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AC immediately shuts off

 
Old 08-05-2015, 06:10 PM
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AC immediately shuts off

Hi all

I've searched the site before posting and have found similar problems but not exactly the same as mine

Many have had no blower with dead AC but my AC actually starts for a brief instant then immediately cuts off.

It appears to stay on as far as the temperature setting shows but the recirculating light is off and there is no compressor action or blowing.

Both fans under the hood both come on for that brief startup moment and then turn right off.

So basically it's the AC starting like normal but then turning right back off.

I've checked the fuses and relays and hope I haven't overlooked any but they all seem ok.

I'm stymied so any suggestions would be most appreciated!

Thanks!

Rick
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Old 08-05-2015, 10:43 PM
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Try the A/C on board self-diagnosis:
Name:  ACDTC_zpse4995f12.png
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Old 08-06-2015, 08:18 AM
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Hi Skirmich

Thanks so much for the quick reply!

I didn't know that test was available. I gave it a try but to no avail.

I followed the directions exactly and tried two different times but the temperature screen stayed blank and returned no codes.

Am I to assume the problem lies somewhere else since I got no codes? Any other direction you can point me in we be most appreciated.

Thanks for your help!

Rick
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Old 08-06-2015, 09:40 AM
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P or s model?

Does the heater work?

Before this happened was the ac running warmer than normal? If so then you're just low on freon. The system will shut down if freon pressure is below 28 psi.

Last edited by 01acls; 08-06-2015 at 09:45 AM.
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Old 08-06-2015, 09:44 AM
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Originally Posted by absoluteze View Post

I've checked the fuses and relays and hope I haven't overlooked any but they all seem ok.

Rick
How have you checked the relays? By multimeter or just by eye?
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Old 08-06-2015, 07:05 PM
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@01acls: Nothing happens with heater or high temp settings. No blowing at all but the selected temp still shows like its on but nothing is happening. Excuse my ignorance but I'm not clear on what you mean by P or S model.

AC was running cold and freon is full
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Old 08-06-2015, 07:07 PM
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@thoiboi: I checked the relays by swapping them since they appear to be the same type and everything else is working just fine with the car. Is there a better way to check and rule out relays?
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Old 08-06-2015, 07:54 PM
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Pressure Switche is located on the dryer.
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Old 08-07-2015, 05:27 PM
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Thanks for this latest batch of info! I'll give it a try tomorrow and report back
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Old 08-08-2015, 01:14 PM
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Ok gang here's my results thus far.

1. Tested voltage and got 4.9 so close enough.
2. Checked continuity between terminals on switch and there was no continuity
3. This took me to step 11 to see if pressure was in spec. I only have a simple gauge that came on a can recharge kit. Not sure how accurate it is. It shows more than enough pressure at 100. Mind you this is an iffy gauge and the ac has been operating just fine the past year so it's not been overcharged in that time.

So now my dilemma is do I assume it's within specs and replace te switch OR assume its not within specs and "repair the AC pressure problem ", whatever that is as what all it entails?

I feel like I'm zeroing in on the issue thanks to all your advice, now if I can get to the final solution I will be a happy camper again!

So what in your learned opinion is my next step?

Thanks again for all your help!

Rick
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Old 08-08-2015, 01:22 PM
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Q: the 100 psi reading... what was ambient temperature?
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Old 08-08-2015, 01:23 PM
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One more thing I meant to ask. Is there a way to bypass the pressure switch so I can engage the compressor and keep it going in order to get a proper pressure reading?

I think I read somewhere once that you can't get an accurate reading without the engine and compressor running. Not sure if that's accurate info though since I'm a bit of a novice.
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Old 08-08-2015, 01:39 PM
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Yes just jump/bridge the pressure switch connector... the blue/red and the yellow/green wires.

If the clutch stays on I would say you've found your problem but check the pressure readings to make sure it with in specs.

If it's low... add. If high... take to ac shop to recover the excess.

