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Thread: A/C Stopped Working -- What to check? Reply to Thread
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  Topic Review (Newest First)
06-29-2017 04:50 PM
exigegus buy gauges

harbor freight

you need to trouble shoot the trinary, thermostat and switch pack to know
06-29-2017 03:39 PM
craigyirush My a/c stopped working. Compressor doesn't come on. Shop said it might be the trinary switch or the refrigerant is low.

Is there a way to check the refrigerant level without evacuating and recharging?
07-19-2015 08:34 PM
Twizzstyle Bringing a year old thread back from the dead.

My 05 Elise has had a problem blowing fuse #19 for a while now. I live in the pacific northwest, so most of the year it's no problem since I don't need AC, but we've been having a hot summer this year so it sucks not having AC.

Everything else on the system is fine - fan blows fine, plenty of refrigerant, etc. But when I replace fuse 19, the AC compressor relay fuse, it's good for maybe 30 minutes of nice cold AC operation before the fuse blows again.

Could it just be a bad AC compressor relay?
08-23-2014 06:17 PM
Doge I believe the 2006 and above a/c will remember if it was on or off last time you used the blower.
08-23-2014 01:56 PM
xxxotic My A/c stopped and I added freon (about 17 ounces) and the pressure is in the 30's on the low side and around 280 on the high side. The temperature outside was 100 degrees according to my friends point and shoot temperature gauge. I had the roof off and my friend aimed it at the vents and the temperature was around 70. Is this normal? I remember doing the AC mod and the temperature was around 38 degrees when I stuck a home indoor/outdoor temperature probe down the vent, but that was with the roof on and in the winter.

Also I replaced my switch pack and noticed that if I turn on the fan and then press the a/c button the ac turns on, and then it shuts off if I turn the fan speed dial off. If I turn the fan speed switch back on, the A/C switch light stays on and the ac comes on. Before it used to stay off and I had to press the button again to get the ac to turn on. Did they change something on the cars after 2005 since I am using a newer switch pack module?
08-22-2014 11:40 AM
glb Usually dye is added to refrigerant, so leaks can be pinpointed. Black light?

Only then would you know if the clam had to be removed.
08-22-2014 08:34 AM
David Craig My A/C worked well for 4 summers. This summer it did not blow any cold air.

My dealer topped up the refrigerant and it worked for a while but I think I have a leak.

My dealer said that to solve the leak they would probably need to take off the rear clam.

In Toronto, I don't really need the A/C so I've decided to live without A/C.
08-22-2014 08:18 AM
Doge
Quote:
Originally Posted by SirBedevere View Post
My A/C suddenly quit working. The fan worked, the little blue dash light lit when pushed, but the compressor didn't engage. Checked LotusTalk of course for guidance (thanks everyone) and checked the usual things. The solution was to add some 134A to the system. As the freon was added, the compressor kicked on and we're back in business. Just wanted to thank all who have contributed to this thread.
That means it leaked out somewhere. Time to start searching for a leak.
08-21-2014 03:22 PM
SirBedevere My A/C suddenly quit working. The fan worked, the little blue dash light lit when pushed, but the compressor didn't engage. Checked LotusTalk of course for guidance (thanks everyone) and checked the usual things. The solution was to add some 134A to the system. As the freon was added, the compressor kicked on and we're back in business. Just wanted to thank all who have contributed to this thread.
07-26-2014 06:14 PM
SirLotus
Quote:
Originally Posted by wilsonlimdf View Post
my new C1 fused again. what is causing it???
Certainly could be the resistors, however I would check the connection on the fan speed switch first.
Michael
07-26-2014 05:00 AM
jefrac
Quote:
Originally Posted by pixie View Post
The repair shop that I shall not name here tried to cook me!

Hooked up the connector and presto, cold air!
I had a strange situation with this relay. My compressor stopped working. After checking fuses, I unplugged this relay and found it had been hot in the spot you can see in the picture. After cleaning it up and making sure the contact there would be good, I plugged it back in and the compressor cycles again. Weird. Hopefully, the issue does not return.
09-13-2013 07:11 PM
wilsonlimdf
Quote:
Originally Posted by SirLotus View Post
Could be the resistor pack corroding.
michael
my new C1 fused again. what is causing it???
09-13-2013 12:25 PM
pixie
Uh yeah, there's your problem...

The repair shop that I shall not name here tried to cook me!

Hooked up the connector and presto, cold air!
09-07-2013 08:08 AM
SirLotus
Quote:
Originally Posted by wilsonlimdf View Post
Guys, it just happen that while driving halfway i hear a 'tak' sound coming from the dash and my aircon stop working all together. no light, no air, no compressor.
I found out that my C1 fuse had blown, replaced that and all is working again.

Just want to know since nobody mention C1.
What cause C1 to fused??
Could be the resistor pack corroding.
michael
09-07-2013 04:22 AM
wilsonlimdf Guys, it just happen that while driving halfway i hear a 'tak' sound coming from the dash and my aircon stop working all together. no light, no air, no compressor.
I found out that my C1 fuse had blown, replaced that and all is working again.

Just want to know since nobody mention C1.
What cause C1 to fused??
08-05-2013 12:00 PM
pixie I visually checked all of the fuses and even tested for resistance on the relevant fuses.

I did not see any electrical parts except the fuse box under the right 'hood'. According to other threads that module is attached to the front right wheel cover. I remember seeing it when I replaced the steering arms.
08-05-2013 11:13 AM
SirLotus Did you check fuse F7, C4, F14 and F19?
The AC/Fan control module is located next to the hood fuse box.
Michael
08-05-2013 11:07 AM
pixie Now that I know that's under the passenger side wheel liner, I'm wondering if I've used my air conditioner since April? That's when I had the oil cooler line recall done. Maybe they didn't connect it again...

Time to pull the wheel off. It's only 98 and a clear blue sky... maybe morning would be better.
08-05-2013 09:45 AM
chiarov Symptoms sound very similar to my problem, which turned out to be an AC relay pack (apparently it's 4 relays all together.) Sorry the receipt from my mechanic doesn't list a part number but he said this is something he was able to purchase from a local Toyota dealer, so it's a Toyota part.
08-05-2013 09:29 AM
pixie I've got another one. I live in Austin. So, this is an emergency! 100F+ all week.
Air comes out, but it's air temperature (hot!)

The compressor sounds like it comes on. (RPM change)
I checked all three fuses.
The blue AC light on the instrument panel comes on and stays on.
The recirculation light comes on
AC system pressure reads 100 on my meter. It reads this with and without the compressor/car on.
I can't even see the compressor to check the clutch is spinning. Can you see it if you take the tray off?

I did the speedometer reset just for fun. No change.

I haven't done so much as an oil change since the AC was working. So, I'm thinking bad compressor? I probably only use the AC 3-4 days a year even though I live in Texas. Just when the wife consents to ride in the Lotus. I hardly ever drive around with the top on. I just arrive looking like I just took a shower with my clothes on...

Is there anything else I can check to nail down this diagnosis?

I'm not looking forward to the cost of a new compressor. I'm pretty handy with a wrench if I have good instructions. Is there any chance of replacing it in-vitro? If there is, I might attempt it myself.
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