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Old 08-31-2013, 07:57   #1 (permalink)
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Poor AC air flow after running - 2008 taurus limited

I have a weird AC and or air flow issue on a 2008 Taurus Limited. This has the dual zone automatic control.
On hot days (above about 85F), we noticed the air flow seems to stop or barely come out after driving a period of time…say about one hour. This is Auto or Manual on the control. You can turn up the fan and hear the blower increase but barely any flow anywhere. It sounds like it is blowing somewhere but not out any of the vents. We tried
• switching between vent, defrost, floor and still barely any flow
• turning he recirculation off and on
• turn the system off and on
Nothing helps once it reaches this point. The AC is working because the little air that come out is cold. He outside temperature looks correct. The only thing that has helped is to shut the car off and wait a period of time. I looked at the blend door actuators and the gears are in place and you don’t hear any clicking when the problem happens.
I took it into the dealer and the AC checked out, plenty of Freon, etc… they told us to bring it in when it happens again. Only problem is it tends to happen when we are on a trip and usually out of town.
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Old 08-31-2013, 08:01   #2 (permalink)
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Re: Poor AC air flow after running - 2008 taurus limited

Maybe it's not cycling and the condenser is freezing up.
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Old 08-31-2013, 08:05   #3 (permalink)
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Re: Poor AC air flow after running - 2008 taurus limited

Checked cabin filter ?
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Old 08-31-2013, 09:51   #4 (permalink)
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Re: Poor AC air flow after running - 2008 taurus limited

It sounds like the evaporated core is freezing. Ill check but I believe it has an evap temp sensor that would shut down compressor to thaw the evap.


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Old 08-31-2013, 09:57   #5 (permalink)
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Re: Poor AC air flow after running - 2008 taurus limited

"The evaporator discharge air temperature sensor contains a thermistor. The resistance of this thermistor varies by a specific amount based on the evaporator discharge air temperature. The HVAC module measures a voltage ratio between the reference voltage it supplies to the sensor and the sensor return voltage to determine this resistance and the associated discharge air temperature.
The evaporator discharge air temperature sensor maintains evaporator core temperature and prevents icing of the evaporator core. It does this by signaling the HVAC module to switch off the A/C request signal to the Instrument Cluster (IC) when the evaporator discharge air temperature sensor reading falls below acceptable levels. The A/C request will be switched back on when the evaporator temperature rises above acceptable levels.
The evaporator discharge air temperature sensor can be accessed from below the LH side of the instrument panel to the right of the accelerator pedal. "



No way to monitor without scan tool but a very good possibility. maybe remove it and look for signs of corrosion.

Last edited by r-clar; 08-31-2013 at 09:58. Reason: added to post
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Old 08-31-2013, 10:47   #6 (permalink)
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Re: Poor AC air flow after running - 2008 taurus limited

Quote:
Originally Posted by Bert View Post
Maybe it's not cycling and the condenser is freezing up.
I meant evaporator.
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Old 09-01-2013, 20:26   #7 (permalink)
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Re: Poor AC air flow after running - 2008 taurus limited

I already replaced the evaporator discharge air temperature sensor. This did not solved the problem.

I hear no clicking which might indicate a bad door actuator.

Could the evaporator be freezing or something? I had the car looked at the dealer and they could find anything but the problem was in place it needs to be hot and has to be driven awhile.
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Old 09-01-2013, 21:05   #8 (permalink)
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Re: Poor AC air flow after running - 2008 taurus limited

Yes the evaporater could be freezing. Would need to test while the problem is happening. Have to verify what the problem is,otherwise its just a guessing game


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