AC suddenly stopped working

fryzia23

Most common problem with no AC is lack of refrigerant. And this is where you should start diagnosing AC. Id start with checking at th condenser through the front bumper using flash light. If you see any darker circled spots, there’s a leak. Look closely as they can be very hard to get spotted.

B&W_Evader

Easy stuff first...
Check if compressor clutch engages. Usually you will see a slight variation in RPM when you turn it on and off. Better to actually look at it.
Look at refrigerant tube routing for any damaged areas. Anything aftermarket routed close to ac lines are known issues.
After that worry about refrigerant. You should hear some knocking sounds coming from the compressor at idle if there's no refrigerant.
My first guess would be the compressor clutch fuse, next would be aftermarket parts damage.

Good luck, hope it's something cheap and easy.

From my experience in CA, the pumps/clutch should last about 15 years or over 200k miles. Yours seems too new to be going out.

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JSON

Thanks for the replies.

I don't have a manual, but I downloaded one from the forum, and the page with fuses didn't have specific info about which ones were where. I didn't see it in the FSM either. I looked at the labeling on the 3 fuse box covers, and nothing really jumped out at me about it being related to AC or compressor.

https://imgur.com/SI1FHMq

Can I just get the freon recharge kit from the auto parts store to check pressure/refill? I was googling, and some people made it sound you shouldn't do that on this car.

I definitely still hear RPM going up when I turn it on, as usual. I thought the pulley was turning fine, but I took a video, and I'm not sure if that whole assembly is supposed to rotate (the silver rivet isn't moving in the video), although I assume that the pulley is on a bearing sitting on that stationary part, so no?

I still need to take a look at the lines and condenser. I'm also trying to figure out which fuses I need to look at, because unless I missed something, the labels in the fuse boxes didn't indicate anything about AC compressor.

Here is the video - I was turning AC on and off.

https://youtu.be/Hm3omRVkUSc

SouthArk370Z

It doesn't look like the clutch is engaging but I'm not 100% sure (my eyes aren't what they used to be). You should hear a click/clunk from the clutch when it kicks in and the center part of the clutch will start spinning. There may be a power relay nearby - don't confuse the click from it with click from clutch.

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JSON

The pulley is spinning. I don't think I hear a click of the clutch engaging...but I feel like I've never heard it for some reason. Or my exhaust is too loud.

JSON

https://shop.advanceautoparts.com/p/...archTerm=r134a

https://shop.advanceautoparts.com/p/...rchTerm=ac+pro

Either should work, right? We use R134a, not R-12.

fryzia23

That should be good. And yes r134a

Wabbyy

i just bought the ac pro and it worked lol

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SouthArk370Z

The pulley spins whenever the engine spins. If the clutch is engaging, the center part will spin when the compressor needs to run. If the center part never spins, you have a clutch problem.

If the clutch is not working, check voltage going to the clutch. If the clutch is working, then check refrigerant charge, as per others above.

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Steering Lock Links - Search The370Z Bookmarklet - FSM @ NICOclub
Mankind has progressed past the need for war but we haven't evolved that far. - NachoMahma