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A/C comp running while using heat

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Old Apr 13, 2015 | 09:24 AM
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A/C comp running while using heat

So I was doing my coolant flush yesterday and turned on the heat, both front and rear, to move any old coolant out of piping and cores. I notice that the rear was not blowing as "warm" as the front.

I did notice that the compressor was clicking on and off the whole time. A/c pipes coming off of accumulator were freezing up/getting cold/frosty.

Is it normal for the compressor to do this when the heat is on? If not, any troubleshooting tips would be greatly appreciated.
 
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Old Apr 13, 2015 | 09:25 AM
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If you had it on defrost, yes, the AC compressor will run.
 
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Old Apr 13, 2015 | 09:39 AM
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ALL cars do it to remove the humidity as not to fog up the windshield.
 
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Old Apr 13, 2015 | 10:43 AM
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The only two positions where the compressor does not run are floor and vent. All other run the compressor. I've been contemplating adding a cutoff switch. I know others have done it but the thread escapes me at the moment.
 
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Old Apr 13, 2015 | 11:02 AM
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Originally Posted by Archion
The only two positions where the compressor does not run are floor and vent. All other run the compressor. I've been contemplating adding a cutoff switch. I know others have done it but the thread escapes me at the moment.
Right. I actually found this out last year. I noticed the A/C ran when in the vent/floor position. I never use that position, but last year for some reason I set it there and noticed my feet were freezing.
 
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Old Apr 13, 2015 | 11:13 AM
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Thank you all for the replies. I knew that when it was on defrost that the A/C would run but didn't expect it in the other positions. It was in vent/floor for the front and panel for the rear. Next time I run it I will do just floor and see what the compressor does. Thanks.
 
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Old Apr 13, 2015 | 03:15 PM
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The only two positions where the compressor does not run are floor and vent.
One more. The third position is OFF.
 
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