ac recharge question on retrofit - The 1947 - Present Chevrolet & GMC Truck Message Board Network

jstrong394 · 10-10-2011, 06:31 PM

Want to recharge my ac tomorrow but don't know if its been retrofitted for the r134. Is there anyway to visually look and tell
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76stepsidechevy · 10-10-2011, 08:01 PM

There should be an adapter screwed onto the fill port.

rwhit57 · 10-10-2011, 10:12 PM

Not everyone will agree with this but I've been doing it for years. You can run 134 in an old system without changing anything. It won't get as cold as the R12 but it works fine. R134 is readily avail at the parts stores, you might shoot a can of oil-charge in it.

**truckdude239** · 10-10-2011, 10:17 PM

most retro i do i pull r-12 vacumm it for 45 mins put the 134 adapters on (r-12 look like the vavle ona tire with treads) and shoot a can ester oil charge in tot the system and charge it never had any issuses

BMERDOC · 10-10-2011, 10:17 PM

Yeah, look for the adapters on the charge ports. No need to change oils or o-rings if it hasn't been retrofitted.

Rogue_Alphonse · 10-10-2011, 10:33 PM

Mainly look for adapters like everyone else said, but really you can put 134a right into an R-12 system without evacuating it.

My system was so empty it didn't even make a sound when I opened the schrader valves, and had to hard-wire the compressor to make it start pushing freon until it started pulling on its own.

No matter what refrigerant, it will run constantly except when you're using the defrost or in some instances, depending on the compressor, when the fan is turned down.

As for how cold it is, it's not the greatest at low speeds, but when you're constantly moving above 30 it'll freeze your foot off.

I recommend putting a can of oil/stop-leak in it too, just in case.

10-10-2011, 06:31 PM	#1
jstrong394 Registered User Join Date: May 2011 Location: south mississippi Posts: 177	ac recharge question on retrofit Want to recharge my ac tomorrow but don't know if its been retrofitted for the r134. Is there anyway to visually look and tell Posted via Mobile Device

10-10-2011, 08:01 PM	#2
76stepsidechevy Registered User Join Date: Nov 2010 Location: Windsor Locks Posts: 628	Re: ac recharge question on retrofit There should be an adapter screwed onto the fill port.

10-10-2011, 10:12 PM	#3
rwhit57 Registered User Join Date: Jan 2011 Location: Tulsa,Okla Posts: 590	Re: ac recharge question on retrofit Not everyone will agree with this but I've been doing it for years. You can run 134 in an old system without changing anything. It won't get as cold as the R12 but it works fine. R134 is readily avail at the parts stores, you might shoot a can of oil-charge in it.

10-10-2011, 10:17 PM	#4
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,237	Re: ac recharge question on retrofit most retro i do i pull r-12 vacumm it for 45 mins put the 134 adapters on (r-12 look like the vavle ona tire with treads) and shoot a can ester oil charge in tot the system and charge it never had any issuses __________________ David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube

10-10-2011, 10:17 PM	#5
BMERDOC Registered User Join Date: Jun 2011 Location: Richmond,Va Posts: 2,934	Re: ac recharge question on retrofit Yeah, look for the adapters on the charge ports. No need to change oils or o-rings if it hasn't been retrofitted. __________________ Nick Carter 1967 C10 Short bed Fleetside Project Cheap Thrills! 2WD C10 Modern/Performance Alignments Easiest Alignment Ever!

10-10-2011, 10:33 PM	#6
Rogue_Alphonse Registered User Join Date: Dec 2009 Location: Gap PA Posts: 280	Re: ac recharge question on retrofit Mainly look for adapters like everyone else said, but really you can put 134a right into an R-12 system without evacuating it. My system was so empty it didn't even make a sound when I opened the schrader valves, and had to hard-wire the compressor to make it start pushing freon until it started pulling on its own. No matter what refrigerant, it will run constantly except when you're using the defrost or in some instances, depending on the compressor, when the fan is turned down. As for how cold it is, it's not the greatest at low speeds, but when you're constantly moving above 30 it'll freeze your foot off. I recommend putting a can of oil/stop-leak in it too, just in case. __________________ 1991 Mustang GT Vert, T-5 w/ Pro 5.0, Trick Flow upper & lower, BBK cold air intake, 3:73, BAMA chip, etc. 1988 K5 Blazer, [coming soon] TBI 400, SM465/NP208, 12 bolt rear, 3:08's, looks like a 1980. 1998 Jeep Grand Cherokee 4.0 fully loaded daily driver! Where there's a will, there's a rig!



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