air conditioning manifold, also called the compressor hose, on C5s sometimes fails for unknown reasons; other times, it is caused by heat fatigue. Such is the case with our C5 project car here. When the stock exhaust manifold was removed and headers installed, proper clearance wasn’t made for the larger pipes and, as a result, the rubber portion of the A/C compressor hose, although insulated, had a melt-down, thus allowing refrigerant to leak out and causing the air conditioner to stop functioning. A/C manifolds were scarce there for a while when GM stopped making them, but we were able to get one  from Corvette Central and here’s what it took to replace it.,