Hissing Sound

[loose_end]

Dear All,

Engine : 4G15, 3 speed auto
Problem : Hissing sound
Location : Under the steering, dashboard area

There will be a hissing sound for about 30 second from time to time ( Only when the air con is on ). The hissing sound does cause a drag (negative load) in power. Usually only happens about 80km/h and above. Air con still cold.

What's your thought ?

 

[vr2turbo]

Dear All,

Engine : 4G15, 3 speed auto
Problem : Hissing sound
Location : Under the steering, dashboard area

There will be a hissing sound for about 30 second from time to time ( Only when the air con is on ). The hissing sound does cause a drag (negative load) in power. Usually only happens about 80km/h and above. Air con still cold.

What's your thought ?

Probably just the air con refrigerant passing through the system, at the expansion valve before the cooling coil. When air con compressor is on there will be a load on the engine....

 

[RENESIS VIII]

Probably just the air con refrigerant passing through the system, at the expansion valve before the cooling coil. When air con compressor is on there will be a load on the engine....

Sometimes I can hear such a sound too. Now your explanation revealed what it is. I can guess it has something to do with air cond but not sure which part of the system or what caused it.

 

[gunnerzz]

Sometimes I can hear such a sound too. Now your explanation revealed what it is. I can guess it has something to do with air cond but not sure which part of the system or what caused it.

expansion valve?

 

[RENESIS VIII]

expansion valve?

Expansion valve? What is that? Something in the air conditioning system?

 

[vr2turbo]

Expansion valve? What is that? Something in the air conditioning system?

To change liquid refrigerant to gas for cooling. Read more from these links...

http://www.autoaircon.co.za/Technical.htm

https://www.swtc.edu/Ag_Power/air_conditioning/lecture/expansion_valve.htm

 

[RENESIS VIII]

Speaking of air cond, the whole air cond system for the Myvi I have at home is busted. Brought to shop today, need RM1700 to fix it. Need change compressor, change condenser, clean all those piping/coil. The shop say now change to a brand called SWJ, if use original Denso, need over RM2k.

 

[vr2turbo]

Speaking of air cond, the whole air cond system for the Myvi I have at home is busted. Brought to shop today, need RM1700 to fix it. Need change compressor, change condenser, clean all those piping/coil. The shop say now change to a brand called SWJ, if use original Denso, need over RM2k.

Means compressor kaput and got debris is the system, need to change everything.....

 

[RENESIS VIII]

Means compressor kaput and got debris is the system, need to change everything.....

Yeah, compressor died.

 

[vr2turbo]

Yeah, compressor died.

Cannot be helped, change whole system.....

 

[lsm1991]

now ayam takut....... my ac had kaputed on me as well~

 

[RENESIS VIII]

now ayam takut....... my ac had kaputed on me as well~

For your car, everything also expensive.

 

[lsm1991]

For your car, everything also expensive.

hoho am hoping its just a leak in the evaporator.... the compressor i installed last year was almost new!! should bawak n get it checked out soon.

 

[RENESIS VIII]

hoho am hoping its just a leak in the evaporator.... the compressor i installed last year was almost new!! should bawak n get it checked out soon.

What are the symptoms and problems that you are facing? No cold air?

The one I had faced in Myvi would be a loud sound when the air cond is switched on. Some kind of whining sound like supercharger sound, lol. It has been going on like that for almost 3 years already until recently cold air stopped coming out.

 

[lsm1991]

What are the symptoms and problems that you are facing? No cold air?

The one I had faced in Myvi would be a loud sound when the air cond is switched on. Some kind of whining sound like supercharger sound, lol. It has been going on like that for almost 3 years already until recently cold air stopped coming out.

mine... its like this, installed the ac last year, all fine, then used it for maybe 1 month? then never used it again till earlier this month when i found it blew very little cool air (basically air is only 'slightly' cool). One thing i did notice was it did hiss every once in a while, and hissed more loudly when i reved the car up..... didnt realise that wasnt normal (my old lmst also hissed alot, but that was fine)

 

[RENESIS VIII]

mine... its like this, installed the ac last year, all fine, then used it for maybe 1 month? then never used it again till earlier this month when i found it blew very little cool air (basically air is only 'slightly' cool). One thing i did notice was it did hiss every once in a while, and hissed more loudly when i reved the car up..... didnt realise that wasnt normal (my old lmst also hissed alot, but that was fine)

How can you endure the hot weather without using air cond for so long?

Last time my car also got problem with air not cold. Then found out one of those air cond hose is leaking, so replaced it and everything is fine.

 

[vr2turbo]

mine... its like this, installed the ac last year, all fine, then used it for maybe 1 month? then never used it again till earlier this month when i found it blew very little cool air (basically air is only 'slightly' cool). One thing i did notice was it did hiss every once in a while, and hissed more loudly when i reved the car up..... didnt realise that wasnt normal (my old lmst also hissed alot, but that was fine)

Send for check, maybe gas leaked.....

 

[lsm1991]

How can you endure the hot weather without using air cond for so long?

Last time my car also got problem with air not cold. Then found out one of those air cond hose is leaking, so replaced it and everything is fine.

haha i have been driving all this while without ac.... office quite close by, and only drive in the mornings and evenings when it isn't terribly hot. Its only when it rains it becomes an issue, cannot bukak window, and if i seal everything up, vapour everywhere!!

 

[RENESIS VIII]

haha i have been driving all this while without ac.... office quite close by, and only drive in the mornings and evenings when it isn't terribly hot. Its only when it rains it becomes an issue, cannot bukak window, and if i seal everything up, vapour everywhere!!

You don't drive your car out for other occasions other than working?

When rain just turn on air cond.

 

[lsm1991]

You don't drive your car out for other occasions other than working?

When rain just turn on air cond.

generally, nope... not the most practical car around... and apparently none other than me likes driving around in a car without the ac, very strange :hmmmm:

no ac, rain datang.... have to drive faster.... if caught out, habis, stuck parking somewhere no diferent from a bike, cukur i atleast have a roof!