How do I fix my no heat situation on a Mercury Sable?

Answer 1

Start with the "Related Question" below - this is an excellent starting point to extensive coverage and information on Taurus/Sable heating & cooling problems and fixes.

AnswerI had a similar problem and it turned out my heater core was completely clogged, I recommend flushing it yourself as it will take a few hours of labor but is quite simple. Buy a flush kit and flush it out a few times with water. I used hot water from a water heater in the basement and an air compressor b/c my coolant hadnt been changed in years. AnswerYES THERE IS A HEATER DOOR MOTOR ON TOP OF THE TRANSFER CASE FOR YOUR AC AND HEATER IF YOUR AC WORKS BUT NOT YOUR HEATER IT IS LIKELY THIS IS THE PROBLEM? AnswerThe first, simple step is to check your coolant. If it is low, check the coolant reservoir for leaks. Then add coolant. If that is not the problem, there are other things you can try. The cooling system on these cars are notorious for getting clogged. Flush your radiator and see if that helps. If not, check the two hoses leading through the firewall to the heater core (Under your dash). Run the car with the heater on and see if those hoses get hot. If they do not, the core may be blocked. You can flush the heater core with a water-hose connected to the hoses to the core. Make sure to run water both ways and flush the heater core till the water comes out clean.

If that does not work, check the thermostat. It could be stuck...but more likely it is one of the vacuum hoses or the bender door inside the dash. Check the vacuum hoses first, they are not difficult to replace.

Answeryou have an air lock you have to purge the system buy letting it run with the rad cap off it will work itself out be sure to top it up!......rosdale joe AnswerCould also have something to do with the temperature blend door, the motor that drives it, or even a plugged heater core.

Read through the "Related Questions" below for much more information and diagnostics, along with some fixes to the problems.

What do you mean by not work?If you are talking about it not putting out heat, then your thermostat is probably stuck open or the heater core is partially clogged. In either case replace the thermostat, and flush the cooling system.

Now if you are talking about the blower motor not working, then it is either a blown fuse, defective blower motor, bad blower motor resistor pack, blower motor switch, or bad wiring.

AnswerHeater core may be "air bound" and needs to be bled. Heater control cable may not be working Answeri think your temp controls are stuck, there is a door inside the heater that controls whether you get heat, a/c, or vent air. it is probably stuck in a/c position and wont let heated air in but is clicking because it is trying to open. AnswerCheck your engine cooling system. Now. The heater runs off of the cooling system by using hot coolant from the motor to heat the cab. If your heater has failed it could be that you are low on coolant or your pump has failed. If either is true you can crack your block by driving the car.

Now of course things probably arn't so dire. You may have a vacuum leak in the control system or a stuck air door. However, it could be a major problem that could wreck the car.

Try the simple things first: the thermostat.For example, thermostats are designed to fail open.That means they always circulate coolant for cooling and the temperature of the coolant never reaches the level required to heat the auto interior. The coolant that flows through the heater core, which is a like a mini-rad for the interior, never has coolant hot enough running through it to throw heat, when the fan is on.A new thermostat will close, in time, to allow enough heat build up to give the heater core hot coolant, which gives off heat to the interior, when you turn your heater fan on.

Either the heater core is clogged or the heater temperature control valve is defective.