Do not run ac if higher than normal... you will damage the compressor.

Last edited by 01acls; 08-08-2015 at 01:45 PM.
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Old 08-08-2015, 02:06 PM
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Hot today, thus the need to get the AC fixed ��
Ambient temp is about 85. Reading was engine/compressor off.

Heading outside shortly to give it the jump test and report back with that reading.

I truly appreciate your help and patience!
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Old 08-08-2015, 02:08 PM
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That's about the right temp. Your switch is bad. Good job.
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Old 08-08-2015, 02:42 PM
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Just did the old jump with a paper clip trick but no luck. Same original problem still.
Turns on for a couple of seconds and turns right off.

So since I did the bypass does that mean the switch is good and the problem is elsewhere? It seems unlikely its low on freon with the reading I'm getting. It would be nice if that was the problem though since it's a cheap fix. I just don't want to toss more freon in and possibly overfill it

So close yet still so far
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Old 08-08-2015, 03:30 PM
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Lol duf.

No switch is ok then.

Check the following....


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Old 08-08-2015, 03:44 PM
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Check clutch relay fuse: # 58 (20A) under hood.

Activate the ac clutch by jump the relay wires red and white. If the relay is marked it will be terminals #1 & 2.
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Old 08-08-2015, 04:06 PM
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Year/model-premium or s type?
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Old 08-08-2015, 04:26 PM
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If all of above check out the move on to climate control.

Low on feon is still a possibility. Normally one would rule that out by vacuuming then filling to proper weight.
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Old 08-08-2015, 04:51 PM
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Wow, thanks man for all the new info. It just started pouring rain and I have no carport or garage to work under so I'll have to wait it out to try your suggestions.

By the way I'm in Florida and the car is a 2000 TL 4 door with NAV. Have questions about the NAV too but that can wait for another time

215,000 and still going strong though
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Old 08-08-2015, 08:18 PM
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Op did you check this thread out below...? Specifically item #3 & 4?

https://acurazine.com/forums/problem...ir-diy-775458/
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Old 08-09-2015, 09:29 AM
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Thanks I'll check that as well. I'm hoping it doesn't just address a non working blower that isn't pushing through the cold air from the compressor. I have nothing once the quick kick-on and kick-off happens.

With your most helpful advice I'll solve this mystery yet!
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Old 09-15-2015, 03:27 PM
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This actually just happened to me last week. A/C comes on for a split second, then off. The blower will not blow air at any speed. Diagnostic DTC shows indicator 'N' - problem in the blower motor circuit.

I'll just add it to the list..
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Old 09-15-2015, 03:31 PM
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AC immediately shuts off

Check the aC clutch relay..
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Old 09-16-2015, 09:05 AM
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Originally Posted by Chojun View Post
This actually just happened to me last week. A/C comes on for a split second, then off. The blower will not blow air at any speed. Diagnostic DTC shows indicator 'N' - problem in the blower motor circuit.

I'll just add it to the list..
See Post No. 22.
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Old 07-09-2019, 08:40 AM
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Originally Posted by 01acls View Post
See Post No. 22.
I have had the same problem. Took my mdx to a shop with a machine that vacuums and refills the freon and oil.

He had a probe that said the ac climate control was bad. I put another on and it still doesn't work.
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Old 07-10-2019, 01:01 AM
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You should try replacing the AC relay with another (same type) from the fuse box (swapping places). Also it could be a defective ac clutch. Assuming your ac is not low on freon.
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Old 07-10-2019, 07:26 AM
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Originally Posted by 01acls View Post
You should try replacing the AC relay with another (same type) from the fuse box (swapping places). Also it could be a defective ac clutch. Assuming your ac is not low on freon.
Are you about the relay under the hood?
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Old 07-10-2019, 08:33 AM
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Originally Posted by Russhood View Post
Are you about the relay under the hood?
Yes
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Old 07-10-2019, 08:48 AM
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Originally Posted by 01acls View Post
Yes
Thanks!
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