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2010 Ford Flex A/C Woes

A/C cold on startup then stop

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2 replies to this topic

#1 OFFLINE   riskadverse

riskadverse

    New Flex Member

  • Ford Flex Members
  • 3 posts
  • Region:U.S. Southern Plains
  • Location:texas
  • Current Vehicle:2010 flex

Posted 07 July 2015 - 12:56 PM

HI ..ric here....

 

I have a 2010 ford flex with regular air,  not dual climate control. For last few weeks a/c blows cold at idle..but as soon as we go into the texas sun..and ambient temperature rises..ac does not blow cold.

I have done the following:

Purged old freon. Applied negative suction to -5 psi for 20 minutes,..recharged with 134a and noted low side at 50 when ambient temperature at  90 degrees outside.

I changed  out the evaporator ambient air temp sensor ..a new black one..and this did not correct the problem. Both a/c and coolant fans running upon turning a/c on. I now see where there is a pcm reprogram release ids 56.12 or higher.

 

Is there something else that causes the air to not work efficiently and is causing it to be highly variable  in its reliabilty a few minutes after startup ,..it almost feels like a vacuum cutout of the air as was common on vehicles when in passing or kickdown mode....any iedas after all these things have already  been done? is there a thermal expansion valve or some other sensor that  i should know about?

 

thanks ric



#2 OFFLINE   riskadverse

riskadverse

    New Flex Member

  • Ford Flex Members
  • 3 posts
  • Region:U.S. Southern Plains
  • Location:texas
  • Current Vehicle:2010 flex

Posted 08 July 2015 - 05:37 AM

Hi forum,

 

Well i found the fix to my own problem.

I figured that since the PCM computer is monitoring all these automotive systems...I decided to just purge the freon down to 44 ....and voila..I have had not intermittent A/C problems at near 100 degrees outdoor temperatures...so I guess even the cheapo A/c refrigerant bottles thay come with a gauge ....are accurate when they depict 45 as being upper greenzone or upper limits of charge......

Thanks for allowing me to post. I hope others will find this useful. thanks..ric


  • mmsstar likes this

#3 OFFLINE   riskadverse

riskadverse

    New Flex Member

  • Ford Flex Members
  • 3 posts
  • Region:U.S. Southern Plains
  • Location:texas
  • Current Vehicle:2010 flex

Posted 08 July 2015 - 06:08 AM

BTW, I used professional gauge set and fittings to apply suction and to refill. I just mention the 30 dollar refill bottles with gauges in case there is a do it yourselfer out there without proper equipment. But..it will require a suction device available on internet that acts as standalone suction device using ac current or a suction device that is inexpensive using compressed air from your compressor to create a vacuum..these are commonly available at your big online home delivery discounters....ric








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