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Old 05-15-2013, 09:12 PM
tonyjklh tonyjklh is offline
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A/C trouble 2010 lariat

well now that the weather is warming up ive found out my a/c doesnt work very well. the air is cool but far short of COLD. at first i thought it might be low on r134, but now i dont think so. i hooked up the gauges(high, and low). added about half a can of r134. but no differance. 80 degrees outside low side pressure 25, high side pressure 230-250. adding r134 didnt raise the low side at all, just the high side. low side pulls down to 25 and after about 20-30 seconds there the compressor shuts off and then cycles again.

it sounds to me like expansion valve but id like any other opinions. i bought the truck in february so i dont know whether the a/c worked last year or not.
also where is the expansion valve located at? its not under the hood.
thanks for any help
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Old 05-15-2013, 09:43 PM
Going_Going_Gone Going_Going_Gone is offline
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My 2010 has had AC issues in hot weather from day one. The AC operation is tied into the PCM. Best fix for mine was a second PCM reflash (10-13-5) for cooling fan strategy. Still takes forever to cool down the cab, but the discharge air temperature decreased by five degrees after the reflash. As long as I don't have to ride in the back seat, I can live with it.
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Old 05-15-2013, 09:43 PM
 
 
 
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