AC compressor doesn't turn on.

Not enough/no refrigerant in system due to a leak? The compressor won't turn on if refrigerant level is too low.

Bad pressure switch?

Bad AC power relay?

More ideas here: https://www.ferrarichat.com/forum/threads/77-308-a-c-compressor-is-not-kicking-on.71592/

 

I say maybe another tire kick. Just a little harder, until it stings a little.

 

Almost certainly needs a re-gas.

R134 contains molecules that are a lot smaller than those in the original R12, so unless you replaced every single hose and seal in the system its likely to be leaking out everywhere over time - and still will even if you did (it just may take slightly longer!)

Get someone to stick some pressure gauges on it & you'll soon know.

I'd expect to have to re-gas it every couple of years with R134 in it.

 

Also would be good to put a meter on the ac power and see if you get 12v. I noticed on mine the compressor wouldn’t engage even with pressure switch shorted. I measured the voltage on the ac power line grounding to the engine and showed 12v. However, grounding on the on the ac compressor was around 8v. I added a little ground wire from the compressor stud to the dipstick cam cover bolt. Compressor engaged and was able to fill the system.

 

I just went to have mine refilled today and had a leak in one of the NEW hoses... sigh.

I had tried avoiding buying gauges... I don't know why. But in any case I just bought a set of gauges and a vacuum pump on amazon for 100 bucks.

If you pull vacuum on the car and it doesn't hold you have your answer.

 

The new gas has smaller molecules which are easier to escape.

 

My AC technician included some additive when he charged my 308QV with R134 two years ago. It's still going well and hasn't leaked out. But he told me to regularly run the AC so to keep the additive circulating and stopping/reducing the leakage through the OEM hoses. Hope I didn't just jinx myself

 

It will have been AC/PAG oil. Standard practise.

R134 will still leak out eventually. It does on modern cars.

One of the issues with our systems that makes it worse is the compressor in the back with long runs of flexible hoses to get to the condensor/ evaporators in the front.

Those hoses will just bleed gas over time.

 

Yeah running those hoses the first time was a nightmare.

Now I could probably run them in about 10 minutes... very different animal working on an AC with a mid-engine car.

 

Any tricks to running them? I need to do mine soon as someone cut and spliced them at the compressor at some point. I did the heater hoses and brake booster vacuum hose on the other side in the past and those sucked…a lot. So I have been not looking forward to the AC ones, especially with the metal fittings on the ends of them.


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The only way to do it without wanting to kill something is to run some bailing wire down the length of the tunnel from the rear... not from the front.

You will have to pull the fuel tank. I've read where others have done it without this... in my opinion they got lucky.

Once the tank is pulled you will see (or should see) a small hole/slat under a metal plate that was just behind the tank.

Above that plate is a larger hole where the hoses come out. Since you have no hoses there won't be any, but you'll know it when you see it.

If Ferrari had left that plate off it would have made things easier... but I'm guessing it's there for a reason... I don't know what that would be but it's there.

Now snake your wire underneath that plate, and push it until it reaches the front of the car.

You will obviously have to have your wheel off of the front and the front wheel liner will need to be removed to reveal the tunnel.

Once the wire reaches the front of the car, take your hose and attach it to the wire by drilling a hole and tying it together. Don't try tape... it will come out and cause you frustration. Don't drill too close to the edge, it will likely break through the hose and cause you frustration. Give yourself a good inch and half and drill the hole.

Now you've got your hose at the front of the car attached to your wire which is running through to the back of the car.

Now simply pull the wire until the hose stops against that plate.

Do NOT try running the wire into the larger hole and "bending" it down and through the tunnel. It will get stuck... trust me.

Once it stops against the plate you should literally see the end of your hose.

Now, take the wire that you've pulled through that is still attached to the hose and THEN snake it up through the little slat at the bottom and into the hole above the plate (completing the "curve").

Now simply pull UP to get the hose to make the turn. This is where the tape would break, and the hole if it's too close to the edge would likely rip through the hose.

Those hoses are very stiff so they don't like to turn. But just pull up and if you've followed all the other steps you should see the top of your hose peek out above that plate... now grab the hose and you're done.

You'll need to cut the hose below where you drilled it or you will have a leak obviously because you now have a hole in the hose.

Like I wrote, I could do this job now in about 20 minutes max. To get to this point it took me DAYS of trying different methods. Including trying to do it with the gas tank in place... forget about that unless you are incredibly lucky.

 

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shuntez les 2 fils verts...si le compresseur demarre , vous manquez de pression dans le circuit...donc en premier, remettre du gaz!....have a good day and good luck...

 

Thanks! This sounds like what I did on the other side for the heater hoses. The heater hoses kept getting bound up inside the rocker as I tried to pull them through though. It was a lot of back and forth and coating the outside of them with dish soap to get them to slide through. I wonder if the thicker and stiffer AC hoses are a bit easier than the flexible heater hoses. So it sounds like you pulled everything through and then crimped new fittings on the hoses with them in the car? Was it easy to find the old style flair fittings?


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I'm not sure if you're asking me.

I did both sides with the same result.

The booster hose is the cloth braided style so not really adept to lubrication.

You won't be able to pull it with the connectors attached unless you get really lucky. It's hard enough to pull those hoses as just hoses.

I crimped the ends once everything was in place and measured.

It's more of a pain crimping the end on the compressor than the front just because of the angle, but it's not too bad.

Also only do one hose at a time (I assume you already knew that though).

The fittings I used came in the kit I bought, but they are readily available on Amazon.