How to Install Vintage Air A/C into a Vintage Corvette - Page 9

circuit breaker is secured to lower part of firewall

The circuit breaker was secured to the lower part of the firewall with two short self-tapping screws after connecting it to the positive side of the starter solenoid. Cable ties were used throughout the installation to keep both the wiring and hoses tidy.

metal fittings were wrapped with insulating press tape

The metal fittings of the suction line at the evaporator and the expansion valve are wrapped with insulating press tape. This stuff is very sticky, so moistening your fingers with some dish washing liquid makes handling it a bit easier.

The hose cover is secured to the firewall using the supplied nuts and bolts in the original OEM holes that previously retained the heater box cover.

A suction pump is used to evacuate the system for 35-45 minutes at a temperature of at least 85 degrees. On a cooler day the components can be heated with a hair dryer or by running the engine with the heater on before evacuating.

we achieved vacuum of -28 lbs for half an hour to check for leaks

We pulled and maintained a vacuum of -28 lbs. for a half hour to check for leaks. When we were satisfied the system was tight and leak-proof, we charged the system with 1.8 lbs. (28.8 oz.) of 134a refrigerant, using a digital scale to get the weight exact.

Here's the completed installation, all charged and ready to enjoy.

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