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AC blowing hot air

34084 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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I was very lucky with my Civic in this regard.
It started last year that intermittently it would blow hot air when the a/c was turned on. I took it in twice to my mechanic (my dad is a pro mechanic but doesn't do a/c work) and both times they recharged and replaced my freon - of course it ran fine while they had her.. Anyways, as soon as it began to get hot here in Ontario, I gave it a shot and hot air again, but now it's ALWAYS hot air. I don't get a moment of a/c relief.

I came across this forum, read through past threads, did a ton of diagnostics and testing myself, and it all comes down to.. faulty a/c relay switch. $21 fix and I'm good to go. But seriously guys, before blowing $1500 at a dealer to get the compressor fixed/replaced -- check the relay switch. Pull out an identical relay, swap them, and turn on your a/c.
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