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Evacuating A/C System

WARNING: This page is about a different car, the 1997 Jeep Wrangler, 1997 Jeep Grand Cherokee, and 1997 Jeep Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
  1. Close both valves on manifold gauge set. Connect manifold gauge set to high-side and low-side service valves. See SERVICE VALVE LOCATIONS  under SYSTEM SERVICE VALVES. Connect a hose to center connector on manifold gauge set and evacuation pump.
  2. Fully open both valves on manifold gauge set. Start evacuation pump, and operate it until a vacuum reading of 28 in. Hg is obtained on low-side gauge. If vacuum reading of 28 in. Hg cannot be reached,check for defective evacuation pump or leak in A/C system or gauge set. Repair or replace as necessary.
  3. When specified vacuum reading has been reached, close both valves on manifold gauge set. Turn off evacuation pump. Observe low-side gauge. Any loss of vacuum in 30 minutes indicates a system leak. See LEAK TESTING  . Repair any leaks.
  4. If vacuum remains steady, open valves, and continue operating evacuation pump for an additional 10 minutes. Close both valves, and stop evacuation pump.
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