458 A/C compressor not coming on

If they reckon there's gas in the system, then (if) there's a pressure sensor/switch then yes that would be the next place to look. I'm not an expert with the 458 but I know earlier cars won't allow their compressors to turn on unless it senses pressure in the system.

If it's not that then it may be electronic or a wire may simply have fallen off somewhere.

I presume you can't hear a "click" when you turn the A/C on?

 

I’d find another dealer or independent mechanic and go there… you’ll need a gas recharge anyway.

 

It doesn't look the same because you looked up the wrong part.
This is more along the lines of what you will need:
https://www.ricambiamerica.com/80552400-pressure-transdu.html
https://www.scuderiacarparts.com/part-finder/ferrari/458/oe/22/2542/48672?h=38610 (Part# 21)

As others said, you will need a shop to do it anyway, because you have to recharge the refrigerant. I would also replace the dryer. I like to replace it any time the A/C system is opened up. It's #1 in the diagram, and it's only another 40 bucks

 

@FerrariCognoscenti - I continue to watch with interest, admiration and respect your fearless DIY approach to Ferrari ownership- Kudos

 

I would say that you absolutely could! AS LONG AS you have the knowledge to do it correctly.
I had a leaky line on my 2000 Xterra. I replaced it myself, and used a cheaper set of gauges (probably from Harbor Freight), along with a really cheap Vaccuum pump (it wasn't even a true pump, it created a negative pressure by hooking up my compressor air hose to it (Berulies principle). I replaced the a/c line, the drier, then added oil that was lost. I vacuumed it for about an hour, then charged the system. It worked flawlessly for at least another 4 years (I sold the car so I don't know how much longer it worked after that).

So the short answer is YES, as long as you vacuum it properly, and charge it to the correct amount.

 

I agree, It's not rocket science. As long as you educate yourself, and understand how it works, you should be fine. Of course, you need to check the shop manual for specifications as well.

 

I put together a whole car engine body etc ALL of it. However i went to a local A/C repair guy to recharge it. Some things IMO are better left to those that do it day in and day out.

 

I used a 70 dollar ac pro with the gauge. worked great ac blowing colder than ever

 

I would also recommend that you replace the dryer if you could. Technically, you are supposed to replace it every time the system is cracked open.

 

I would start from the basics 1st. Check all fuses and relays related to the a/c system


Sent from my iPhone using FerrariChat.com mobile app

 

Does the engine rev about 500 rpm higher when you turn the air con on ?

 

I had kind of the same issue on my second 458 in 2019 when on a hot summer day in Sweden it all of the sudden stopped blowing cold air.

After having it on even though it blowed hot air for around 700 km, when parked on idle it started to smell like someone was barbequing.

Unfortunately I found out that my AC-compressor started to burn (seems to be located just in front of the engine as you can see the smoke from my video) and I poured water in the engine-bay to prevent the whole car burning down.

Ferrari changed the ac-compressor shortly thereafter and it was good to go, but it was pretty expensive from what I can recall.

My advise, if you really want to drive the car right now --> DO NOT PUT THE AC ON

In my book it also says, use AC with moderation, lol only Ferrari can get away with such b*'¨****

Here is the video when it started to burn:
https://youtube.com/shorts/x7F3VlhF1sM?feature=share

 

I had kind of the same issue on my second 458 in 2019 when on a hot summer day in Sweden it all of the sudden stopped blowing cold air.

After having it on even though it blowed hot air for around 700 km, when parked on idle it started to smell like someone was barbequing.

Unfortunately I found out that my AC-compressor started to burn (seems to be located just in front of the engine as you can see the smoke from my video) and I poured water in the engine-bay to prevent the whole car burning down.

Ferrari changed the ac-compressor shortly thereafter and it was good to go, but it was pretty expensive from what I can recall.

My advise, if you really want to drive the car right now --> DO NOT PUT THE AC ON

In my book it also says, use AC with moderation, lol only Ferrari can get away with such b*'¨****

Here is a link to my video if the attached file does not work.
https://youtube.com/shorts/x7F3VlhF1sM?feature=share

 

Well if the revs go up its obviously getting a signal. The other part of the HAVOC system is the heating. There could always be the chance that when the air is turned on its not closing the valves on the heater core.

Generally speaking there is an electronic control box for that. Usually under the dash.

I mention this because when I was building my MR2 getting the A/C to work was a PITA. It was finally determined that because of different wiring to the original engine this electronic box wasnt getting the signal.

IMO best people to see is a very experienced A/C auto mechanic. Thats who diagnosed my MR2 and fixed it . Toyota had no idea.

Edit

I should also point out every part of the engine was new. So I was 100% the compressor was ok as it was new.
Also a very experienced A/C auto mechanic can easily see if its your compressor. They generally have an electrical clutch to engage so even though the revs will go up maybe it doesn't work