2002 ac problem

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Old 13 Apr 2006, 04:43 pm   #1 (permalink)
Greg
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Default 2002 ac problem

I posted a while back about a problem with my ac on my 2002 Camry. At
the time the ac light would flash off and on and I could get the ac
working again by repeatedly flicking the fan off and on. I know-that
wasn't a fix but it got me by
That silly "patch" no longer works.
Here is what I notice. When I leave for work in the morning and the
temperature is below freezing the ac will stay on. At the end of the
day or any time during the day if the ambient air rises above the
freezing mark then the ac goes into it's flashing (not working) mode.
So it seems like the issue is possibly temperature related. If that is
true does it tell anybody anything about where the problem lies?
I know other people have had this same problem as they have emailed me
about it. Is there a solution that anyone would share?
Thanks
Greg

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Old 14 Apr 2006, 05:39 am   #2 (permalink)
qslim
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Default Re: 2002 ac problem

First step is to make sure the system is charged with the proper amount of
refrigerant.

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Old 14 Apr 2006, 05:46 am   #3 (permalink)
twothousandtwoto2007@yahoo.com
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Default Re: 2002 ac problem

Will an OBDII Diagnostic bring up any codes?


O2-

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Old 14 Apr 2006, 10:32 am   #4 (permalink)
mrdarrett@gmail.com
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Default Re: 2002 ac problem


qslim wrote:
> First step is to make sure the system is charged with the proper amount of
> refrigerant.



This sounds familiar... didn't someone just have this same problem,
spent "a lot of money" charging the refrigerant, then the problem was
compressor sensor (or maybe just compressor) related?

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Old 14 Apr 2006, 06:09 pm   #5 (permalink)
davidj92
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Default Re: 2002 ac problem

mrdarrett@gmail.com wrote:
> qslim wrote:
>> First step is to make sure the system is charged with the proper
>> amount of refrigerant.

>
>
> This sounds familiar... didn't someone just have this same problem,
> spent "a lot of money" charging the refrigerant, then the problem was
> compressor sensor (or maybe just compressor) related?


Google is your friend.
Did a Google in groups for "ac flashing" in alt.autos.toyota and best info
is:
" It's one of the functions of the AC Amplifier module - when it engages the
compressor clutch, it monitors a rotation sensor inside the compressor
versus the engine RPM. If the speeds don't match, it thinks the compressor
is failing and locking up, or the clutch is
slipping and is going to burn up - they can't take too much slipping before
they get red hot, and you have a fire. So the module shuts off the clutch
to keep from breaking or throwing the drive belt, and the blinking light is
the trouble indicator."
I also agree with qslim, low charge could possibly cause a problem but, a
belt is a more likely first choice.
Dave


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Old 14 Apr 2006, 08:03 pm   #6 (permalink)
qslim
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Default Re: 2002 ac problem

I think a belt problem is less likely than a charge problem. If the belt
was loose, you'd have noises and also problems with all the other
accessories. About 3/4 of the AC problems we see in the shop are due to a
low charge. You certainly could go probing for problems with the
amplifier, pressure switch, thermistor, or clutch, but the first step a
tech would take is placing a manifold gauge set on the system and making
sure there is proper pressure in the system. Or at least quickly pop the
low side schrader valve open and see if you have any refrigerant at all.

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Old 15 Apr 2006, 05:08 pm   #7 (permalink)
davidj92
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Default Re: 2002 ac problem

qslim wrote:
> I think a belt problem is less likely than a charge problem. If the
> belt was loose, you'd have noises and also problems with all the other
> accessories. About 3/4 of the AC problems we see in the shop are due
> to a low charge. You certainly could go probing for problems with the
> amplifier, pressure switch, thermistor, or clutch, but the first step
> a tech would take is placing a manifold gauge set on the system and
> making sure there is proper pressure in the system. Or at least
> quickly pop the low side schrader valve open and see if you have any
> refrigerant at all.


I agree with you and am not recommending an out of the ordinary test
sequence for a tech but, the first thing a DUI'er could do is check the belt
and that's the point I was trying to make but guess I wasn't clear on. I'm
not sure on his model but on my '97 Camry the serpantine that drives the ac
pump drives the alternator and possibly the p.s. and is set to proper
tension by a manual tensioner bolt instead of a spring-loaded tensioner. Out
of all the accessories, with the exception being the p.s. being forced into
the stops, the ac compressor takes the most belt energy to turn and will be
the first to slip if there is a problem with the belt. The amplifier would
interpert this slippage as the compressor locked up or clutch slipping and
shut the ac off. I've seen belts slip and not make a noise and you probably
have also, although I agree it usually will.
A rule of thumb for a DUI'er is to grab the belt in the middle of the
longest span and twist it sideways. If it twists to appx 45 deg. with little
resitance then it should be tight enough. This is NOT an end-all test
though, there are specific deflection and/or tension specs. which should be
adhered to.
HTH, Dave


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Old 15 Apr 2006, 05:14 pm   #8 (permalink)
davidj92
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Default Re: 2002 ac problem

davidj92 wrote:
snip
> A rule of thumb for a DUI'er is to grab the belt in the middle of the
> longest span and twist it sideways. If it twists to appx 45 deg. with
> little resitance then it should be tight enough. This is NOT an
> end-all test though, there are specific deflection and/or tension
> specs. which should be adhered to.
> HTH, Dave


Another check I forgot to mention is to look at belt when twisting. If it
has a lot of cracks on the groove surface, portions missing, delaminating or
is glazed then it needs to be replaced.


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Old 15 Apr 2006, 06:45 pm   #9 (permalink)
qslim
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Default Re: 2002 ac problem

Thats a good point. I do suppose not everyone has a gauge set sitting
around.


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Old 20 Apr 2006, 11:17 pm   #10 (permalink)
JOSE CARMONA
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Default Re: 2002 ac problem

I recently had my AC led flash on my 2003 Camry. I took it to a mechanic
and all they did was pull out the fuses and the relay for the AC and
reinserted them and it worked. I am not saying that this is your problem,
but it's a start. In my case, my AC was not making noises at all. It went
from working to a blinking AC LED. Apparently I must have had a bad
contact.

--
JOSE CARMONA
"qslim" <Suckers@suckersdotcom> wrote in message
news:1c5c71a11c1ed6d79ecd24c7e2618508@localhost.ta lkaboutautos.com...
> Thats a good point. I do suppose not everyone has a gauge set sitting
> around.
>
>



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