Why would the air conditioner work fine but the heater not work in a 1996-1999 Ford Taurus - Mercury Sable?
there are several things that it could be, the thermostat ($35), the heater core($150), or it could actually be the head gaskets ($110), or it can be a vacuum problem($30 Replace lines). the pricing is if you can do the work yourself, its parts only!
Another cause, especially with with ac working ok, is that the temperature blend door actuator / motor has failed.
This is a relatively common problem, and the repair is not too difficult. Autozone shows this part as only $15, and also provides an illustrated repair guide for the job.
See "Related Links" below
Why would the air conditioner work fine but the heater not work in a 1996 1999 Ford Taurus Mercury Sable?
If the windows of your 1996 Mercury Sable fog up with antifreeze moisture but the heat still works is this a bad heater core or poor drainage or something else?
Can having a heater coil replaced on a 1993 Taurus SHO 3.2L cause a working air conditioner to no longer cool?
Yes it is possible but you might want to check to see if you need freon..Or your air conditioner might need to be recharged... Yes - the specific thing that could cause this is a temperature blend door that is stuck in the heat position. This would cause nice hot air conditioned air. Check out the "Related Questions" below for more about Taurus heating/cooling problems.
Way up under the dash. Not for the faint-of-heart to get at. It is inside the heating/ventilation/air/conditioning - HVAC plenum. There are a couple of ways of dealing with a failed or binding temperature blend door - remove the dash, or cut your way to it. The instructions for getting access to it are the same as removing the heater core - at least it will get you directly in contact with it. See "Related…
Why does the air coming from your home air conditioner vents smell like stale smoke but not when your heater is on in a duplex where the other family smokes?
This has much to do with how the air conditioner and the heater is vented. If the air conditioner draws its air from outside it could be picking up air / smell of smoke from the other family and then redistributing it into your home. A heater on the other had usually has a heater input vent within the house it is heating (it draws the interior air in and then heats it blowing it…