disconnect the battery negative terminal for about 5 minutes. After I re-connect the problem is solved. This solves many problems on this car, it just needs a re-boot. It must be powered by Microsoft (ha ha). Good luck. ps my auto headlamps never did work right either. Dave.
SOURCE: Where is the fuel filter located on an 01 Mercury sable ls
Part of the fuel pump assembly and a bit of a pain. You have to drop your gas tank.
SOURCE: Why does my 2001 Mercury Sable climate control only blow heat?
It could be the door that should be shuting off the heater core area is not shuting.The door works with engine vaccuum.The vac. comes from the intake manifold. With your car being a few years old, the heat from the engine may have caused the vac. hose to dry out and crack or become disconnected. With the engine cold and off, look under the hood. A small size vaccuum hose should be connected to the intake manifold and run inside the cabin area. This is one thing you can check. I hope this helps you.
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