andoxviii

iTrader: (1)

I notice when I turn my A/C on that there is a significantly higher load on the engine...

When I clutch down to shift to the next gear, the RPMs drop much faster than when the A/C is off, which makes shifting smoothly much more annoying (although still possible if I shift a bit quicker).

When the A/C is on, it also feels like my Y7 is putting only 50hp to the wheels. I understand I should have a little bit less power, but the difference feels pretty significant.

Possibly unrelated, my A/C compressor pulley makes a lot of noise when the A/C is off, and shuts up completely when the A/C is on.

So I would like some input from other D-series drivers with A/C. How does your car run when your A/C is on?

Thanks guys



EDIT: My A/C works perfectly, btw.

ballisticej1

I have AC, and I don't really notice too much loss of power when it's on maybe like 5whp, but my car is boosted, not sure how much of a difference that makes. My compressor pulley doesn't make any noise at all.

Vindicator9000

How much noise? What kind of noise? It sounds like your AC compressor clutch may be on its way out.

If it's making a high pitched squealing when you turn the AC on, or accelerate hard with the AC on, I would inspect the clutch. Those are classic symptoms. It may not be a loud noise... yet... But, if you leave it go, it will eventually become a really loud metal on metal squealing as more of the friction surface is worn away. And, your AC will start losing performance.

My car has always felt *really* doggy with the AC on compared to other cars I've owned, but much more so when the clutch was going out. It's always been like that, even when I bought it with 7000 miles and a d16y8. Sometimes in the summer, I almost feel like punching the AC off is like hitting teh naaaaws, even on my B18C.

As to your revs dropping quickly - it will do that to a degree, as your AC belt runs directly off the crank pulley... but I've never really noticed it enough to think it's a problem. Do you have a lightened flywheel? It could be some kind of idle or throttle body problem... I've had a dirty throttle body cause all kinds of ******* issues that are 10x worse in the summer with the AC on.

rick_rabies

new belt? new pully? lube the pully? correct belt tension?, too much tension?
get good grounds? add another

joshsayswhatt

I have ac and it has no problems. My pulley used to squeak a little but I just put some grease on it and it doesn't make any noise now. A minor power loss but I do notice a difference in shifting. But same thing with my mustang. Just does that I guess. But it was never looked opon as a serious problem.

98civdx

my car is a slug, when you first start moving but the goes like normal, after a couple seconds,
not sure what the noise is, mine is quiet when off, but when it has been on for a while sounds like the pump or something is going cause its loud as all hell.

maybe you need a new pulley or belt? do you use it alot?
thankfully it doesnt get hot enough in tacoma for me to really care, it almost never gets turned on.

andoxviii

iTrader: (1)

Well I'm not noticing any issues with the power steering or alternator which run off that belt, so for now I am going to assume the belt is fine...but I will inspect it, just in case.

Flywheel is stock.

The pulley noise isn't really high-pitched, but it is clearly audible when the car is idle. You can hear each turn of the pulley loud-and-clear.

Okay, so I guess the next step would be to lube this pulley and see what happens. What kind of grease should I be using?

Is it possible that a bad A/C clutch or bad pulley could cause excessive tension on that belt? If lubing doesn't work, is it possible to change the pulley only, or would replacing the entire compressor be a better option?

Thanks for the input so far guys, this has been going on for a year now and I'm fed up!

rick_rabies

lube it. if no help. change the pully. if still no change the clutch dealy. does the pully have a wobble to it?

andoxviii

iTrader: (1)

Yeah I know I need to lube it, thats why I asked what kind of grease to use in the last post

No wobble in the pulley. Looks perfect, sounds like ****.

300whpej

my car feels like a cow when driving with the a/c on. where are you shifting? i have found when i shift under 4k with my a/c on my rpms fall flat on their face, but anywhere above 4200 ish i notice no difference. i have a b7 btw.

Vindicator9000

If you have a D series, power steering and alternator do NOT run off the same belt. They're all running off separate belts from the crank pulley... you should have 3 different belts running from the crank. You don't normally notice how much drain PS and alternator cause on the engine because they're always running.

I don't think bad clutch or pulley would cause excess tension, but improper adjustment would. The system is designed so that you can adjust for tension... I think there's a tensioner, but I can't remember.

Yes, you can replace the pulley, but it comes as part of a clutch kit, that comes with the clutch, pulley, and everything to overhaul it except the belt. It's about $100 from majestic when I priced it last year.

andoxviii

iTrader: (1)

Oh really? I never took the time to notice...okay, I will definitely inspect the belt after work and report back here.

I know the main belt has a tensioner, but I've never noticed if the A/C belt had a tensioner (probably because I assumed it was running on the same one...) but I will look for one when I check the belt.



Thanks again for all the input guys.

andoxviii

iTrader: (1)

I think my RPMs drop just as quickly from 6000 rpm as they do from 3000 rpm. I will pay more attention though on the way home from work today.

FlewByU352

D16Y8 and when the AC goes on you can feel it the car will actually slow a little and its not as snappy. I hardly ever use AC even in Florida IDK why I just like the fresh air better.

rick_rabies

time for a incabin fan and motor swap...

epicbeats

check your timing

andoxviii

iTrader: (1)

Heh, yeah...I'm currently building a turbo kit based on a TD04-15G. I still need some parts before I can install it though. Hopefully it won't feel so sluggish with the A/C on when that's installed

Anon51

z6 here and i do feel its slower but the rpm's don't drop drastically for me.
i also have a b swap with the y7 compressor and it runs just fine.