01 Jimenez Bros Air Ride _ Rod Shop is in charge of the heritage series ac system
Job Jimenez, Jimenez Bros. Air Ride & Rod Shop in Riverside, CA, has completed the Heritage Series installation on this 1952 Chevy Bel Air and it’s time to charge with refrigerant (R134a).

Heritage Series AC (and Heat) Makes it Just Right

By Brian Brennan – Photography by Rob Fortier – Videography Courtesy of Vintage Air

For the longest time air conditioning was a dream that many an early hot rodder didn’t have—in fact, couldn’t have—on their early iron. As times changed air conditioning worked its way onto all forms of transportation to the point it’s almost impossible to purchase any car or truck today that doesn’t have a sophisticated cooling and heating system. Even so, hot rods and AC were still distant cousins. However, over time Vintage Air, serving the rodding community since the mid-’70s, made it “kool to be cool.”

02 The vintage air offers several options for bezel trims
The Vintage Air (VA) Heritage Series AC and heat system come in one of four bezel trims: Pearl (PN 674011) and the one shown and used in this installation, Engine Turned (PN 674012), Brushed (PN 674013), and Black Turned (PN 674014).

In fact, Vintage Air founder Jack Chisenhall proved a point back in 1995 by taking his 1953 Studebaker (initially begun at the hands of the late Jim Ewing of Super Bell Axle Company) and stuffed a 705-inch Chevy into it and cranked out a max run of 241 mph. Oh, did we mention that the Stude maintained a constant 40-degree cool air from the Vintage Air AC unit while at speed! Vintage Air has gone on to additional eye-opening accomplishments. For instance, back in 2003 Ford Motor Company reintroduced the Ford GT and selected Vintage Air to be the AC unit supplier and they continue to be on the current generation GT. It was 18-plus years ago that Vintage Air developed an AC system for electric vehicles. (Yes, electric hot rods are in our future. —B.B.) Once again, on the leading edge of our industry by supplying what’s needed.

03 These are the heritage series unit metrics
Overall measurements of the Heritage Series unit are 16-1/4 inches wide by 5-1/4 inches in height.

That brings us to an offering from Vintage Air: the Heritage Series (AC and heating) system, which took home the 2015 SEMA Best New Product Award and three 2015 Global Media Awards. We asked current Vintage Air President Rick Love for some input on why Vintage Air came out with the Heritage Series.

04 The unit has a depth of about 12 inches for vintage unit
The unit has a depth of 12 inches.

Rick told us: “We wanted a system that was a throwback to the ’60s and we already had the MK IV, which was built from the original ’60s tooling, so the introduction of the Heritage Series was a natural. This time we used the round vents, and it also gave us the opportunity to make it heat as well as a cool system. Also, with the Heritage we were able to use some different bezel trim; Pearl (PN 674011), Engine Turned (PN 674012), Brushed (PN 674013), and Black Turned (PN 674014).”

05 Heritage series is complete with underdash case, make sure to get heater hose kit too!
The Heritage Series comes complete with underdash case, faceplate, hardware kit, and drain kit. Remember, if you purchase the heat/cool version make sure to order the optional heater hose kit (PN 31800-VUD).

Read More: Big Block Bruiser: Firecracker Red 1969 Camaro

For the story at hand, we feature the Mother of Pearl bezel, which gives those with early ’60s customs a chance to have an AC and heating system that fits right in with what they are trying to accomplish. And that brings us to the current installation. We stopped by the Jimenez Bros. Air Ride & Rod Shop and spoke with Job Jimenez and he showed us an installation on a 1952 Chevy Bel Air with a 292-inch straight-six that was going on at the time. He and Rio, one of the shop’s craftsmen, showed us how the installation went.

06 We start by laying out the hose to make sure everything fits
First step is to lay out where the hoses have to run from and to. Once you are confident where the hoses will run you can move onto the engine bracketry that will mount the compressor.

A Little on the Jimenez Bros.

Job Jimenez co-founded Jimenez Bros. Air Ride & Rod Shop back in 1999, located in Riverside, California, and has built a wide array of hot rods, from Tri-Five Chevy to classic trucks and all in between. There are now two locations, with space totaling over 20,000 square feet and they handle many of the facets of building, such as design, fabrication, painting, and overall project management. The shop is well known in the area, especially for their metal fabrication and painting expertise, and as their name would imply air suspension systems.

07 The installation is being performed by Chevy 292-inch inline 6 engine
The base compressor bracket bolts to the cylinder. Our installation takes place on a Chevy 292-inch inline 6 engine so we had to pay particular attention to the second plug wire back from the front, noting proper clearance.

