A/C Compressor

**cowstandmoto** · 05-18-2014, 12:40 PM

Hey Guys. Been a long time. I finally got the beast running. Took it to GForce Performance in Pearland Tx. Got them to tune it and dyno it. Everything is great except the a/c................. For some reason the compressor won't kick on and blow air. I have replaced the little terminal that plugs into the fuse box. And the electrical connection on the body of the compressor it self is plugged in and in good shape. And I have also recharged it. So I don't really know what could be happening. Do any of you have any suggestions? I really appreciate it.

***SMWS6TA*** · 05-19-2014, 10:27 AM

Hate to ask the obvious question but is the ac serpentine belt on? I only ask because some dyno shops will remove it to remove parasitic drag.

Bear with me on these questions...

Does it blow air when you turn on the blower?

Have you tried turning it over to heat? Does it blow hot air?

Now turn back over to cold, any changes?

**cowstandmoto** · 05-19-2014, 11:00 AM

Hey Scott. Thank you so much for the reply. HA! It doesn't bother me at all answering your questions.

If they did take off the belt initially, they put it back on.

Ok, it doesn't blow anything out of the a/c vents. But I do get a very, very low volume off warm air coming out of those very small round vent on the dash and a little stronger air flow of warm air out of a vent under the dash.

Ok. I honestly never thought of turning on the heat. And then switching it back. I tell you what though, I will try that when I get home this evening.

**cowstandmoto** · 05-19-2014, 11:04 AM

Hey Scott. I think I better mention what I didn't say in the original post. I did say that I recharged the Freon. What I didn't say was that I put a bunch in.

***SMWS6TA*** · 05-19-2014, 11:32 AM

yeah if you over pressurized it or excessive oil then it will not work and could even break it or seals.

Did you use one of those DIY kits? with a gauge?

**cowstandmoto** · 05-19-2014, 11:35 AM

yes sir

***SMWS6TA*** · 05-19-2014, 12:03 PM

Yikes.....

Um...not much you can do now (legally) but have an ac tech look at. They will need to withdraw some of the freon to correct levels. Now the other nightmare scenario is you have water vapor in the system and it has frozen. If you have a leak chances are you have water vapor.

**cowstandmoto** · 05-19-2014, 12:54 PM

Crap.......

**Too Fast** · 05-20-2014, 02:42 AM

Best thing to do is have it evacuated and recharged with the correct level. If you put too much in, usually it will have excessive pressure on the high side and it will blow off thru the mechanical blow off valve usually located on the compressor. Scares the crap outta you the first time it does.

So, any change in the temp coming out the dash vents when you go from cold to hot? And I'm not sure if you airflow is changing mode when you select floor, or bi-level, or dash, or defrost. I usually use number 3 fan setting to test airflow. You are getting airflow, right?

***SMWS6TA*** · 05-20-2014, 07:29 AM

Dumb question but did you have any intake work done? I wondering if they disconnected the HVAC line by accident.

**cowstandmoto** · 05-21-2014, 10:16 AM

Hey Scott and Steve. Sorry for not responding sooner. I've been away and wasn't with the beast. I haven't had a chance to test Scott's suggestion to switch to heat and then switch it back. Sorry........ But I do have to check something when I get home this evening because, I decided to start it so I could get wood while listening to it rumble

So, when I open the door to shut it off, I think I might have heard the air blowing. Now I'm not sure. It didn't dawn on me until I was busy doing something else. And it was to late to check it last night. Now remember what I said in a previous post, there was nothing coming out of the a/c vents at all. So I will check on it when I get home. Hopefully it will be good news when I check back in later!!
Again I can't thank you guys enough for the input.

***SMWS6TA*** · 05-21-2014, 10:27 AM

ok, if you mean no air blowing out at all then that means something else. Check your fuses for a blown on the drivers side fender. Particular the A/C Comp Relay. If that is dead you'll get nothing.

There is also an A/C Cruise 15amp fuse in the same box. On the dash inside the drivers door look at the 2 HVAC fuses.

My money is on the relay. If the A/C Comp Relay and the Air Pump Relay are the same (I believe so) then just swap out the 2 and see if that fixes it.

**cowstandmoto** · 05-21-2014, 10:53 AM

Ok. I did replace the main a/c fuse in the fuse box on the fender. But I didn't know there was one in the instrument fuse box that's inside the car

**cowstandmoto** · 05-21-2014, 11:01 AM

I'm a little confused though. You say there are 1 or 2 fuses in the that fuse box that's inside the car?

***SMWS6TA*** · 05-21-2014, 11:08 AM

Sorry just one HVAC, the diagram I looked at was an older car.

**cowstandmoto** · 05-21-2014, 11:18 AM

Ok. Cool. And you think it is a 15?

**cowstandmoto** · 05-23-2014, 11:34 AM

Ok Guys. Sorry it took a while. First. I switched it from heat to cool, but nothing changed. And then, when I said I might have heard the a/c blowing when I leaned in the car to shut it off and it just didn't dawn on me until later. Well, that turned out to not be what I thought it was. When the engine is running, there is no air coming from any of the vents. But if I turn the key to the alt position, warm air comes out of the vents underneath the dash. So...... I don't know what to think