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Old 01-04-2016, 10:37 AM   #1
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Default A/c clicks on floor heat

on my 04 ,monte when I put on floor heater the a/c clicks on..if its under 40..which its supposed to do it does not..I have the snowflake button and its off..a/c goes on with defrost..which its supposed to..why would floor heat cause compressor to click on?
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Old 01-04-2016, 11:07 PM   #2
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When you turn to the "heat" position, the A/C clutch should not engage.....but in defrost it will turn on.....it will not turn on if the ambient air is below 40F.....
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Old 01-05-2016, 10:26 AM   #3
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ok why is it going on above 40? any ideas?
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Old 01-05-2016, 10:47 PM   #4
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I assume you have a manual system, and not an automatic one....

Do you have a button to activate the A/C? For example, when you have vent mode on,,,there should be no A/C....if you press the A/C on button it will come on? Does the A/C button light up when this happens?

If it does, does the light come on when you turn to floor/heat mode?

Also, depending on the year, if your recirc button is on, this may turn the A/C on also....
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Old 01-05-2016, 11:00 PM   #5
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yea the snowflake button is off,its not on recirc its an 04 monte..the a/c works on vent mode..if I click the button one click to the left its like mix floor and vent the ac goes off..its like a in between position..
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Old 01-06-2016, 08:25 PM   #6
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The PCM turns the A/C clutch on, as long as it is getting a good pressure signal from the pressure sensor(when temp drops below 40F, the pressure will also drop)....but it must get a Class II input from the A/C control head, to turn the clutch on......could be a control head problem....here is where a Tech II is invaluable.......it will tell you if the head is sending a request, when it should or shouldn't.....



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Old 01-06-2016, 09:06 PM   #7
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will get scan tool on it tomorrow..
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