Heritage Series

The Heritage Series is an underdash, compact unit (16-1/4 inches wide by 5-1/4 inches tall by 12 inches deep) and comes with mounting brackets, a drain kit, detailed instructions, and it’s intended to be used with R134a refrigerant. A nifty touch is the new 508 Sanden compressor that’s supplied with a complete kit and comes with the required system refrigerant oil—no additional oil should be added or deleted!

08 Secondary compressor bracket bolts on to the cylinder head
Secondary compressor bracket bolts to both the cylinder head and the base bracket.

The system comes with a binary pressure safety switch, which is ideal for systems that utilize a mechanical block-mounted cooling fan. Should you find yourself using an electric fan than you will want a trinary switch to add a fan engagement signal with AC pressure. Let Vintage Air know your requirements at the time of order and they will make sure you have the proper compressor safety switch.

09 how the base bracket and the secondary bracket look
This side view allows us to see the base bracket and the secondary bracket once positioned.

Before taking everything out of the box and jumping directly into the installation, keep this in mind. It’s critical that the compressor, evaporator, AC hoses and fittings, hardlines, condenser, and receiver/drier remain capped. Should you remove the caps too soon you run the risk of moisture seeping into the components, hence contaminating your system. (Go ahead, ask me how I know this! —B.B.) Pay particular attention to the receiver/drier as this is especially critical.

10 AC compressor bracket needs the distributor cap to be removed for an easier installation
Here the third of the three main AC compressor brackets is installed. You will notice for this installation we have removed the distributor cap to make attaching the bracketry that much easier.

Watch More: 1967 Chevelle Vintage Air Install

When you look at the faceplate of your Heritage Series AC and heater you will see three knobs. There’s a Blower Speed Knob (“F” knob) and it does just what it implies, controls the blower speed that pushes the air out at a prescribed speed (volume). Next up is the Heat Knob (“H” knob) located in the middle of the faceplate. Yep, it controls the temperature. Lastly, to the far right, there’s a Thermostat Knob (“C” knob). It controls a mechanical AC thermostat.

11 Compressor Sanden R134a is test fitted
The Compressor Sanden R134a is test-fit.

Fundamentally, an automotive thermostat controls the temperature of the evaporator coil rather than the temperature of the air. Its main purpose is to prevent ice from forming between the fins of the coil. Should icing occur the AC performance will be degraded. By adjusting the “C” knob with its arrow pointing straight up, the thermostat will turn the compressor off at approximately 34 degrees F. As a result, no ice will be allowed to form on the coil. Sometimes, in areas of very low humidity, such as Phoenix, it’s possible to adjust the thermostat colder and ice will not form.

12 Another angle of Sanden AC compressor to make sure the belts line up
Here’s an opposite view of our Sanden AC Compressor in position and bolted into place. At this point make sure all belts line up.

As for day-to-day operation of the Heritage system, Vintage Air recommends always running the evaporator as cold as possible by positioning the “C” knob (right) with the arrow pointing straight up. You can then achieve the desired temperature by blending in heat using the “H” knob (center). Should you find yourself at the Louisville Nationals or other hot and humid events and want max cool then position all (three) knobs with the arrows pointing straight up.

13-Vintage-air-condenser-bracket-for-a-1952-Chevy-Bel-Air
You are looking at the condenser brackets in front of the radiator.

Should You Want Heat 

The Heritage Series is cable of providing heat but not everyone wants this so make sure you let VA know your wishes that you desire both cold and heat. If this is the case, then you will want to purchase the optional Heater Hose Kit (PN 31800-VUD), or you can purchase a 5/8-inch rubber heater hose from your local parts store. While you are at it make sure to freshen the water/coolant mix in your radiator. Vintage Air recommends at least a 50/50 mixture of approved antifreeze and the use of distilled water. No need to contaminate a brand-new heater with corroded coolant.

14 Jimenez Bros slides the condenser in place to test-fit on the brackets
Here Rio of Jimenez Bros is sliding the condenser in place to test-fit it to its brackets. Note the condenser is protected with cardboard taped to the fins and plugs remain in position over the ends of the fittings to prevent internal contamination.

Pretty much doesn’t matter where we live, all of us experience some form of “winter.” Keep this in mind: It’s helpful to run the AC compressor to dehumidify the interior and reduce the potential for window fogging. To achieve this, run the “C” (thermostat knob) with its arrow pointing straight up, or back it off slightly as desired. Should you find yourself out on a particularly cold morning, you can achieve “max heat” by positioning the “C” knob to its full counterclockwise position (compressor off) and the “H” knob to its full clockwise position (heater control valve fully open). (Modern Rodding contributing editor Chuck Vranas often finds himself a bit chilled on those Boston winter mornings. —B.B.)

15 Heater control valve of our new AC system on this 1952 Chevy Bel-Air
You are looking at the heater control valve plug that contains five wires that run to the control module (background). Eventually, it will plug into the Heater Control Valve.

