Although we do not validate ALL car washes, we do take the Volt through many different types of car washes during the development/validation phase. In fact, during durability testing the Volt went through the automatic car wash several (100+) times and it also received a few hand washes! We even have a special car wash for testing on our Proving Grounds in Milford, MI. The Volt has been designed and validated to go through car washes without any issue - no need to remove the antenna. If fact, in most cases it is better to leave the antenna in place in order to keep water from getting into the antenna assembly.
Volt Advisor Trevor
Chevrolet Volt Advisor Team