From this angle, you can see the factory-like flexible line that runs along the apron and shock tower. We secured ours with an insulated clamp. | 
Defensive Lineman
The Old Air Products Hurricane system isn't a straight bolt-on system. It will challenge your fabrication skills in a number of areas. Refrigeration hoses and fittings arrive on your doorstep ready for fabrication, easily handled by any reputable auto A/C shop. Carefully measure your application, then have your shop swage fittings onto the ends. If the kit doesn't have what you're looking for, count on the shop to have it. Old Air includes straight and 90-degree fittings in your kit, along with O-rings and lubricant for proper installation. Be sure to always lubricate O-rings with the grease provided. Don't use white grease or wheel-bearing grease. | 
First, we do a mock-up test fit to check for clearance issues and establish the drain location. Everything lined up for us. |
With evaporator-drain positioning established, a 1-inch hole is bored in the floorpan as shown. You can use the drain provided or a molded vacuum hose for a factory look. The main thing is to keep debris out of the drain. | 
Before permanently installing the air handler, give the vent plug 360 degrees of silicone sealer around the lip, and seat it firmly as shown. When the silicone cures, it's a tight seal. You can also use 3M's Rope Caulk as a sealer. | 
With the air handler permanently installed, we're ready for the firewall grommet. This guy requires patience and a razor-thin cut on the refrigeration side to clear these fittings. Did you notice the use of Ford Tinnerman nuts on these studs to give the Hurricane a factory look? |
We installed the expansion valve, again remembering to lubricate the O-rings and tighten the fittings to proper specifications. Remember, refrigeration leakage can be expensive, so pay close attention to detail and don't cut the seal. What's more, don't force anything. | 
Cool In Black
When building a big Ford or perhaps a grocery-getter wagon, in-dash air conditioning and heating can't always keep up. For less than $100, Old Air's Rear Air Flow Enhancer can help. It keeps cool or warm cabin air moving. Whether it's blazing hot or freezing cold outside, you'll appreciate Old Air's imagination on this one. | 
Old Air Products' Hurricane system manages your car's airflow in many ways. It comes with basic, chromed-plastic eyeball and horizontal vents depending on application, but don't let this stop you from going one better. The company has all kinds of air-vent styles and types depending on how radical you intend to go. Check out the company's catalog for billet air vents that will make a huge difference in your interior's demeanor. What's more, you can paint or powdercoat these assemblies to match the rest of your interior. That's what we did. |
Mission Control
If you're going with the standard Hurricane system with manual controls, you'll use your Ford's factory heater control. A micro switch, included in the kit, is incorporated into the factory heater controls. This switch controls compressor clutch engagement. When closed, it carries power to compressor switches further down the line. Position this switch carefully, then mark the screw holes.
The compressor micro switch installs as shown here on a '67-'68 Mustang. Mark and drill a 1/8-inch screw hole. When the heater controls are moved to the "off" position, it closes the micro switch to begin current flow to the compressor clutch. With the fan off, there's no compressor-clutch engagement. If box temperature is below engagement value, then no compressor-clutch engagement will occur. And finally, if the pressure switch is open due to high or low pressure, no cigar there either. All switches in the chain must be closed for clutch engagement. Old Air Products also provides the fan switch necessary for Hurricane operation. This is a three-speed switch that, ironically, is the same basic design found in classic Fords. It has a three-pin plug that ties it to the blower motor. | 
Your Ford's factory heater control also controls the Hurricane unit. Simply tie the Hurricane's cables into your Mustang's heater control. Aside from air conditioning, each lever has the same function on the heat side. | 
Installed, the Hurricane's hot-water valve should look like this. There are two valves. When you need heat, this cable-controlled water valve allows the flow of hot coolant through the Hurricane's heater core. Underneath is a shut-off valve to turn off coolant flow for summertime use. |