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-   -   A/C compressor problem (https://www.lotustalk.com/forums/f313/c-compressor-problem-83617/)

BrokenR1 02-08-2010 01:17 PM

A/C compressor problem
 
I got done replacing the wiring going to the blower motor and made the old harness into a high (position 3) speed only connection for now. I'm going to make a little box for the new resistor pack and mount it up high for easy changing later if need be. I had the A/C evac'd before I did the work and now that I'm done I had it refilled. The fan works fine and you can hear and feel the motor change when I hit the A/C button but it doesn't get cold and the compressor doesn't kick in. Looking in from the right rear past the A/C line connects I can see what I believe is the compressor and can see that it does not engage at all. The A/C tech never saw a difference in the line pressure when we tried it at the shop either. So I went through and played with all the wire connections, 1 for the temp sensor thing inside the blower box area, two to some sensor near the drier in the front A/C lines, checked all the fuses, and the A/C button lights up. We put in 1.2 lbs or whatever the manual said.

Any ideas what else to check? I haven't put all the grills etc back on in case I have to pull the front clam again which I really want to avoid. So I have some what easy access to that area.

I've read about a tertiary switch that monitors the line pressure. I think that may be it. I lights on the buttons so I don't think it's the relay pack thing in the dash. Any way to test the tertiary thing is good or not? Should I have the shop redo the evac/refill or can they measure actual pressure? Maybe change the pressure?

SirLotus 02-08-2010 02:10 PM

You could try bypassing the Trinary switch which will determine if it is faulty.
Also, if the Trinary switch is working, the pressure may be either too high or too low.
Permitted operating range is between 29 - 464 psi.
Michael

BrokenR1 02-08-2010 02:25 PM

Quote:

Originally Posted by TheViper (Post 1409671)
You could try bypassing the Trinary switch which will determine if it is faulty.
Also, if the Trinary switch is working, the pressure may be either too high or too low.
Permitted operated range is between 29 - 464 psi
Michael

Trinary, that's the word I was thinking of. That's the thing with 4 wires coming out of the bottom into two plugs and located on the A/C line near the dryer right? How would I bypass it? Plug the two plugs together? I've read about someone jumping the C4 fuse to test the compressor itself which I might try.

SirLotus 02-08-2010 02:35 PM

I believe you bypass it by joining the Pink to the Black, but I am not sure.
https://www.lotustalk.com/forums/f101...-advise-74579/
Michael
Quote:

Originally Posted by BrokenR1 (Post 1409674)
Trinary, that's the word I was thinking of. That's the thing with 4 wires coming out of the bottom into two plugs and located on the A/C line near the dryer right? How would I bypass it? Plug the two plugs together? I've read about someone jumping the C4 fuse to test the compressor itself which I might try.


BrokenR1 02-08-2010 03:14 PM

I jumped the C4 from another fuse spot and the compressor came on and got cold, gonna try and bypass the trinary at its connector now.

SirLotus 02-08-2010 03:39 PM

Be careful, I am not sure of the consequences.
You might also check all of your fuses especially C4 & F19.
The compressor is also controlled through the SPM.
Quote:

Originally Posted by BrokenR1 (Post 1409695)
I jumped the C4 from another fuse spot and the compressor came on and got cold, gonna try and bypass the trinary at its connector now.


BrokenR1 02-08-2010 03:46 PM

Checked all the fuses multiple times already, then checked again anyways. It works when I jump that fuse spot with power from the driving lights fuse at C5. Tried jumping the connectors to the temp sensor as well as the trinary thing with no luck. could tell on a couple of them that the idle changed but the compressor never turned on. I had looked at the link you posted which gave me the idea of trying the jumping C4 part. On his the buttons would not light up so I think ours are different. I'm still leaning towards it being that trinary sensor since I just had the system evac'd and refilled. I think I'll try going back to the A/C shop tomorrow and having them put in 1lb to see if it works then if they can bumping it up .1 at a time to see if there's a difference.

