A/C no longer works. What can I test? - Mazda3 Forums : The #1 Mazda 3 Forum
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post #1 of 6 (permalink) Old 06-19-2019, 04:40 PM Thread Starter
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A/C no longer works. What can I test?

2007 Mazda 3 2.0L. Manual Trans.

Hello all,


Last year I was working on figuring out why my A/C would work for about 10 minutes and then die out. I changed the cabin air filter, to no avail. I checked the A/C relay, no difference when swapping with Horn relay.

https://www.mazda3forums.com/57-mazd...mazda-3-a.html

Now that it is warmer again after winter here where I live. I am deciding to take a look at this issue again, but now the A/C is not working at all. The A/C clutch is not engaging. I didn't have my manifold set to see the pressures from Low/High, but I did use a low side gauge that comes with refrigerant. It was in the Red area really high pressure. I assume that is because the compressor/clutch is not turning on. However, my light in the car is on for the A/C no blinks just solid green. The clutch moves when I turn it so it is not seized.

What can I test before I considering replacing the A/C compressor?


Thanks!

olorenzo

Last edited by olorenzo; 06-19-2019 at 05:02 PM. Reason: Missed some important info.
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post #2 of 6 (permalink) Old 06-19-2019, 11:22 PM
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Did you check to see if power is coming into the compressor?
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2011 3i 2.0 A/T 130K miles (daughter's ride which I maintain)
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post #3 of 6 (permalink) Old 06-20-2019, 02:18 AM
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if the clutch is not energising check the line pressure switch
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post #4 of 6 (permalink) Old 06-26-2019, 12:54 AM Thread Starter
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Quote:
Originally Posted by m3iguy View Post
Did you check to see if power is coming into the compressor?

I did today, test the connection that the compressor connects to, coming from somewhere above. I did get voltage when A/C button was on and when turned off nothing. So I assume there is power coming in. I tested resistance on the connection to the a/c clutch coil. On the multimeter I used I got a result of 1 Hmm...

olorenzo
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post #5 of 6 (permalink) Old 08-31-2019, 04:54 PM
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Is the ac light on the climate control unit coming on (green)? I have had two m3 and both had issues with the climate control unit AC on/off button.
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post #6 of 6 (permalink) Old 09-04-2019, 12:27 PM
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Don't forget to check the easiest thing first: the A/C relay. It's the same as the horn relay, and right near it in the underhood fuse box. Just swap them with one another, see if that fixes your problem.
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