On 16 Feb 2007 13:18:09 -0800, "Comboverfish" <comboverfish@yahoo.com>
wrote:

>On Feb 16, 2:25 pm, Don <d...@NO-SPAMdonsautomotive.com> wrote:
>> On 16 Feb 2007 10:26:45 -0800, "Comboverfish" <comboverf...@yahoo.com>
>> wrote:
>>
>>
>>
>>
>>
>> >On Feb 16, 12:50 am, "techman41...@yahoo.com" <techman41...@yahoo.com>
>> >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