Coming into Coventry on the A46, take the exit marked "University" and "Stoneleigh", turn left at the T-junction at the top of the slip lane, then right (second exit) at the roundabout. Follow the road up to the traffic light junction with Kenilworth Road, and go straight on.
Follow Gibbet Hill Road down, go over one roundabout (second exit) and then right at the next one (3rd exit) onto University Road.
The first turning on the right (Car Park 10) and third turning on the left (Car Park 4/Sports Centre) lead to car parks which should be free on weekends.