adding R134a to a 2002 Sienna

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Old 24 May 2012, 02:05 am   #1 (permalink)
Michael
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Default adding R134a to a 2002 Sienna

I have the exact same problem as this guy, and I'm wondering if the
solution is the same.

http://www.toyotafans.net/2004-sienn...cold-t4400.htm

I've seen cans of R134a at the store, and I'm wondering how difficult
this is to do. What are the specs on the minimum pressure at the low-
side charging port? This doesn't seem to be specified in the Haynes
manual I've got.

I'm guessing I should get a can of R134a that has a pressure gauge, so
I'll know how much refrigerant I need to add... if any.

Also, where exactly is the low-side charging port? Again, the Haynes
manual isn't very clear about *where* it is.

Thanks,

Michael
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Old 24 May 2012, 02:55 pm   #2 (permalink)
Michael
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Default Re: adding R134a to a 2002 Sienna

On May 23, 11:05*pm, Michael <mrdarr...@gmail.com> wrote:
> I have the exact same problem as this guy, and I'm wondering if the
> solution is the same.
>
> http://www.toyotafans.net/2004-sienn...cold-t4400.htm
>
> I've seen cans of R134a at the store, and I'm wondering how difficult
> this is to do. *What are the specs on the minimum pressure at the low-
> side charging port? *This doesn't seem to be specified in the Haynes
> manual I've got.
>
> I'm guessing I should get a can of R134a that has a pressure gauge, so
> I'll know how much refrigerant I need to add... if any.
>
> Also, where exactly is the low-side charging port? *Again, the Haynes
> manual isn't very clear about *where* it is.
>
> Thanks,
>
> Michael



I went over to Wal-Mart, and I noticed the cans with a pressure gauge
have a nice table printed on the can as to what the pressure should
be, depending on the ambient temperature. I also noticed they sold
cans without a pressure gauge (which were half the price as the ones
with a gauge). How on earth would you know when to stop, without a
gauge?!

I was about to buy a can with a gauge, then decided to do a little
more research before committing to a can. I have to go back there to
get a Father's Day gift anyway. =)


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Old 24 May 2012, 10:07 pm   #3 (permalink)
hls
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Default Re: adding R134a to a 2002 Sienna


"Michael" <mrdarrett@gmail.com> wrote in message
news:f95a3ab9-43a3-46ba-9e09-d9c02048c6bf@nl1g2000pbc.googlegroups.com...
>I have the exact same problem as this guy, and I'm wondering if the
> solution is the same.
>


It might be, or it might not be. You will need to measure the pressures in
the rear
system and see what is going on. If you dont achieve the specified
pressures, then
you have either a lack of refrigerant OR you have a mechanical problem with
the
compressor, valves, etc.

If you know how to do it, you can buy a can of refrigerant with a pressure
gauge,
and you can attach it to the vacuum side of the compressor. Add
refrigerant
very slowly until your pressure measurement reaches the value mandated. (You
can find this on your can of refrigerant or you can find it from the data
for your
particular application)

If you have adequate cooling, then you guessed correctly.

The more certain way is to take this beast to a competent refrigeration
mechanic
and avoid the mystery.



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Old 25 May 2012, 12:05 am   #4 (permalink)
hachiroku
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Default Re: adding R134a to a 2002 Sienna

On Thu, 24 May 2012 11:55:53 -0700, Michael wrote:

> On May 23, 11:05*pm, Michael <mrdarr...@gmail.com> wrote:
>> I have the exact same problem as this guy, and I'm wondering if the
>> solution is the same.
>>
>> http://www.toyotafans.net/2004-sienn...cold-t4400.htm
>>
>> I've seen cans of R134a at the store, and I'm wondering how difficult
>> this is to do. *What are the specs on the minimum pressure at the low-
>> side charging port? *This doesn't seem to be specified in the Haynes
>> manual I've got.
>>
>> I'm guessing I should get a can of R134a that has a pressure gauge, so
>> I'll know how much refrigerant I need to add... if any.
>>
>> Also, where exactly is the low-side charging port? *Again, the Haynes
>> manual isn't very clear about *where* it is.
>>
>> Thanks,
>>
>> Michael

>
>
> I went over to Wal-Mart, and I noticed the cans with a pressure gauge
> have a nice table printed on the can as to what the pressure should
> be, depending on the ambient temperature. I also noticed they sold
> cans without a pressure gauge (which were half the price as the ones
> with a gauge). How on earth would you know when to stop, without a
> gauge?!
>
> I was about to buy a can with a gauge, then decided to do a little
> more research before committing to a can. I have to go back there to
> get a Father's Day gift anyway. =)



Oh, you mean the "Blow up Cans"?

