I need help with my AC system

Elseco

New Member
Jun 24, 2020
4
0
1
47
New Orleans
Good afternoon, I'm reaching out from the deep South about a problem I'm having with my AC system. I own a 99 Mustang V6 and the car's RPM increased every time I turned on the AC. At that time, there was enough refrigerant in the system so it wasn't a lack of refrigerant. I finally figured out that the AC low pressure valve also know as the AC clutch cycling switch is faulty. After 21 years, I wouldn't doubt it either. It turns out that I tried to change this part myself since it looked easy enough but the refrigerant came out. I guess the valve on the accumulator didn't closed and kept coming out. I tried my best to change the part and replace the o-ring as quickly as possible but enough gas had escaped and now the AC clutch on the compressor is not engaging. I know the system is low on refrigerant and the easy thing to do is just to fill it with AC Pro or any other brand out in the marketplace. My question is since the system was open for the time I was trying to replace the AC low pressure switch and the O-ring, does anyone know if I now need to replace the accumulator? Again, the system still has some refrigerant but it's low to the point that the AC won't work and I know the system does that to protect the compressor. Also is it a good idea to evacuate all of the remaining refrigerant and to put a vacuum on the system to take out all of the moisture?

Any help or suggestion will be appreciated.
 
  • Sponsors(?)


stormsedge

Active Member
Jun 17, 2018
278
82
38
Here
Your description of what took place leaves me with enough questions to recommend you take it to a shop where they can do a vacuum drawdown and fill the system with a set full set of gauges. They can make a determination on any other parts needed (I suspect not if you were quick about the changeout).
 

Elseco

New Member
Jun 24, 2020
4
0
1
47
New Orleans
I have to admit I wasn’t quick about it since I wasn’t expecting gas to leak out. The gas is under enough pressure that what I might perceived as a small amount might be a lot.
So yes, there is not enough refrigerant in the system to make the AC clutch engage. Now, I didn’t change any major piece in the system like say the compressor or the evaporator. I just let some of the refrigerant escape by accident. Would this be enough reason to replace the accumulator? The repair manual says every time the system is open to the outside like in the case if replacing a major element in the system.
 

stormsedge

Active Member
Jun 17, 2018
278
82
38
Here
As you are aware, you usually get a pffffsssst of freon when removing the low pressure switch...the valve is supposed to stop the flow. If you had a steady expulsion of freon for...one, two, three...thirty...sixty seconds (I can only guess), then there may have been some moisture introduced into your system. The accumulator's purpose (as you know) is to eliminate debris and moisture in the system...too much moisture can result in freezing of the expansion valve rendering the system inop, and in extreme cases, damage to the compressor. That about exhausts my limited knowledge of it. The question you are pondering is--did the length of time you experienced freon loss introduce enough moisture into the system? Unknown. I suspect that when you realized it was coming out, you hustled to get the new piece on...so the time lapse (while painful in slo-mo) may not have been that great. Under these circumstances, if I needed to save money, would I try to charge it myself first? Probably. Roll the dice...tip your waiter.

((Btw, and I hope this doesn't jinx me...I have not had any of my vehicles on a regulation AC manifold set, vacuum pump, etc and only added freon once a year for probably the last twenty.))
 

Elseco

New Member
Jun 24, 2020
4
0
1
47
New Orleans
Yes, I think that's the question I need an answer to. I figure it's either I refill the system with something DIY like ACPro or let a professional evacuate the remaining refrigerant and put a vacuum in it to pull all moisture. Well, thanks a bunch Storms Edge for your input. I really appreciate it.
 

Elseco

New Member
Jun 24, 2020
4
0
1
47
New Orleans
So I found out that the AC system was completely empty and the schrader valve in the accumulator was the culprit. I can't believe one little thing like that could've given me so much work. Anyway, I went an replace the schrader valve and the system was again ready to be vacuumed to see if it could hold pressure. So I went to my local OReilly's and rented a vacuum pump and an AC manifold gauge. Put the manifold gauge together and place a vacuum on it. Left it there for over 1 hour and a half. I went a head and closed the high and low ports to see if it could hold the vacuum and it held it. So after that it was just two bottles of EZ Freeze and got a cold air once again.
I have to point out that I got great guidance from two videos on youtube.
One is this how to add refrigerant to your AC: View: https://www.youtube.com/watch?v=zAageqHBj4k

and the other is how to put a vacuum on your AC system: View: https://www.youtube.com/watch?v=kUdCa3feGvg

It belongs to a channel named RnW or Rachet and Wrenches.
I tell you, I saved a whole lot of money and I believe I did a great job by taking all the humidity out of the system.
 
