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post #1 of 4 Old 04-05-2012, 11:21 AM Thread Starter
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Exclamation A/C stopped blowing

My A/C was working perfectly yesterday then all of the sudden it started sputtering for about 15 seconds then stopped blowing all together...when it started having issues it was blowing ice cold so I wouldn't think the compressor is the problem

Anyone have an idea of what it could be? I'm guessing it's the actual motor that blows the air

2008 F250 KR CCSB 4x4
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post #2 of 4 Old 04-05-2012, 02:48 PM
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It could be the motor but they are pretty stout, it is useually the a/c control module or the the fan speed reostat/thermosistor. You did check your fuses right and the a/c relay?


Lord I shall lead them to the water but I will not try to make them drink
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post #3 of 4 Old 04-05-2012, 02:52 PM Thread Starter
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Haven't checked fuses since it usually when a fuse blows something works then doesn't and this gradually stopped working. Don't know how to check the a/c relay...I don't really have any knowledge of a/c systems so any info helps lol. If I can't figure it out by Saturday I'm gonna take it to a shop

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post #4 of 4 Old 04-05-2012, 09:26 PM
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The quickest way to test the relay is swap it with another one of the matching relays, if the relay is bad whateverer you swapped it from will quit working.

The quickest test for the a/c contol module and the termosister, is unlug the lead to the blower motor and hook a dvom to the lead and cycle the contol switch. You should get battery voltage on high and then decrease incramentialy the slower speed you select.
If no voltage on any setting then the contoler is bad. If voltage is lost on any other speed it is probably the thermosister. To test remove the 2 screws and pull out the thermosister from the air box. It will have 3 elements of varing gauge wire. When voltage is applied they become like a heating element so do not touch with fingers you will get burned. The biggest wire is slow and the smallest is high. You should get 12vlt on one side and reduced voltage out the other when you cylce the control switch on each element.

A quick test for the motor is with a jumper wire touch the motor pin with bat voltage if it runs its good.


Lord I shall lead them to the water but I will not try to make them drink

Last edited by dannyboy950; 04-05-2012 at 09:38 PM.
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