One problem related to headlight concealment device has been reported for the 2004 Chevrolet Impala. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Chevrolet Impala based on all problems reported for the 2004 Impala.
On going problem of moisture build up in head light housing. Dealer states that this is a problem for all chevy Impalas and nothing can be done except to "blow out" the moisture. This condition occurs everytime lights are turned on. Dealer calls this the greenhouse effect. Illumination of roadway at night is effected. Problem reported to gm however, complaint number 1-188065149, they did not indicate that this would be looked or addressed.