How to Change a Thermostat Switch on a 1993 VW Cabriolet
- 1). Remove the negative battery terminal and then the positive battery terminal to disarm the Cabriolet's electrical system. Remove the battery tie-down. Pull the battery out of the vehicle.
- 2). Locate the two bolts on the bottom of the battery box, and remove them with an 8 mm socket. You will need at least a 4-inch extension bar to easily reach the bolts, as they are countersunk into the plastic. Pull the battery tray out of the vehicle to access the thermostat fan relay.
- 3). Locate the fan relay. It's a black relay module (see Resource for a photo of one). Unplug the relay and plug the new one into place.
- 4). Replace the battery tray and bolt it into place using the bolts you removed.
- 5). Place the battery back into the Cabriolet. Reconnect the battery positive terminal first and then negative terminal.