open light

[tomgok]

Anyone ever have a headlight come open on there C3 while driving with the lights off? During a small burst of acceleration I noticed the left head light come up

 

[Hib Halverson]

Anyone ever have a headlight come open on there C3 while driving with the lights off? During a small burst of acceleration I noticed the left head light come up

The headlights are vacuum operated on C3.

If you get one light up under acceleration, there's a check valve that's failed or a vacuum leak. It's a common problem on those cars.

The Service Manual has a vacuum diagram