SirLotus 02-08-2010 03:57 PM

The Trinary switch is controlled also by the ECU, so that ads another element.
Quote:

Originally Posted by BrokenR1 (Post 1409706)
Checked all the fuses multiple times already, then checked again anyways. It works when I jump that fuse spot with power from the driving lights fuse at C5. Tried jumping the connectors to the temp sensor as well as the trinary thing with no luck. could tell on a couple of them that the idle changed but the compressor never turned on. I had looked at the link you posted which gave me the idea of trying the jumping C4 part. On his the buttons would not light up so I think ours are different. I'm still leaning towards it being that trinary sensor since I just had the system evac'd and refilled. I think I'll try going back to the A/C shop tomorrow and having them put in 1lb to see if it works then if they can bumping it up .1 at a time to see if there's a difference.


BrokenR1 02-09-2010 12:44 PM

Went by the shop and had them take it down .1 and up .1 and nothing. I understand a static pressure a little bit more now though. Thinking a wiring schematic might help. Can we still download the manual for the $25 one month membership?

SirLotus 02-09-2010 02:21 PM

1 Attachment(s)
Yes you can, but just to help you out in your time of need ;)

BrokenR1 02-09-2010 02:31 PM

I've been waiting over half an hour and no email verifying my account for that site yet. Thank you but it's kinda hard to read. I'll probably get access whenever the paypal payment goes through.

BrokenR1 03-17-2010 10:17 AM

Figured out my problem last week. I had tried to test it with the front off, then got tired of waiting and put it back on but left the wheel liners off incase I had to remove the clam again. I finally got tired of trouble shooting and went to put the liners back on that were stacked up when I found that little box on the front right liner. Plugged it in and sure enough condensor and A/C work fine now. I had missed a couple little plugs there. Simple yet annoying. So in total I paid about $100 to fix the problem myself.

SirLotus 03-17-2010 01:18 PM

Which verifies my theory of ALWAYS checking the simplest thing first.
Glad you found the problem.
Michael

staggarlee 06-13-2011 03:02 PM

Quote:

Originally Posted by BrokenR1 (Post 1423229)
Figured out my problem last week. I had tried to test it with the front off, then got tired of waiting and put it back on but left the wheel liners off incase I had to remove the clam again. I finally got tired of trouble shooting and went to put the liners back on that were stacked up when I found that little box on the front right liner. Plugged it in and sure enough condensor and A/C work fine now. I had missed a couple little plugs there. Simple yet annoying. So in total I paid about $100 to fix the problem myself.

Do you happen to remember what the box that you missed under the right wheel well looked like? Or exactly where it was? I'm in the same boat as I got rid of my bad resistor pack and had my AC refilled by a shop. My AC light comes on blue but the compressor does not start.

I haven't tried jumping the fuses as I'm not exactly sure how to so that.

SirLotus 06-13-2011 03:34 PM

1 Attachment(s)
Quote:

Originally Posted by staggarlee (Post 1605867)
Do you happen to remember what the box that you missed under the right wheel well looked like? Or exactly where it was? I'm in the same boat as I got rid of my bad resistor pack and had my AC refilled by a shop. My AC light comes on blue but the compressor does not start.

I haven't tried jumping the fuses as I'm not exactly sure how to so that.

Here it is next to the fuse box.
Michael

staggarlee 06-13-2011 03:48 PM

Thanks! I have those two plugged in. I'm leaning towards either the switch pack module or a/c relay switch being the issue. I have no leaks and everything worked before I did the resistor pack delete. I thought I had just missed something but have now read all of the diagrams and it looks like everything is plugged in correctly.

LiveToDrive 01-26-2015 04:47 PM

49 Attachment(s)
Anyone ever resolved these exact same problems WITH the relay connected properly? I've been troubleshooting this AC for months now. Tried new relay (box with 2 plugs) and nothing. AC light is on, pressure is correct, but compressor won't kick on (well sometimes it will for only a few seconds). I'm one step from replacing the compressor, but that doesn't look easy and I simply don't have the garage space for removing the clam. Plus I doubt that's the problem this car has only 14k miles.

Help.

LiveToDrive 09-24-2015 10:36 AM

AC compressor has been replaced, but I still have the problem. I tried looking for the Trinary switch and I think I found it, but everything looks ok?

philethier 09-24-2015 10:55 AM

We have at least two threads running on this, but I will do the belt-and-braces thing here:

Sometimes when the AC is off, I push the AC button, it won't light and turn on the cold.

Sometimes when the AC is on, I push the AC button, it won't tun OFF the light and turn OFF the cold. When this happens, turning off the blower always kills the blue light and the cold.


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