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Hissing sound from Air Conditioner on 97 Accord
I have a 97 Accord with a bit over 200K.
For the past 20K or so, I hear an intermittent hissing sound below the glove box when the AC switch is activated. Cooling seems to work fine, verified this summer in the scorching heat of the southwest. Other than being quite annoying, I am wondering if this is a clue that something is about to fail. Thanks |
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Hissing sound from Air Conditioner on 97 Accord
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Hissing sound from Air Conditioner on 97 Accord
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Hissing sound from Air Conditioner on 97 Accord
On Feb 16, 12:50 am, " >
wrote: > I have a 97 Accord with a bit over 200K. > For the past 20K or so, I hear an intermittent hissing sound below the > glove box when the AC switch is activated. Cooling seems to work fine, > verified this summer in the scorching heat of the southwest. Other > than being quite annoying, I am wondering if this is a clue that > something is about to fail. > Thanks The area behind the glove box is right where the A/C expansion valve resides on your Accord. You are just hearing the sound of refrigerant changing states from liquid to gas through the expansion valve (it is a designed-in restriction). IOW, it's normal. If the A/C system wasn't cooling properly in high temps and the refrigerant charge was full, then an excessive hissing noise near the glove box would lead me to believe that the expansion valve was stuck closed - also verifiable with pressure gauges. You have proven that this is not an issue by stating that you have adequate cooling in high temp weather. Toyota MDT in MO |
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Hissing sound from Air Conditioner on 97 Accord
On 16 Feb 2007 10:26:45 -0800, "Comboverfish" >
wrote: >On Feb 16, 12:50 am, " > >wrote: >> I have a 97 Accord with a bit over 200K. >> For the past 20K or so, I hear an intermittent hissing sound below the >> glove box when the AC switch is activated. Cooling seems to work fine, >> verified this summer in the scorching heat of the southwest. Other >> than being quite annoying, I am wondering if this is a clue that >> something is about to fail. >> Thanks > >The area behind the glove box is right where the A/C expansion valve >resides on your Accord. You are just hearing the sound of refrigerant >changing states from liquid to gas through the expansion valve (it is >a designed-in restriction). IOW, it's normal. If the A/C system >wasn't cooling properly in high temps and the refrigerant charge was >full, then an excessive hissing noise near the glove box would lead me >to believe that the expansion valve was stuck closed - also verifiable >with pressure gauges. You have proven that this is not an issue by >stating that you have adequate cooling in high temp weather. > >Toyota MDT in MO We recently replaced a compressor, drier and expansion valve on a Honda CRV. Had to warranty the damn expansion valve because it made a piercing whistle! All the while cooling just fine. Thank the good lord Jap evaporator boxes come out in 20 minutes as opposed to 6-10 hours like on some domestic vehicles. Don www.donsautomotive.com |
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Hissing sound from Air Conditioner on 97 Accord
On Feb 16, 2:25 pm, Don > wrote:
> On 16 Feb 2007 10:26:45 -0800, "Comboverfish" > > wrote: > > > > > > >On Feb 16, 12:50 am, " > > >wrote: > >> I have a 97 Accord with a bit over 200K. > >> For the past 20K or so, I hear an intermittent hissing sound below the > >> glove box when the AC switch is activated. Cooling seems to work fine, > >> verified this summer in the scorching heat of the southwest. Other > >> than being quite annoying, I am wondering if this is a clue that > >> something is about to fail. > >> Thanks > > >The area behind the glove box is right where the A/C expansion valve > >resides on your Accord. You are just hearing the sound of refrigerant > >changing states from liquid to gas through the expansion valve (it is > >a designed-in restriction). IOW, it's normal. If the A/C system > >wasn't cooling properly in high temps and the refrigerant charge was > >full, then an excessive hissing noise near the glove box would lead me > >to believe that the expansion valve was stuck closed - also verifiable > >with pressure gauges. You have proven that this is not an issue by > >stating that you have adequate cooling in high temp weather. > > >Toyota MDT in MO > > We recently replaced a compressor, drier and expansion valve on a > Honda CRV. Had to warranty the damn expansion valve because it made a > piercing whistle! All the while cooling just fine. Thank the good > lord Jap evaporator boxes come out in 20 minutes as opposed to 6-10 > hours like on some domestic vehicles. > > Donwww.donsautomotive.com Apparently the Japanese have a different lord when it comes to under dash service. Was this a Nippon Denso or Honda OEM TXV ... or an aftermarket unit? Toyota MDT in MO |