MAKE SURE YOU KNOW WHICH IS THE LOW SIDE BEFORE ATTACHNG THE CAN!!!!!!!!!!!!!!!!!!!!!!!!

I have also wrecked a compressor with this stuff.


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Old 25 May 2012, 01:38 am   #5 (permalink)
Michael
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Default Re: adding R134a to a 2002 Sienna

On May 24, 9:05*pm, hachiroku <hacir...@e86.GTS> wrote:
> On Thu, 24 May 2012 11:55:53 -0700, Michael wrote:
> > On May 23, 11:05*pm, Michael <mrdarr...@gmail.com> wrote:
> >> I have the exact same problem as this guy, and I'm wondering if the
> >> solution is the same.

>
> >>http://www.toyotafans.net/2004-sienn...cold-t4400.htm

>
> >> I've seen cans of R134a at the store, and I'm wondering how difficult
> >> this is to do. *What are the specs on the minimum pressure at the low-
> >> side charging port? *This doesn't seem to be specified in the Haynes
> >> manual I've got.

>
> >> I'm guessing I should get a can of R134a that has a pressure gauge, so
> >> I'll know how much refrigerant I need to add... if any.

>
> >> Also, where exactly is the low-side charging port? *Again, the Haynes
> >> manual isn't very clear about *where* it is.

>
> >> Thanks,

>
> >> Michael

>
> > I went over to Wal-Mart, and I noticed the cans with a pressure gauge
> > have a nice table printed on the can as to what the pressure should
> > be, depending on the ambient temperature. *I also noticed they sold
> > cans without a pressure gauge (which were half the price as the ones
> > with a gauge). *How on earth would you know when to stop, without a
> > gauge?!

>
> > I was about to buy a can with a gauge, then decided to do a little
> > more research before committing to a can. *I have to go back there to
> > get a Father's Day gift anyway. *=)

>
> Oh, you mean the "Blow up Cans"?



I suppose. I think they're also called Suicide Cans? =)


> MAKE SURE YOU KNOW WHICH IS THE LOW SIDE BEFORE ATTACHNG THE CAN!!!!!!!!!!!!!!!!!!!!!!!!



I am guessing... just a guess... but... I think I want to avoid the
one that has a letter "H" on it.

Besides, I hear the fittings won't fit on the HIGH side.


> I have also wrecked a compressor with this stuff.



Oh that reminds me. Should I get Toyota-branded R134A? Synthetic?
Wal-Mart stuff? Car Quest?

How did you wreck a compressor anyway?
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Old 25 May 2012, 08:28 am   #6 (permalink)
uncle_vito
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Default Re: adding R134a to a 2002 Sienna


>How did you wreck a compressor anyway?


You get overenergetic in your rate of adding R134a. It goes into the low
pressure side which is at the inlet to the compressor. You get liquid freon
in there and the compressor locks up and self destructs.

In answer to not having a pressure gauge, if lack of freon is the problem
then any additional will help. Just limit the addition to no more than two
cans. If the AC is not cooling at all, you are likely empty and two cans
will not overfill it.

You can also tell if you are sufficiently full by feeling the low pressure
line and seeing if it is cold or accumulating frost. If it is cold,, then
you have enough freon. Not totally full, but enough. So stop filling.


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Old 25 May 2012, 10:03 am   #7 (permalink)
Ralph Mowery
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Default Re: adding R134a to a 2002 Sienna


"Michael" <mrdarrett@gmail.com> wrote in message
news:1d956ab8-6bee-416a-b61a-a48c4ede3982@ra8g2000pbc.googlegroups.com...


>How did you wreck a compressor anyway?


The Low side is usually the larger pipe.

The refrigerant will normally come out of the can as a gas if held vertical.
If tiped over or held upside down, liquid will come out. The liquid can get
into the compressor and break the valves or cause other mechanical damage.

This is one area where if you have no idea what you are doing, you can cause
lots of damage to the system.

If the car is a 2002 and you have a leak, it probably needs to be repaired.
I had a 1991 Camry for 17 years and never had any cooling problems.
It is a closed system and does not get used up or wear out. It has to leak
out.


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Old 25 May 2012, 11:53 am   #8 (permalink)
Jeff Strickland
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Default Re: adding R134a to a 2002 Sienna

There are two ports, a High Side and a Low Side. The ports are different
sizes. You cannot connect to the wrong port.

