More than likely R134a. It should be listed somewhere on the A/C unit.
Freon' is a brand name for 'refrigerant', the type of refrigerant used on early 1990 Honda Civics was R-12. Now a license is required for someone to properly charge the system so many owners have switched to R-134a.
According to the Auto Car website, the most popular Honda Civic is the Honda Civic Type R Mugen. The Mugen is a sporty type of Honda Civic with tail wings above the trunk of the vehicle.
No different dashboards and cluster wiring are involved. Honda also did not make an SI in 1991 and the car model and type is nearly completely different.
The 2014 Honda Civic has single overhead cam (SOHC).
The 2010 Honda Civic has single overhead cam (SOHC).
The 2005 Honda Civic has single overhead cam (SOHC).
The 2008 Honda Civic has single overhead cam (SOHC).
si on a Honda civic is the body type it means sport injection
Honda civic is faster but better?
The 2006 Honda Civic has single overhead cam (SOHC).
The 2004 Honda Civic has single overhead cam (SOHC).
The 2003 Honda Civic has single overhead cam (SOHC).