Help! Noise in passenger footwell while AC is on and I brake
07-21-2017, 03:23 PM
#1
Junior Member
Thread Starter
Join Date: Feb 2011
Posts: 82
Likes: 0
Received 0 Likes
on
0 Posts
Car: 92 camaro RS
Engine: Moded 350 engine
Transmission: 5 speed
Help! Noise in passenger footwell while AC is on and I brake
Hi
So whenever I press the brake while I have the AC on a weird low pitched hissing and low pitched fluttering sound occurres. It stops when I stop braking and it stops when I change it off max AC. This is probably a vaccume issue. There was one point I had to much vaccume on it after the engine swap to carb and also it sometimes if I leave it on bi-level it gets stuck when going from bi-level to off, a little snap occurres whenever I make it go off. While car is off the mode sliding bar sounds normal. Slight hissing noise occurres when i go from any position to off. All the modes do what they are suppose to do, ie the air is properly directed.
I don't know the vent system well so any direction would be great
Help!
Thanks!
So whenever I press the brake while I have the AC on a weird low pitched hissing and low pitched fluttering sound occurres. It stops when I stop braking and it stops when I change it off max AC. This is probably a vaccume issue. There was one point I had to much vaccume on it after the engine swap to carb and also it sometimes if I leave it on bi-level it gets stuck when going from bi-level to off, a little snap occurres whenever I make it go off. While car is off the mode sliding bar sounds normal. Slight hissing noise occurres when i go from any position to off. All the modes do what they are suppose to do, ie the air is properly directed.
I don't know the vent system well so any direction would be great
Help!
Thanks!
07-21-2017, 05:16 PM
#2
Member
iTrader: (1)
Join Date: Jan 2017
Location: Dekalb, Il
Posts: 191
Likes: 0
Received 2 Likes
on
2 Posts
Engine: 3.1 V6
Transmission: 700R4
Axle/Gears: No idea
Re: Help! Noise in passenger footwell while AC is on and I brake
its a vacumm leak in the controls. there is a video in this thread:
https://www.thirdgen.org/forums/cool...ac-heater.html
or to buy a replacement valve:
http://www.top-downsolutions.com/ind...category_id=67
https://www.thirdgen.org/forums/cool...ac-heater.html
or to buy a replacement valve:
http://www.top-downsolutions.com/ind...category_id=67
Last edited by Cheerio; 07-21-2017 at 05:19 PM.
07-21-2017, 05:28 PM
#3
Junior Member
Thread Starter
Join Date: Feb 2011
Posts: 82
Likes: 0
Received 0 Likes
on
0 Posts
Car: 92 camaro RS
Engine: Moded 350 engine
Transmission: 5 speed
Re: Help! Noise in passenger footwell while AC is on and I brake
When I go to the off position and it getting suck makes sense that the rotary valve needs replacing. But does that explain the noise in the passenger footwell when I brake and the ac is on max?
Thank you for the link!!
Thank you for the link!!