What does this ? (1 Viewer)

[T Y L E R]

Lately I've noticed something ....

I'll be sitting at a light . Even if the stereos on , I'll sense a loss of background noise , and simultaneously I'll feel the brake pedal drop slightly . Hell the first time this happened I immediately thought the vehicle was going to stall . Felt like I had lost engine power for an instant . It's cooler these days so I keep the defrost on ... which leads me to a question :

When you have the defrost on , does the AC light come on ? Mine does ... unless I change to the setting to the left of full defrost . I have my temperature setting up high , so why does the AC light up ? Makes me wonder if I have a defect of some sort that is casuing the defrost to set off the AC , and that musty be the noise I'm hearing ... AC compressor ??

• So is it AC ?
• Is this normal ?
• Why does my brake pedal drop ? ( when the comp. goes off ?)

Tyler

 

[alaskacruiser]

The AC coming on w/ defrost is normal- it helps to better defrost the windshield. Not sure on the brakes- haven't noticed that.

 

[sjcruiser]

Tyler,

AC is supposed to be on with front windshield defrost - it dehumidifies inside air.

I too have noticed a drop in the brake pedal at stoplights as well (not limited to my cruiser). I had thought it has air in the brake lines; but in that case the pedal travel would be in reverse direction. Really appreciate if someone could explain the rationals behind this though.

Regards,
Frank.

 

[GXO]

increased idle with AC on at a stop would increase vacuum on the booster....causing pedal to drop.

If your booster blows out...your pedal goes WAY down =)