Plan Your Work Then Work Your Plan

Where to begin? It’s always best to initially plan the route of the AC and heater hoses. Once you know this then you can begin by installing the major pieces, such as the AC compressor, condenser, and drier. In this initial effort, the evaporator is mounted under the dash but mounted temporarily. (Again, go ahead and ask me how I learned that little trick! —B.B.)

For proper condensate drainage, it’s important to mount the evaporator level on its four axes—front to back and left to right. The Vintage Air Heritage Series unit was designed for street rods, custom cars, and trucks, and as such the evaporator is intended to be mounted under the dash.

17 Heater control valve for the Vintage Air AC system
You’re looking at the Heater Control Valve—pay particular attention to the direction of the arrow as that signifies the flow of fluid through it. Note the heater control valve plug is plugged into position.

The best way to confirm this, rather than just “eyeball” it, is to grab your handy bubble level from your toolbox and place it on the bottom of the case. (You know the level you should have used to make sure your engine/trans, chassis, and body are all in proper perspective. Check with the detailed Vintage Air instructions on page 7 to confirm.) The left-to-right perspective should be as level as possible, no cheating here. The front to back may have up to 2 degrees tilt toward the drain outlets (louvers up).

18 Hose routing diagram for our Vintage Air heritage series AC system
Hose Routing Diagram.

Read More: How To Install EZ Clip AC Fittings To Keep Your Hot Rod Cool

This is all checked during the test-fit stage. The final mount of the evaporator will not occur until you have verified that all hoses attaching to the evaporator will exit the firewall and/or kick panel as planned. Remember, “Plan your work and then work your plan,” and a bit of added philosophy, “Measure twice, cut once.”

19 We run from the drier and the condenser back into the engine compartment to the firewall on the 1952 Bel Air
Remember we said earlier know where you hoses/lines will run from and to? At the bottom of the core support on our 1952 Chevy Bel Air, there’s an opening (a wire mesh was removed) and it’s here our hoses will run from the drier and the condenser back into the engine compartment to the firewall and then into the inside.

There are left and right and upper mounting brackets provided and these are somewhat “flexible” in their use. The left and right mounting brackets can be switched side-to-side and the rear upper mounting bracket can be trimmed or bent as needed. The hardware provided is ¼-20×1/2-inch hex bolts with 0.625-inch od by 0.281-inch id flat washers.

20 The drier of our Vintage Air AC system is located and mounted here
Here the drier is mounted to the core support via two straps. Note caps are still on fittings of the drier and condenser (good job!) as this prevents the potential internal contamination of these parts. Drier is located in a cool place, it’s mounted vertically, eyesight is at the top and easily visible—all “dos” when mounting the drier.

When planning for the drain hose keep the following in mind. First, when determining the drain location, consider the following: Drain hose must be installed with a minimum 1-inch drop from the evaporator case to the point where the hose exits and does so directly onto the ground. The drain hose and tee can be assembled in any configuration that meets these requirements, remembering that there’s a drain outlet on either side of the evaporator that needs to be accounted for.

21 Measuring the high pressure AC hose is supplied in the kit
Time has come to measure the high-pressure AC hose that’s supplied as part of the kit. Also, note that the fittings are positioned onto the drier but the high-pressure ends have as yet to be affixed.

Something Vintage Air’s Love told us he sees all too frequently is an improperly mounted drier. There are several “dos” and “don’ts” when it comes to the drier. You “do” want to mount it where you have room, you “do” want it in the coolest spot you can find (inside the passenger compartment is fine and mounted to the core support in front of the radiator off to one side will also work). But the biggest “don’t” is to improperly mount the drier, which means mounting it in such a way that it isn’t within 20 degrees or so of vertical. Do not mount the drier upside down, and note that the drier is directional. The #6 line from the bottom of the condenser connects to the male threaded inlet labeled “in” and the hose leading to the evaporator will connect to the adjacent outlet.

22 Vintage Air has the high pressure line crimps to prep your lines for your AC system
Vintage Air will loan you the tool to make your own high-pressure line crimps. Shops such as the Jimenez Bros. often purchase these tools and have them readily available. Note the light green rubber O-ring—Vintage Air supplies oil to be used with the #6, #8, and #10 O-rings supplied. There are also specific torque specifications for each; follow the Vintage Air recommendations.

There’s a litany of things to do when cutting, affixing the fittings, and lubricating the O-rings. Best to refer to page 8 of the instruction manual for this—and follow the instructions. 23 Jimenez Bros already have the crimping tool in their hot rod shop

A word on the system’s condenser. Vintage Air always wishes to supply the largest condenser that will fit a certain application. As for fitment, its most desirable position is in front of the radiator. Love tells us that 1/8 of an inch is a good target for the gap between the condenser and radiator cores. The radiator and condenser are both heat exchangers and you want proper air to flow through both so that they function optimally.

