Air conditioner '88 Camry

Hi all,

A/C on my 4-cyl. LE version went down in performance.
I took it for cervice, and they charged it with freon.
Now it cooling wery well, BUT: past 30-40 minutes of work
it starts blowing extremely wet and cold air, and after a minute of
doing this it stops cooling completely.
I'm able to resart it only in a few minutes.

Could this be caused by too much freon in the A/C system? Or wrong
freon type? (invoice said they used R-12)
Any suggestions how to solve this issue?
Thanks,

Vassa

On Sun, 12 Jun 2005 07:36:36 -0700, Vassa wrote:
[color=blue]
> Hi all,
>
> A/C on my 4-cyl. LE version went down in performance.
> I took it for cervice, and they charged it with freon.
> Now it cooling wery well, BUT: past 30-40 minutes of work
> it starts blowing extremely wet and cold air, and after a minute of
> doing this it stops cooling completely.
> I'm able to resart it only in a few minutes.
>
> Could this be caused by too much freon in the A/C system? Or wrong
> freon type? (invoice said they used R-12)
> Any suggestions how to solve this issue?
> Thanks,
>
> Vassa[/color]


Take it off Recirc. Your heavy breathing (sorry, couldn't resist... ;)
Er, your breath contains moisture. On Recirc it does just
that...recirculates the cabin air through the car. The moisture builds up
in the mini 'eco-system' in your car is building up.

However, why it stops cooling is beyond me. One of the MDT's perhaps?
Try using fresh air and see what happens...

I tried to shut recirculation off...
It doesn't help, A/C doing the same damn thing!

"Vassa" wrote:[color=blue]
>Hi all,
>
>A/C on my 4-cyl. LE version went down in performance.
>I took it for cervice, and they charged it with freon.
>Now it cooling wery well, BUT: past 30-40 minutes of work
>it starts blowing extremely wet and cold air, and after a minute of
>doing this it stops cooling completely.
>I’m able to resart it only in a few minutes.
>
>Could this be caused by too much freon in the A/C system? Or wrong
>freon type? (invoice said they used R-12)
>Any suggestions how to solve this issue?
>Thanks,
>
>Vassa[/color]

It might have a slight overcharge but what is happening is that the
evaporator is actually freezing up and melting. Those old toy’s had
great AC. A work around would be to not use blower below level 3 and
use warm outside air for cooling siurce (not recirculate) when
possible and moderate temp a bit with temp control if needed and work
with it as is as it is managable.

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On 12 Jun 2005 07:36:36 -0700, "Vassa" <voronok@mail.ru> wrote:
[color=blue]
>Hi all,
>
>A/C on my 4-cyl. LE version went down in performance.
>I took it for cervice, and they charged it with freon.
>Now it cooling wery well, BUT: past 30-40 minutes of work
>it starts blowing extremely wet and cold air, and after a minute of
>doing this it stops cooling completely.
>I'm able to resart it only in a few minutes.
>
>Could this be caused by too much freon in the A/C system? Or wrong
>freon type? (invoice said they used R-12)
>Any suggestions how to solve this issue?
>Thanks,[/color]

Did the AC system in the car have a big leak they had to fix, or
sit unused and empty for a long time? If the system was exposed to
the air for a long time, more moisture could get inside than the
filter-drier could absorb, and the system could be icing up.

You get a few drops of water inside the sealed refrigerant system,
and they collect and clog the metering orifice on the firewall. When
the system stops working for a while the ice plug will melt, then it
starts working again. If that's the problem, the cure is to recover
all the refrigerant out of the system (running it through a big
filter/drier on the machine). The you change the filter-drier on the
car, pull a vacuum to get all the air out of the lines, and refill
with your reclaimed refrigerant. Might have to add a bit more.

That, or the "AC Amplifier" circuit needs adjusting. That's a
simple temperature control to sense ice buildup on the evaporator
core, and shut the compressor off to force the core to defrost.

--<< Bruce >>--

--
Bruce L. Bergman, Woodland Hills (Los Angeles) CA - Desktop
Electrician for Westend Electric - CA726700
5737 Kanan Rd. #359, Agoura CA 91301 (818) 889-9545
Spamtrapped address: Remove the python and the invalid, and use a net.

No, neither big leak, nor it stood with no freon. Sounds like ice biuld
up indeed.
I run A/C on recirc. and Lo fan speed...

"Bruce L. Bergman" <blPYTHONbergman@earthlink.invalid> wrote in message
news:j54pa1to56lfmsl1cm57rukm2k5vr5ml99@4ax.com...[color=blue]
> On 12 Jun 2005 07:36:36 -0700, "Vassa" <voronok@mail.ru> wrote:
>[color=green]
>>Hi all,
>>
>>A/C on my 4-cyl. LE version went down in performance.
>>I took it for cervice, and they charged it with freon.
>>Now it cooling wery well, BUT: past 30-40 minutes of work
>>it starts blowing extremely wet and cold air, and after a minute of
>>doing this it stops cooling completely.
>>I'm able to resart it only in a few minutes.
>>
>>Could this be caused by too much freon in the A/C system? Or wrong
>>freon type? (invoice said they used R-12)
>>Any suggestions how to solve this issue?
>>Thanks,[/color]
>
> Did the AC system in the car have a big leak they had to fix, or
> sit unused and empty for a long time? If the system was exposed to
> the air for a long time, more moisture could get inside than the
> filter-drier could absorb, and the system could be icing up.
>
> You get a few drops of water inside the sealed refrigerant system,
> and they collect and clog the metering orifice on the firewall. When
> the system stops working for a while the ice plug will melt, then it
> starts working again. If that's the problem, the cure is to recover
> all the refrigerant out of the system (running it through a big
> filter/drier on the machine). The you change the filter-drier on the
> car, pull a vacuum to get all the air out of the lines, and refill
> with your reclaimed refrigerant. Might have to add a bit more.
>
> That, or the "AC Amplifier" circuit needs adjusting. That's a
> simple temperature control to sense ice buildup on the evaporator
> core, and shut the compressor off to force the core to defrost.
>
> --<< Bruce >>--
>[/color]
Bruce's explanation regarding moisture in the system is a likely culprit. I
doubt if the amplifier needs adjusting since the OP's AC worked well in the
past.

--
Ray O
correct the return address punctuation to reply

"Vassa" <voronok@mail.ru> wrote in message
news:1118612503.772981.114830@o13g2000cwo.googlegroups.com...[color=blue]
> No, neither big leak, nor it stood with no freon. Sounds like ice biuld
> up indeed.
> I run A/C on recirc. and Lo fan speed...
>[/color]
Run it on fresh - the problem should disappear. If you run on recirc,
moisture builds up on the evaporator, which turns to frost, which makes the
system think it's too cold and then shuts down. Once the frost melts, then
it will re-start.
--
Ray O
correct the return address punctuation to reply

"Vassa" wrote:[color=blue]
>No, neither big leak, nor it stood with no freon. Sounds like ice
>biuld
>up indeed.
>I run A/C on recirc. and Lo fan speed...[/color]

There lays your problem, the core is over cooling and freezing solid
on the outside of it for low temps due to recirculated air and low
blower speed. Use outside air and/or a higher blower speed and it will
prevent the formation on ice on evaporater surface which eventually
blocks air flow thru it and stops cooling. My old camary used to do it
on occaision too if it was not too hot and the blower speed was to
low.

--
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