Question about 2003 Ford Taurus

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Both AC and Heat blow the same air.

Started some time in the winter. The heater started blowing air that felt like the air outside. Fortunately the winter was coming to an end and it wasn't a pressing matter, but as the weather warmed up and I began to use the AC, I got the same air I was getting with the heater. Some notes about operation, and what I've checked thus far: -Engine runs at normal operating temperature. Comes up to temperature quickly and NEVER overheats (thus ruling out thermostat). -Both hoses going from the Heater Core through the firewall heat up normally. -Compressor engages correctly when AC is on max. -Both high and low pressure readings were normal; refrigerant and anti-freeze are both clean and full. -Recently performed radiator flush & fill. -Used the UV crap to locate leaks. Found none. -Air blows normally from all ducts, and responds to adjustments in fan speed. -This particular Taurus has the automated/push-button temperature control, not the dials. My last 3 oil changes and tire rotations were performed at 3 different garages (on purpose). I had all 3 run diagnostics, and none pulled any codes. Each suggested completely different solutions, but none were different than the ones I, or someone else had already ruled out. I am getting exceedingly frustrated. I have to drive long distances on occasion, sometimes with my two very young children, and I hate trying to improvise climate control. I also have no interest in letting some mechanic tear apart my dash for 6 hours, charge me $800, and then potentially not fix the problem or find it could have been much simpler. I have yet to find anyone who can explain why both the heater and AC blow the same air, despite them being independent units. Can anyone help?!?! Thank you!

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  • Ford Master
  • 5,546 Answers

Sounds like a flow flap or vacuum control head issue. The system uses 1 blower motor and one fan resistor. Both systems are intergrated to produce a BLENDED temperature. This means that to raise A/C temps originating at say 20 degrees to come out of the ducts at 45 degrees for cooling you need airflow through the heater core WHILE the A/C is on.
This is done with a blender flap. Hot air that is potentially matching the water thermostat (165 degrees) is expelled to blend with the 20 degree air to raise the discharge temperature to 45 degrees and up.
In winter, the A/C is engaged by design to keep the compressor lubed with oil. Usually this happens in Defroster mode, but through either Design or defect, may occur in heat position.
Now some of the Digital Climate control units have a Diagnostic sequence you can activate with certain button pushing combinations. Research Your Model, Year and then Climate Control Diagnostics on the internet. The sequence is something Dealers know about.
This Diagnostics would identify a malfunctioning Flap valve actuator.
I recommend people to visit a Salvage yard which allows you to dismantle a car yourself and see how the car is built.
Hope this helps and makes sense to you.

Posted on Jul 23, 2013

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Posted on Jan 02, 2017

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michigan man
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SOURCE: 99 Taurus heater not working.

with the car idling put on glove and squeeze the upper radiator hose in your hand you should feel the surge of coolant if the water pump is working properly so if you do not feel this then it could be your water pump and also check to see when was last time the drive belt was changed

Posted on Jan 09, 2009

ifixgms
  • 64 Answers

SOURCE: Heater blows cold air.

heater cores clog in taurus. way to know is this--engine fully hot--heat on reach down to the fire wall and grab hold of one of the heater hoses where it hooks to the core--one should be real hard to keep hold of because its that hot. If the other is close to the same the core is not clogged. But if the other is cold to the touch its clogged. You can remove the hoses and shoot garden hose water in one side or the other and break it loose usually

Posted on Apr 07, 2009

  • 784 Answers

SOURCE: heater blows cold

If no coolant flowing through the heater core then ther is no heat. There are 2 possible root causes needed to check out: 1- THE VALVE TO CONTROL THE COOLANT FLOWING TO THE HEATER CORE IS NOT OPENING AS DESIRED. 2- THE HEATER CORE GOT CLOGGED UP AND NEED TO BE FLUSHED.

Posted on Nov 15, 2009

  • 518 Answers

SOURCE: 1999 Ford Taurus, no heat.

Try checking the two pipes that go into and come out of the heater matrix, is one of them hot? if it is there is an air lock within the matrix, Also is the thermostat opening fully? Sorry i know you said you have changed it twice already but take it out check settings when it should open and close, then boil some water and test the thermostat

Posted on Dec 30, 2009

  • 1 Answer

SOURCE: 1988 Ford F-150 4x4, the heater blows cold air,

I would try to replace the thermostate again, Sometimes these can get damaged in the warehouse. Cheap to try it again, $12-$15

Posted on Jan 04, 2010

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You are probably going to be at the mercy of a shop to get this fixed.
The climate control system uses an inside and outside temp sensor to decide what kind of conditioned air you need. There is a main HVAC controller called a Remote Climate Control Module and the engine and body computers also play a role in the process. Then you have blend doors that are controlled electrically that open and close allowing air to pass thru the heater and ac boxes.
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