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Hissing sound from Air Conditioner on 97 Accord
> wrote: > >> I have a 97 Accord with a bit over 200K. >> For the past 20K or so, I hear an intermittent hissing sound below the >> glove box when the AC switch is activated. Cooling seems to work fine, >> verified this summer in the scorching heat of the southwest. Other >> than being quite annoying, I am wondering if this is a clue that >> something is about to fail. >> Thanks Its probably getting slightly low on refrigerant. IF it hisses shortly after the compressor cycles on, its probably a frothy mix of liquid and gas passing through the expansion valve rather than pure liquid as is normally the case. Nothing to worry about- ALL auto air-conditioners gradually lose charge around the compressor shaft seal. Its only a problem if it starts losing charge rapidly to the point it needs a recharge more often than every few years. |
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Hissing sound from Air Conditioner on 97 Accord
Don wrote:
Thank the good > lord Jap evaporator boxes come out in 20 minutes as opposed to 6-10 > hours like on some domestic vehicles. > > Don > www.donsautomotive.com Just for that anti-American remark, I'm bringing YOU my wife's 93 LH car the next time it needs that job. After all, you're only 5 minutes away from me :-p |
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Hissing sound from Air Conditioner on 97 Accord
On Fri, 16 Feb 2007 15:57:35 -0600, Steve > wrote:
>Don wrote: > > Thank the good >> lord Jap evaporator boxes come out in 20 minutes as opposed to 6-10 >> hours like on some domestic vehicles. >> >> Don >> www.donsautomotive.com > >Just for that anti-American remark, I'm bringing YOU my wife's 93 LH car >the next time it needs that job. After all, you're only 5 minutes away >from me :-p I didn't mention heater cores. Heater core removal can really suck on some domestic vehicles. It can really suck even worse on most ALL Japanese vehicles. Good thing the Jap heater cores rarely fail! Don www.donsautomotive.com |
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Hissing sound from Air Conditioner on 97 Accord
On 16 Feb 2007 13:18:09 -0800, "Comboverfish" >
wrote: >On Feb 16, 2:25 pm, Don > wrote: >> On 16 Feb 2007 10:26:45 -0800, "Comboverfish" > >> wrote: >> >> >> >> >> >> >On Feb 16, 12:50 am, " > >> >wrote: >> >> I have a 97 Accord with a bit over 200K. >> >> For the past 20K or so, I hear an intermittent hissing sound below the >> >> glove box when the AC switch is activated. Cooling seems to work fine, >> >> verified this summer in the scorching heat of the southwest. Other >> >> than being quite annoying, I am wondering if this is a clue that >> >> something is about to fail. >> >> Thanks >> >> >The area behind the glove box is right where the A/C expansion valve >> >resides on your Accord. You are just hearing the sound of refrigerant >> >changing states from liquid to gas through the expansion valve (it is >> >a designed-in restriction). IOW, it's normal. If the A/C system >> >wasn't cooling properly in high temps and the refrigerant charge was >> >full, then an excessive hissing noise near the glove box would lead me >> >to believe that the expansion valve was stuck closed - also verifiable >> >with pressure gauges. You have proven that this is not an issue by >> >stating that you have adequate cooling in high temp weather. >> >> >Toyota MDT in MO >> >> We recently replaced a compressor, drier and expansion valve on a >> Honda CRV. Had to warranty the damn expansion valve because it made a >> piercing whistle! All the while cooling just fine. Thank the good >> lord Jap evaporator boxes come out in 20 minutes as opposed to 6-10 >> hours like on some domestic vehicles. >> >> Donwww.donsautomotive.com > >Apparently the Japanese have a different lord when it comes to under >dash service. Was this a Nippon Denso or Honda OEM TXV ... or an >aftermarket unit? > >Toyota MDT in MO It was an aftermarket "AIR" brand from WorldPac. Perfect physical fit, proper pressures but developed an intolerable whisle about two days after the car was picked up. Don www.donsautomotive.com |
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