Any1 else have this Aircon gremlin ?
Thread Starter
Instructor
Joined: Aug 2003
Posts: 139
Likes: 0
From: South Cave, Brough East Yorkshire
Any1 else have this Aircon gremlin ?
Hi, i have a wierd noise coming from my aircon and wondered if its normal on all C4 vettes - mines an 86.
The aircon seems to work fine - but - when i turn the a/c off, a few seconds l8er this very loud hissing / whistling noise develops. It lasts about 15 seconds and then dies off - snds a bit like one of those whilstling kettles boiling or an airbed deflating lol - but even louder.
It doesn`t seem to be mechanical in the sense of pulleys / compressor etc. cos it does exactly the same thing if my a/c has been on and I turn the engine off. It seems to be coming from the bulkhead area near the evaporator - but i can`t really tell if it is coming from there or from a pipe / valve nearby.
Also i think it seems to have something to do with the pressure cos when running the a/c and the temperature reaches the set level (electronic a/c control) and the cooling fan cuts off when cycling, then the noise comes back again - then once the fan starts the noise goes away after a few seconds. I could understand it more if something was leaking and it made the noise when the A/C was working flat out - but it seems to be the other way round !
Like i say it feels cold all of the time - but i wuld like to cure the problem if there is one. Maybe its just a characteristic but it seems too loud and annoying to be normal.
Any help is greatfully appreciated, cos I don`t really want my vette to sound like a kettle.
1 other thing - i`m putting some new bilstein shocks on in the next few days. Is there anything i should put on the shock body to stop them rusting in bad weather. I`m tempted to put a film of grease or something on them - but i dunno if it will attract the dirt and grit and increase the chance of it damaging the seals.
Tnx guys
:seeya
The aircon seems to work fine - but - when i turn the a/c off, a few seconds l8er this very loud hissing / whistling noise develops. It lasts about 15 seconds and then dies off - snds a bit like one of those whilstling kettles boiling or an airbed deflating lol - but even louder.
It doesn`t seem to be mechanical in the sense of pulleys / compressor etc. cos it does exactly the same thing if my a/c has been on and I turn the engine off. It seems to be coming from the bulkhead area near the evaporator - but i can`t really tell if it is coming from there or from a pipe / valve nearby.
Also i think it seems to have something to do with the pressure cos when running the a/c and the temperature reaches the set level (electronic a/c control) and the cooling fan cuts off when cycling, then the noise comes back again - then once the fan starts the noise goes away after a few seconds. I could understand it more if something was leaking and it made the noise when the A/C was working flat out - but it seems to be the other way round !
Like i say it feels cold all of the time - but i wuld like to cure the problem if there is one. Maybe its just a characteristic but it seems too loud and annoying to be normal.
Any help is greatfully appreciated, cos I don`t really want my vette to sound like a kettle.
1 other thing - i`m putting some new bilstein shocks on in the next few days. Is there anything i should put on the shock body to stop them rusting in bad weather. I`m tempted to put a film of grease or something on them - but i dunno if it will attract the dirt and grit and increase the chance of it damaging the seals.
Tnx guys
:seeya
Burning Brakes
Joined: Mar 2001
Posts: 1,200
Likes: 0
Re: Any1 else have this Aircon gremlin ? (Total Recall)
it is the internal AC system pressure equalizing. it is not normal to be very loud, but if it is working i would let it go.
[Modified by Rich_01659, 8:48 AM 8/29/2003]
[Modified by Rich_01659, 8:48 AM 8/29/2003]
Burning Brakes
Joined: Aug 2002
Posts: 926
Likes: 2
From: chandler az
Re: Any1 else have this Aircon gremlin ? (Total Recall)
That is completely normal. I will be more pronounced if it is hot outside. The orfice tube is what is making the noise as the pressure change is occuring in the A/C
Thread Starter
Instructor
Joined: Aug 2003
Posts: 139
Likes: 0
From: South Cave, Brough East Yorkshire
Re: Any1 else have this Aircon gremlin ?
kewl - guess i was worried 4 nothing - maybe mine has a slight obstruction somewhere making the noise louder??
Still whilst it keeps pumping out the cold air, as long as its not gonna damage anything, i`m not gonna mess with it.
Tnx for the info.
:cheers:
Still whilst it keeps pumping out the cold air, as long as its not gonna damage anything, i`m not gonna mess with it.
Tnx for the info.
:cheers:
