Articles
There are several concerns with regards to the AC system on our cars. If your AC is cold, then leave it alone. If it fails to cool to your expectation, then servicing might be in order. A certified AC technician will reclaim any remaining freon from the system, then replace both shrader valves (under the caps-look like bicycle valve stems) and either clean or replace the orifice tube which is located within the low pressure line. After a leak test, the system can be refilled to proper specification.


If your system suddenly gets warm, makes noise or emits smoke, then a more dramatic problem has occurred. Compressor failures with the Nipendenso compressor are quite common. The compressor comes separate from the clutch so both must be ordered and are strongly suggested to be replaced as a set. The plenum must be removed for this procedure..


The Corvette AC system is engineered using several types of metals. Unfortunately, some of these metals don't quite like each other all that well. An example is the AC lines which are made of an aluminum alloy but attached with a steel nut to an aluminum thread. In many cases, these lines become frozen to the component (drier or evaporator) causing them to be damaged during the removal attempt.

 

Don't blame your local technician when this occurs, this is an existing engineering problem. All fittings should be treated with either a teflon tape or anti-sieze equivalent when reinstalled. Although the 90-93 ZR1's were designed using the no longer manufactured R12 type freon, these systems can be converted to the newer R134a freon using basically stock components after a thorough cleaning and resealing operation is performed. Obviously, the best time to consider the changeover is when the system requires a major repair such as a compressor change.


Note: Always have the accumulator/drier replaced when changing the compressor.

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