Now that the UK mornings are getting a little cooler and wetter, I have noticed that my rear window demister switches off in less that a minute.

I have a 1996 Camaro Z28, is this normal or what do I need to do to increase the time before it switches off?

 

mine does the same, just push it on again

 

Normal time is around 10 minutes, then if turned on again 5 minutes..... Might be the switch is bad....

 

Wow, the start of the yearly question about the defogger shutting off too soon. It's like a ritual around here.

The age of the system seems to cause an increase in electrical resistance that causes the breaker to be over-taxed. I put in a 30 amp fuse in instead of the breaker years ago. It has worked fine ever since. Keep some spare fuses handy just in case you need them. They don't reset like a breaker. The power seats are on the same circuit.

 

I also used a fuse instead of the breaker, after putting two breakers in and both failed in about three weeks. The fuse hasn't failed yet, and it's been in there a couple of years.

 

Shoebox,

Many thanks - once again - you were spot on. Replacing the breaker with a fuse (of the same rating) has solved the problem.

Cheers,

Graham