Your 1994 Mustang doesn't use freon. It uses R134A refrigerant. Any automotive store should be able to assist you in finding the low pressure port and the materials that you would need in order to check, and recharge your system. If you should continue to have problems seek professional help. STRENGTH WITH HONOR JOE
134A
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The 2013 Ford Mustang has a 6-speed manual.
The 2012 Ford Mustang has a 6-speed manual.
The 2005 Ford Mustang has a 5-speed manual.
The 2006 Ford Mustang has a 5-speed manual.
The 2011 Ford Mustang has a 6-speed manual.
The 2003 Ford Mustang has a 5-speed manual.
The 2007 Ford Mustang has a 5-speed manual.
The 2010 Ford Mustang has a 5-speed manual.
The 2001 Ford Mustang has a 5-speed manual.
The 2009 Ford Mustang has a 5-speed manual.