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I just bought a 99 Ford Taurus SE 3.0 DOHC with automatic temperature climate control. When I got it the cold/hot blend door was stuck on hot and wouldn’t cool with the a/c on. I removed the blend door actuator. The door moves freely from hot to cold and you can feel the temperature difference out of the vents moving the blend door manually by hand. I bought a new actuator, which came out of the box with the control in the cold position. Installed it. Now it blows cold air but won’t move to hot when turning the temp all the way up. I removed the actuator, plugged it up and turned the temp up and down while looking at the control peg in the actuator. It doesn’t rotate at all even when it’s uninstalled from the blend door. Anyone have any suggestions, or would it be best to have someone with a high tech scan tool to check it out? Thank you for any input.
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If I understand you correctly:
The blend door actuator does not function when commanded.
My first thought would be check your fuses and ensure you have power going to the connector.
If I remember right, when the system is in “auto” mode and a cabin temperature is set several things occur ..
Heat or A/C is commanded on.
Blower speed ( if set in ” auto” mode ) runs at max till set temp is reached then adjusts accordingly
Blend door(s) swing to set condition.There is also a possibility the climate control itself is faulty.
That would require it be tested for it full functionality.Thanks for your input. I did some more research on the internet and found a thread that said you can read the climate control error codes by pressing off and floor simultaneously, then press auto button within 2 seconds. It gave three dashes and after about 30 seconds gave me trouble code 025-temp blend door fault. By pressing the front defrost button, it clears the code to 000 and resets the blend door. After I performed them actions the blend door is moving and adjusting from cold to hot appropriately with the temperature set.
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