I haven't used the A/C in like 4 years. There was leak in the sytem and didn't want to pay to have it fixed. Well, my buddy at NAPA hooked me up with a R134a convertion kit for like $19. Put it in, found the leak and fixed that. But now a good majority of the time when the A/C is on, the brakes get hard. I almost rear-ended someone the other day.(note that this is when I throw it in neutral while stoping for a light or something. If I left-foot brake while holding the revs at 2.5K the wheels lock). Now, when the A/C is off, I've noticed that while in neutral, and braking, the motor will keep the revs at 1K, or so, untill at a COMPLEAT stop ...then it drops to the set 700-800 rpms. I imagine this to provide good vacum for the booster. When the A/C is on, this function seems to be retarted somehow and, I'm asuming, not giving the booster the nessecary vacum. Is this a correct analysis. What would cause this and how can it be remedied?
BTW: cold A/C in phoenix in the summer after 4 years of not having any, rocks.

 

Hmm, what you are suggesting does sound plausable, but the best way to determine what may be happening is to use a vacuum gauge, they can tell you alot about what is happening with your engine. This will tell you if engine vacuum is low, or not, and give you a direction on which way to go from there to remedy the problem.

Do some testing with the A/C off and record that, on a peice of paper, along with any other info that you see as important to record, then turn the A/C on and do the same testing, if engine vacuum changes then you can look at things like vaccum lines, gaskets, but I'm not sure how just the A/C would change that.

 

19 bux! Geesh, I should get mine working about. I heard it was really expensive to convert the system and have been pondering deleting it.

-Dan

 

Yah, it was great! The kit came with quick conect adapters for the low and high side, the can hose (with the quick connector), this special oil that will ocnvert the old oil to usable oil and 3 cans of R134-a. I think the normal price was $30 or so.

 

This sounds about bass ackwards of carbed engines. When the A/C is switched on, there is an idle solinoid that pushes on the throttle lever to kick up the revs so it wont stal out. Also, you have more vacuum at the lower rpms, than at higher.

W/the A/C on, stopping in nuetral, what do the engine revs do? Is the engine wanting to stall out or anything?

 

Did I mention that it is not carbed but MPFI ('86 2.8)? Idle solinoid? Are you talking about the IAC? With the A/C on, in neutral and stoping, the revs are lower than with the A/C off....like 700-800 and frequently its 500-600 and thats when the brakes get hard.

 

You know, I actually have a brake problem right now too, and I never noticed it before until I started using the AC alot (2 weeks ago) I'll have to check and see if my brakes work any better today when I have the AC off. I'll let you know...

 

It would suck if you are having the same problem as I ,but at the same time, it would be nice to know that I am not the only one with this problem

 

Luke, did some testing with the car this weekend and I guess my problem doesn't have anything to do with the A.C. Sorry man, guess it's all you

 

poop

 

You could turn the AC off before you stop???

My moms old escort was dangerous to pull out into traffic with the ac on. a quart of snake oil duralube and you could dump the clutch and go like normal.

Matt


I have heard that them change over kits will ruin the system if you do not get all the old stuff out. If it mixes it will cause a freeze lock that will never go away.

But I also hear with a borrowed vac pump, its easy as heck to keep your system nice and fresh.