Thread starter Similar threads Forum Replies Date
G Engine Need help with cooling system issue Fox 5.0 Mustang Tech 12
starstruck106 Need Help 1995 Convertible 3.8 Temp Gauge still not working and alarm system is draining my battery 1994 - 1995 Specific Tech 11
M Need Help With Mach460 System 1996 - 2004 SN95 Mustang -General/Talk- 1
H Need Help With Anti-theft System 1996 - 2004 SN95 Mustang -General/Talk- 4
BKM48198 A/c-r-12 Help Needed-system Has Been Opened. Fox 5.0 Mustang Tech 7
L Getting New Nitrous System Need Help With Fuel 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 3
boostfrk Engine Need Some Help Putting Smog System Back On Fox 5.0 Mustang Tech 5
B 1988gt Electrical System Shot. Need Help. Fox 5.0 Mustang Tech 4
N Need Help With A Fuel System Fox 5.0 Mustang Tech 3
Blackone51 Need help identifing something in fuel system 1996 - 2004 SN95 Mustang -General/Talk- 10
G Need exhaust help for my 1998 GT cat back system SN95 4.6L Mustang Tech 0
G Need exhaust help for my 1998 GT cat back system SN95 4.6L Mustang Tech 3
One2One Need help with this new exhaust system ^^ 2005 - 2009 Specific Tech 6
bluovalforever need help with fuel system for carb Fox 5.0 Mustang Tech 3
wicked93gs brake system newbie here...need some help Classic Mustang Specific Tech 9
C Help Needed Now! Failsafe Engine Mode and Check Charging System 2005 - 2009 Specific Tech 6
D Need help installing a Mach 460 system. Mustang Sound & Shine All 8
W fuel system help needed 2005 - 2009 Specific Tech 1
A Need help! Anyone familiar with Mach 1000 system? SN95 4.6L Mustang Tech 8
04YELLOWGT Need Help On System Mustang Sound & Shine All 3
daddystang PCV system problems, still...Need help.. Fox 5.0 Mustang Tech 26
S Need some charging system help Classic Mustang Specific Tech 3
X need help with mach 460 sound system Mustang Sound & Shine All 4
Davin Electrical gurus, I need wiring help on my AirRide system... 1994 - 1995 Specific Tech 4
SaltWaterFish Need help with egr system Fox 5.0 Mustang Tech 2
S want to replace entire mach 460 system need help Mustang Sound & Shine All 6
Katmandu Need Fuel System Help. Going 347 Carb'd in 89 Fox Fox 5.0 Mustang Tech 1
N I need help with my cooling system Fox 5.0 Mustang Tech 5
9 fuel system problem... need help quick Fox 5.0 Mustang Tech 4
RedDaemon need help finding specific security system SN95 4.6L Mustang Tech 0
steed351sc need help choosing exaust system SVT Tech Forum 7
Dusstbuster Quick Brake system help/info needed SN95 4.6L Mustang Tech 0
N cooling system problem need help anybody Fox 5.0 Mustang Tech 8
Y Upgrading the fuel system need help with cpu Fox 5.0 Mustang Tech 2
crazypete Not getting spark after shutting motor. I need some help troubleshooting MSD system Fox 5.0 Mustang Tech 2
V Need Help with A/C System Vacuum Questions SN95 4.6L Mustang Tech 0
pedro Hey sound system nuts, I need your help! Fox 5.0 Mustang Tech 2
H Need Fuel system help! Fox 5.0 Mustang Tech 2
5 IN NEED OF HELP!!! BRAKE SYSTEM! SVT Tech Forum 8
MotleyCrue Hi guys, need help with Catback system SN95 4.6L Mustang Tech 7
7991LXnSHO VW OBD2 help needed. Other Auto Tech 0
8 Engine Need help Fox 5.0 Mustang Tech 5
B Engine 1990 5.0L Fox high rpm cutout and loud backfire - Need Help Fox 5.0 Mustang Tech 9
silverlx50 Engine Bringing Charcoal Canister Back, Need Help Fox 5.0 Mustang Tech 4
A Drivetrain I Need Some Flywheel help/knowledge please Fox 5.0 Mustang Tech 7
B Need Help 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 2
YadiStang 1969 mustang. Need help with door lock actuator rod 1965 - 1973 Classic Mustangs -General/Talk- 0
D Brake issues I need help figuring out what part to order 2005 - 2009 Specific Tech 1
M I need help sourcing/repairing a fender 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 7
D Progress Thread 2003 mustang gt Rebuild 1996 - 2004 SN95 Mustang -General/Talk- 10
Similar threads