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AC blowing hot air

34085 Views 21 Replies 11 Participants Last post by  Snowms3
The AC isn't working in my car. When I turn it on full blast and activate the AC it still blows hot air. The compressor seems to work (when I turn on the AC the rpm needle moves up).

I thought the system was low on refrigerator coolant so I got a can of coolant. The can was defective and kept telling me it had no coolant in it. I got a new can and it said the system was overcharged (around 700 psi). That is bad news.

Besides the compressor or coolant is there anything else that could be causing it to blow cold air?

my situation is just like this guys. Everything from the sounds to everything else. Also the compressor sounds like it's always running non-stop.

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There are a few conditions that will cause the compressor not to click on. It's rare that a conpressor goes out if the system hasn't been cracked open during the life of the car. Is it possible? Always. But in my experience it's generally something else.

As someone stated: check the thermal switch. It's there to turn off the compressor in the event it gets too hot. If it doesn't work it breaks the connection.

Also check the clutch gap. I'm not familiar with 8th gen civic a/c clutches but generally there is a manufacturer specified air gap tolerance. If it's too large the electromagnet can't pull the clutch in to allow the pulley to power the compressor.

Once again I'm not 100% experienced with these cars but check the a/c relay also. Rule out the cheap stuff before replacing the expensive stuff on a whim.

Normally, I'd say go oem, but compressors are way spendy. My Miata had a leaking one and I replaced it with a rock auto aftermarket one three or four years ago and it's still running strong. The price difference was almost $300.
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