AC Port low side

Help Support 7173Mustangs.com:

mpbsr

VIP Members
Joined
Mar 7, 2013
Messages
1,280
Reaction score
25
Location
New Jersey
My Car
1973 Mustang Convertible (Mach I Tribute)
I had my AC converted a while away to R134A, but when the shop rebuilt the engine I don't think they recharged the system.

Can someone post a pic of the low AC port as I would just rather recharge it myself as getting the car back to the shop is a pain.

Thanks

 

OMS

Vendors
Joined
Jul 22, 2010
Messages
4,563
Reaction score
160
Location
ohio
My Car
xxx
If the system was opened or leaked out, you shouldn't just recharge it.

It should be evacuated with a vacuum pump to remove any moisture from the system first. Plus once a vacuum is pulled it can be left to set there for a little while, this will show there are no leaks if the vacuum holds.

 
Joined
Feb 1, 2013
Messages
3,746
Reaction score
31
Location
Richland, WA
My Car
1973 Mustang Mach 1 Q code C6 tranny
If the system was opened or leaked out, you shouldn't just recharge it.

It should be evacuated with a vacuum pump to remove any moisture from the system first. Plus once a vacuum is pulled it can be left to set there for a little while, this will show there are no leaks if the vacuum holds.
+1

When I had mine done after converting it they pulled a vacuum and held it for 30 minutes to ensure it was not leaking. Pressures very for each type of refrigerant, here's the one for R134A.

1214697d1372440308-honda-idsi-gas-charging-servicing-diy-few-questions-r134atemp-pressure-chart.jpg

 
P

Pastel Blue

Guest
Curious... with the conversion to 134A, what was involved and how does it operate in comparison to the factory R-12 system? My understanding is that you retain the factory system components more or less, which would be my goal on my current restoration. Thanks

 

mpbsr

VIP Members
Joined
Mar 7, 2013
Messages
1,280
Reaction score
25
Location
New Jersey
My Car
1973 Mustang Convertible (Mach I Tribute)
Curious... with the conversion to 134A, what was involved and how does it operate in comparison to the factory R-12 system? My understanding is that you retain the factory system components more or less, which would be my goal on my current restoration. Thanks
As far as I know, all factory components are the same.

Here's a pic of the system. I'm guessing the black cap is the low side port?

Can anyone confirm?

IMAG0296.jpg

 
Last edited by a moderator:

OMS

Vendors
Joined
Jul 22, 2010
Messages
4,563
Reaction score
160
Location
ohio
My Car
xxx
That line looks like it is going forward to the condenser ?

The low side [ suction ] would be the large line coming from the firewall to the compressor

The large line going to the condenser is the HI pressure side

CAUTION

If your not sure what your doing you can rupture lines.

I've seen some hellacious pressures - they could do some damage.

Even the low pressure liquid can cause freeze injuries.

Not trying to discourage you or be a D here but would you be comfortable recharging you home A/C system?

 
Last edited by a moderator:
Joined
Feb 1, 2013
Messages
3,746
Reaction score
31
Location
Richland, WA
My Car
1973 Mustang Mach 1 Q code C6 tranny
That line looks like it is going forward to the condenser ?

The low side [ suction ] would be the large line coming from the firewall to the compressor

The large line going to the condenser is the HI pressure side

CAUTION

If your not sure what your doing you can rupture lines.

I've seen some hellacious pressures - they could do some damage.

Even the low pressure liquid can cause freeze injuries.

Not trying to discourage you or be a D here but would you be comfortable recharging you home A/C system?
+1

You don't want to put more than the recommended amount of refrigerant into the system. I have seen the gasket on the compressor rupture because it was overfilled.

I have converted a r12 system with R134A without changing the components with no issues. I personally think R12 cools much better but the conversion was good too.

If I remember correctly the fill ports need to be changed, it was a long time ago and I don't really remember. Much easier to take the vehicle to a service center to get this conversion done.

 

Don C

Fords Forever
Joined
Jan 1, 2012
Messages
8,105
Reaction score
853
Location
Springfield, OR
My Car
1971 Mustang Sportroof M code
John is correct, with all components the same R12 will cool better. I believe R134 systems have larger condensers to achieve the same cooling. I've done the conversion a couple of times and have been satisfied with the results using original components.

Are you sure yours was converted? My conversions a came with R134 snap-on coupler converters.

 
Last edited by a moderator:

mpbsr

VIP Members
Joined
Mar 7, 2013
Messages
1,280
Reaction score
25
Location
New Jersey
My Car
1973 Mustang Convertible (Mach I Tribute)
John is correct, with all components the same R12 will cool better. I believe R134 systems have larger condensers to achieve the same cooling. I've done the conversion a couple of times and have been satisfied with the results using original components.

Are you sure yours was converted? My conversions a came with R134 snap-on coupler converters.

Yes, mine was def converted about 2 years ago. So going back to R12 isn't an option.

Looking at the Acprocold web site the black cap which attaches to a port is the low port as the hose also connects to the evaporator, of which it does.

http://acprocold.com/ac-pro-instructions/

 

timsweet

VIP Members
Joined
Aug 21, 2015
Messages
489
Reaction score
2
Location
Tucson
My Car
1973 Mustang Sportsroof. Currently a work in progress!!!
Check out Red Tek 12a...suppose to work with for R12 systems and R134. Anyone Try that yet?

 

73pony

VIP Members
Joined
Jul 6, 2015
Messages
4,241
Reaction score
92
Location
Iowa
My Car
1973 Mustang Grande 351C 2v
I think it is listed as flammable.

 
Top