24 Vintage air supplies the oil to be used with the supplied O-rings
Vintage Air will loan you the tool to make your own high-pressure line crimps. Shops such as the Jimenez Bros. often purchase these tools and have them readily available. Note the light green rubber O-ring—Vintage Air supplies oil to be used with the #6, #8, and #10 O-rings supplied. There are also specific torque specifications for each; follow the Vintage Air recommendations.

Again, according to Love: “The condenser is your heat exchanger that dissipates the heat absorbed inside the car. Just like the evaporator, we want to use the largest heat exchanger possible, using the radiator core dimensions as the guide.”

25 AC compressor lines are color coded for ease of installation
Note the red and blue caps on our high-pressure AC compressor lines: A color code is used to distinguish between high and low pressure. The low-side hoses are blue while the high side is red. The blue hose reading ranges from 0 to 99.9 psi while the red hose goes up to 999 psi.

Matching an AC compressor to the job is also another important aspect. Vintage Air uses the 508 Sanden compressor for many of its applications, including the installation shown here. Love gave us some additional insight into this AC compressor.

26 The high pressure lines have fittings crimped and attached to the drier and condenser
The high-pressure lines have their fittings crimped on and the fittings are attached to their respective positions on both the drier and condenser. Remember, the #8 fitting (the big one) is on top and the #6 fitting (the small one) is on the bottom.

Read More: 1971 Chevy C10 Vintage Air SureFit Install

He told us: “The capacity of a 508 is a good choice in most aftermarket cases for a compressor because with any AC system you want to match your components. You don’t want a compressor with too much capacity, going with a condenser that’s too small because you’re just pushing more refrigerant through that condenser, and then you’re going to end up with head pressure issues. When I’m doing seminars, I always talk about matching components and I’ll say, ‘It’s no different than a brake system.’ When you want to use the latest 4 or 6-piston calipers with your 14-inch rotors, you’ve got to make sure that your master cylinder bore size and pedal ratio are matched to deliver the amount of brake fluid that you need. If you’ve got a mismatch master cylinder you’re not going to have adequate performance out of those brakes. Same for the AC system.”

27 The Vintage Air AC system uses a trinary switch with Hi_Lo pressure protection
In this application it’s a binary switch, which is best used with a mechanical block-driven cooling fan. Remember, a trinary switch combines Hi/Lo pressure protection with a pressure-driven fan-engagement signal when the electric fan(s) are used. One blue wire runs to the AC compressor and one blue wire runs back to underdash unit.

Another question that pops up frequently is, “Which size line is at the top and which is at the bottom on the condenser?” Love told us to always make sure that the #8 (the big one) is on top and the #6 (the small one) is on the bottom. You have high-pressure gas going into the top of the condenser and high-pressure liquid coming out at the bottom. We are reminded by Love that liquid is heavier than gas so you want the liquid on the bottom and the gas on top.

28 The original inlet for air the heater needs to be removed for the new heater system
Back on the firewall, here is the original inlet for air to the heater. It will be removed.

A little on the electrics of the AC system. Vintage Air includes in their wiring harness a 30-amp circuit breaker. They also recommend going directly to the battery (or starter) for power. This is done so that you are confident that you are carrying all of the current load in a new GSL wire. It’s never a good idea to try and hook directly to a fusebox on an early car and then pull the heavy amperage load. The optimal situation would be to have a new wiring system, such as an American Autowire kit, that plans for AC and all of the proper connections are provided.

29 Bulkhead fittings are used for the heater and AC hose of the new AC system
The original firewall air inlet was removed and now a bulkhead fitting is positioned that allows the heater and AC hose to pass through into the interior.

Time to be Kool by Being Cool

Once you have your Heritage system installed there are a series of final steps to be taken that are recommended by Vintage Air. Refer to their instruction manual (page 9) for all of the particulars you should go through to ensure that you have installed your system correctly. It’s also a good idea to have your system serviced by a licensed AC technician. Proper evacuation and charging of the system are critical to optimal performance!

30 The lines of the AC system are feed through the firewall
The underdash unit has four outlets; the top and bottom are for the high-pressure lines (low-pressure gas is pulled by the AC compressor from the top and high-pressure liquid feeds in at the bottom) for the AC while the center two are for the low-pressure heater hoses to attach.

Well, there you have it; it’s time to be oh-so-cool on the oh-so-hot days! MR

Sources
Jimenez Bros. Air Ride & Rod Shop
(951) 343-5948
jimenezbrosairrideandrodshop.com

Source:
Vintage Air
(800) 727-7094
vintageair.com

Subscribe to our Magazines