Buy a can of R134a and follow the directions for NORMAL user service of the
system. For system repairs, this not gonna work, but to refresh the system,
it is fine.



"Michael" <mrdarrett@gmail.com> wrote in message
news:f95a3ab9-43a3-46ba-9e09-d9c02048c6bf@nl1g2000pbc.googlegroups.com...
>I have the exact same problem as this guy, and I'm wondering if the
> solution is the same.
>
> http://www.toyotafans.net/2004-sienn...cold-t4400.htm
>
> I've seen cans of R134a at the store, and I'm wondering how difficult
> this is to do. What are the specs on the minimum pressure at the low-
> side charging port? This doesn't seem to be specified in the Haynes
> manual I've got.
>
> I'm guessing I should get a can of R134a that has a pressure gauge, so
> I'll know how much refrigerant I need to add... if any.
>
> Also, where exactly is the low-side charging port? Again, the Haynes
> manual isn't very clear about *where* it is.
>
> Thanks,
>
> Michael


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Old 25 May 2012, 12:20 pm   #9 (permalink)
NM5K
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Default Re: adding R134a to a 2002 Sienna

On 5/25/2012 12:38 AM, Michael wrote:

>
> I suppose. I think they're also called Suicide Cans? =)
>
>
>> MAKE SURE YOU KNOW WHICH IS THE LOW SIDE BEFORE ATTACHNG THE CAN!!!!!!!!!!!!!!!!!!!!!!!!

>
>
> I am guessing... just a guess... but... I think I want to avoid the
> one that has a letter "H" on it.
>
> Besides, I hear the fittings won't fit on the HIGH side.
>
>
>> I have also wrecked a compressor with this stuff.

>
>
> Oh that reminds me. Should I get Toyota-branded R134A? Synthetic?
> Wal-Mart stuff? Car Quest?
>
> How did you wreck a compressor anyway?


They don't like liquid..
One can use no gauges if the vehicle has a sight glass, but it
may not.. My Corolla doesn't have one.
So you oughta buy the gauge..
One note, to get an accurate reading of the low side pressures,
and also to speed charging, you will need to get the engine off
idle.. About 1500 rpm or so should do it.. Just watch the pressure
dive when you give it the gas.. When it bottoms out, you have
enough rpms..
Also.. purge the lines before you charge.. IE: crack the
hose connections when connected to the system as to bleed out
the air that is on the hoses. Ditto for the charge hose from
the can. You don't want air getting into the system.
Air is a non condensable, and will cause excess high side
pressures.
If the low side line has a good sweat back, it's pretty close.
If freezing frost, or warm with no condensation, it's low.
The evaporator coil temp drops as you get low on refrigerant,
which causes moisture to freeze.
Also, when charging, turn all the inside blowers on full blast.
Front and back.
It doesn't matter what brand.. 134a is 134a..


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Old 25 May 2012, 12:26 pm   #10 (permalink)
Jeff Strickland
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Default Re: adding R134a to a 2002 Sienna


"Michael" <mrdarrett@gmail.com> wrote in message
news:07f22a29-fefb-4154-8407-e368ff8619eb@t2g2000pbl.googlegroups.com...
On May 23, 11:05 pm, Michael <mrdarr...@gmail.com> wrote:
> I have the exact same problem as this guy, and I'm wondering if the
> solution is the same.
>
> http://www.toyotafans.net/2004-sienn...cold-t4400.htm
>
> I've seen cans of R134a at the store, and I'm wondering how difficult
> this is to do. What are the specs on the minimum pressure at the low-
> side charging port? This doesn't seem to be specified in the Haynes
> manual I've got.
>
> I'm guessing I should get a can of R134a that has a pressure gauge, so
> I'll know how much refrigerant I need to add... if any.
>
> Also, where exactly is the low-side charging port? Again, the Haynes
> manual isn't very clear about *where* it is.
>
> Thanks,
>
> Michael



I went over to Wal-Mart, and I noticed the cans with a pressure gauge
have a nice table printed on the can as to what the pressure should
be, depending on the ambient temperature. I also noticed they sold
cans without a pressure gauge (which were half the price as the ones
with a gauge). How on earth would you know when to stop, without a
gauge?!

+++++++++++++++++++++++++++++++
You would not know unless you already owned a pressure gauge. Buy the can
with the gauge, then move the gauge to a new can next year. Honestly, you
should not need a new can every year, but the point is to save the gauge and
use it the next time you need another can.




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