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THE  Chevelle ONLINE INTERCHANGE MANUAL: 1964-72 AIR CONDITIONING SYSTEMS (OEM)

If you do not desire a replacement A/C unit by Vintage Air, this section is based on the parts that are available from GM and various aftermarket companies like Modine and Factory Air for 1964-72 Chevelles and other GM A-bodies.

The factory cutouts on the firewall differ between A/C and non A/C vehicles, and this section applies to concours restorations in which an OEM assembly is used. Internal parts vary, and the electrical parts, like the wiring harnesses, switches, and relays, and A/C casing assemblies, which will differ between every other model year. If restoring an original A/C unit, it is best to purchase new components; using the old stuff is like playing Russian Roulette.

A 1970 Oldsmobile Cutlass sedan, now a decaying hulk.  Look carefully at the firewall.  The Cutlass was originally a factory A/C car, since there is a small opening on the firewall.  Non-A/C cars will have a larger opening.

There are some non-A/C GMs that have aftermarket conversions, and most of the replacement parts for these units are hard to locate.  Companies like Sears and John E. MItchell have produced these aftermarket units, and most of these companies have either discontinued replacement parts, and/or have went out of business.

The parts listed are the usual A/C components that are commonly replaced when the A/C system is serviced.
EVAPORATOR CORE
This is the component that is located on the firewall, on the passenger side, which sticks out, and often referred to as the suitcase.
1968-72 Chevelle, El Camino, Monte Carlo, and GMC Sprint
*AC-Delco P/N 15-6184, which replaces OEM #3016985 for 1968 vehicles, and #3016987 for 1969-72 vehicles.
1968-72 BOP A-cars
*A/C Delco P/N 15-6177 fits 1968-72 BOP A-Bodies, which includes the 1969-72 Grand Prix. Note: the BOP part has a different line arrangement.
DRIER ASSEMBLY
*Drier assembly (AC-Delco P/N 15-1240) fits 1968-72 Chevelle/El Camino/Monte Carlo, as well as 1968/69 Buick Skylarks.
*P/N 15-1242 fits 1968-72 Pontiac Lemans and Grand Prix, as well as 1970-72 Buick Skylarks.
POA VALVE
*POA valve (AC-Delco P/N 15-5193) and expansion valve (P/N 15-5325) are service replacement parts available from AC-Delco, but may differ from the original.
BLOWER MOTOR
*Blower motor (AC-Delco 15-87) fits all 1964-72 A-bodies; there is a universal replacement available under P/N 15-8196.

HEATING AND ENGINE COOLING

This section covers engine cooling as well as heating. There are service replacements available, and both are manufactured by AC-Delco, Modine, and Factory Air. The fit and function is the same, except for the radiator, which might include characteristics like rib design or overall appearance.

If you desire a lower cost alternative, the wrecking yard is a good place to look, but be careful of heating/cooling components that have signs of corrosion, which can be characterized by the green residue that occurs when copper corrodes. Be careful of bent or damaged tubes, this is a costly repair.

HEATER CORE ASSEMBLY

*GM 3014782 (OEM) interchanges with the following:
Originally used with A/C equipped vehicles, dimensions 9 1/2 x 6 3/8 x 2 inches.
*Modine 4R702190 (service replacement) interchanges with the following:
Originally used with A/C equipped vehicles, dimensions 9 3/8 x 6 1/4 x 2 1/2 inches.
*GM 3014083 fits non-A/C vehicles, which covers all 1964-72 A-Bodies, dimensions 9 1/4 x 6 1/4 x 2 inches.

RADIATOR

The radiator dimensions vary with application, like engine size, and which options are available, like HD cooling and A/C.
The dimensions may be a tip when measuring a used radiator salvaged from the wrecking yard.
Note: Some of the radiators from the BOP/C cars of 1971-76 vintage will have a fitting on the RH tank for the 3/4" heater hose, which is the primary hose that flows antifreeze back into the radiator. Most of the OEM part numbers have been discontinued, and the wrecking yard might be the logical choice.
Copyright 1997, 1999 LSC Publications. If are there any comments, or any other interchange along the GM line that will allow donor parts for a Chevelle, feel free to e-mail me at seributra_d@yahoo.com.
References

*A/C components and part numbers courtesy of AC/Delco and Modine

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