Convert your old R-12 manifold gauges to work with R-134a, the new refrigerant!
Complete Auto A/C Manifold Pressure Gauges available at the COOL ZONE!

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Your best source for complete troubleshooting and diagnosis information on auto A/C systems. Our information provides proper repair, recharge, service and maintenance procedures for all automotive air conditioning systems. Regardless if you have a current CCOT (cycling clutch orifice tube) system or an expansion valve and POA valve system, we've got the information you need. From step-by-step help on retrofitting and recharging to complete A/C compressor or component replacement, our A/C manuals provide you a quick and easy methods that have been proven helpful to everybody from the apprentice to the professional.

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A/C Gauge sets, charge hoses and quick couplers?
Manifold pressure gauges for every budget from the COOL ZONE on-line auto A/C warehouse direct! Manifold pressure gauges for every budget from the COOL ZONE on-line auto A/C warehouse direct! Manifold pressure gauges for every budget from the COOL ZONE on-line auto A/C warehouse direct! Manifold hoses? We've got a complete selection for all your manifold gauge set hose requirements from the COOL ZONE on-line auto A/C warehouse direct! R-134a couplers available from the COOL ZONE on-line auto A/C warehouse direct!

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Confused about the difference between R-12 and R-134a manifolds and hose connections for recharging your auto A/C system? The information below will eliminate the confusion and show you exactly what you need to convert your old R-12 gauges to work with any R-134a A/C system.

Do you have old R-12 manifold gauges?
Would you like to convert them to use with
any R-134a A/C system?

The COOL ZONE has all the adapters that you need!

... and here's how they work with your R-12 gauges

Pictured on the right is a comparison between a typical R-134a hose (left side of the photo) and an R-12 charge hose. Note that the R-134a hose uses a 1/2" ACME thread (male) to connect to the quick coupler.

The R-12 hose is manufactured to connect to a conventional MALE FLARE Charge Port typically used on R-12 A/C systems. The ADAPTER connects to the R-12 charge hose and the R-134a Quick Connect coupler. Using that adapter, you can convert your R-12 hoses to work with any R-134a A/C system

Keep in mind that you will require one adapter for each hose!

See the adapters now!

There's different couplers and adapters... but they all do the same job when you're converting your R-12 gauges!
When converting your R-12 gauges to work with R-134a, you have to verify what couplers you have (or which ones you will purchase).

The R-134a quick coupler on the left in the photo will require an adapter (as shown). The quick coupler on the (lower) right is manufactured to convert your R-12 hose, so no adapter is required.

The coupler kits at the COOL ZONE are already packaged with the correct adapters. That way, you get the couplers and adapters you need without having to search for the right ones.

Don't forget about your vacuum pump and refrigerant supply! Those connections will need adapters too!
Yes, when converting the charge hoses on your manifold gauge set it's important not to forget about the vacuum pump and refrigerant supply (or your freon tank).

The photo here shows a typical R-12 YELLOW hose and teh adapter. The adapter will connect to R-134a ACME thread on R-134a refrigerant tanks. Depending on the vacuum pump you're using, you may also require this adapter to connect to that too!

Why purchase a complete kit ?
As an example, here's a look at a complete coupler kit that is used to convert your R-12 gauges to work with any R-134a A/C system.

You will notice that this kit include the Quick couplers (to connect to your R-134a A/C system) plus the adapters that will thread into the coupler and attach to your old R-12 hoses. Also included in the kit is the adapter for your center (yellow) hose. That adapter let's you connect to the R-134a refrigerant (freon tank). Everything you need is included in this kit (item no. AR-6248) or the more economical kit AR-6236.


When you're converting your R-12 gauge set and hoses, keep in mind that (for the most part) R-134a couplers and connections will NOT require the valve core depressors.

As shown in the photo on the right, you can easily remove the core depressor. That will provide you better flow of refrigerant (freon) through your gauges. Just don't forget to keep the seal (green in the photo) because you will require it to make a leak free connection.


When you're removing the valve core depressors, keep in mind that there are a variety of different ones. This photo shows the most common depressors. They can all be removed from the hose while leaving the seal in place.

A/C Gauge sets , hoses and quick couplers are all available
at the COOL ZONE!

A/C Manifold gauge sets, hoses and quick couplers are available at the COOL ZONE! Need to convert your R-12 gauges? We have everything you need to do that too!

A/C Manifold gauge sets, hoses and quick couplers are available at the COOL ZONE! Need to convert your R-12 gauges? We have everything you need to do that too!

A/C Manifold gauge sets, hoses and quick couplers are available at the COOL ZONE! Need to convert your R-12 gauges? We have everything you need to do that too!

A/C Manifold gauge sets, hoses and quick couplers are available at the COOL ZONE! Need to convert your R-12 gauges? We have everything you need to do that too!

Professional Brass manifold Gauge Set - AR6245
All brass manifold includes sight glass; metal hand wheels; hook to hang up gauges. Hoses not included.
$99.95 each Kit - DETAILS

See more selections!

Complete manifold gauge set; included 72" hoses, couplers and carrying case;
R-12 or R-134a - AR6246

Excellent value for the Professional on the go or the DIY'er! Complete set includes GAUGES, HOSE SET and R-134a COUPLERS plus rigid storage case!
$139.95 each Kit - DETAILS
R-134a Hose Sets - Choose from 3 popular lengths!
Professional quality hose sets for R-134a gauge sets. Available in 3 lengths; see details. Fits all R-134a hose sets.
From $29.95/Set - DETAILS
R-134a Couplers - AR6247
90° chrome coupler set; manual 'open' and 'close'. Fits all R-134a hose sets.
$57.99 each Set - DETAILS

See more selections!


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Auto air conditioning service products, repair and troubleshooting manuals are available at the COOL ZONE! Secure on-line transactions powered by WorldPay!

Keepin' Cool - Your best automotive air conditioning e-zine with updated information on auto A/C parts and general service information. All available from autoACsystems and the COOL ZONE! Your on-line A/C Connection! Polymax Refrigerant Oil - Replaces PAG, Ester and Mineral oil - Approved for use in all Auto A/C systems and with all refrigerants too! R-134a! R-12! Hydrocarbons and blends! HC's! R-12a and more! Braze Perfect! Simply the world's easiest aluminum brazing solution! Repair A/C hoses and lines with a standard propane torch!

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