Question about 2003 Ford Taurus

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Both Heat and AC blow the same air.

2003 Ford Taurus (Centennial Edition)
3.0L V6 DOHC

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
  • 21,873 Answers

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.
All of these components and circuits may need to be tested to find the problem. And yes the dash could need to be removed to access some of those components.
As long as the shop guarantees the repair will fix the problem, you should be safe. A dealer will have the most to lose if you blast them in public for not fixing it. A small garage, not so much.

Posted on Jul 23, 2013

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http://whatisbyme.blogspot.in/2012/05/2000-toyota-avalon-no-heat-on-passenger.html

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http://technoanswers.blogspot.in/2012/02/no-heat-on-oldsmobile-silhouette.html

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http://schematicsdiagram.blogspot.com/2011/12/heat-blows-cold-on-drivers-side-and-hot.html

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http://repairhelpcenter.blogspot.com/2012/01/hot-air-on-drivers-side-vents-only.html

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