99 Silverado A/C in and out....Help!

Whitelightning wrote:
> <g22dru RemoveThis @gmail.com> wrote in message
> news:1152215707.627727.52300@s26g2000cwa.googlegroups.com...
>> I have been trying for days now to locate/ fix my A/C issue. I have a
>> 99 Silverado that is not cooling as it should. When it cools, it is
>> fine, it is great. Sometimes it works, sometimes it doesn't. Can't
>> find a common denominator there. Anyway, I HAVE checked the refrigerant
>> and pressure levels are good (45psi). Then I replaced the low pressure
>> switch, no change. It appears that the compressor clutch isn't always
>> engaging. When it spins, the truck is cold and all is well....until it
>> stops. Does this sound like my high pressure switch may be going out or
>> what? What could it be? Thanks in advance.
>>
> 45 psi on the low side, clutch engaged, fan set to max, system set to
> recirculate, temperature control to full cold, is not good, its too high.
>
> Whitelightning
>
>
you pressure is probably ok....45 at idle right? Of coarse it would be
best to check the high side too. If you havent added freon don't worry
about it. Anyway, I would look closely at the compressor clutch. It
could be that its not kicking in when its hot. Get a test light and
monitor the clutch for 12v. If its got 12 volts to it and its not
kicking in its either the connection, ground or bad clutch.
 >> Stay informed about: 99 Silverado A/C in and out....Help! 

Whitelightning wrote:

> 45 psi on the low side, clutch engaged, fan set to max, system set to
> recirculate, temperature control to full cold, is not good, its too high.
>
> Whitelightning

you mean the pressure is too high? What would be the next step here?
Excuse my ignorance, I haven't dealt with the a/c stuff to much.
Thanks for looking!
 >> Stay informed about: 99 Silverado A/C in and out....Help! 

ShoeSalesman wrote:

> you pressure is probably ok....45 at idle right? Of coarse it would be
> best to check the high side too. If you havent added freon don't worry
> about it. Anyway, I would look closely at the compressor clutch. It
> could be that its not kicking in when its hot. Get a test light and
> monitor the clutch for 12v. If its got 12 volts to it and its not
> kicking in its either the connection, ground or bad clutch.

Correct, 45 @ idle. Great, I will try that this weekend.
Thank you very much for the advice! I appreciate it.
So the high pressure switch is probably NOT the culprit?

Thanks again.
 >> Stay informed about: 99 Silverado A/C in and out....Help! 

ShoeSalesman wrote:

> >
> If you rev the engine up a little you will find the low side pressure
> will go down. At about 2000 rpm it should be lower, like about 35
> (depends on some factors like temp outside, how well the fan works, how
> worn the compressor is, and of coarse amount of freon. The reason it
> does this is because the compressor simply works better when you rev it
> up. This however has nothing to do with your problem unless the low
> pressure goes too low like 25. If this happens it will kick out for a
> short time(low pressure switch)till it reaches about 50psi then kicks on
> again. If this is the case usually it means its low on freon but you
> really need to see the high side before adding freon (safely). If your
> 99 has never had freon added before it is most likely low, a loss of a
> small amount of freon is considered normal. In seven years I would
> expect it too be VERY low.

I will check the 12v on the compressor clutch this weekend as mentioned
before, but until then perhaps you could enlighten me on a couple of
things.....I bought the refrigerant refill/ lube/ complete kit from
Wally world and checked the pressure. That is where it said 45psi and
from the illustration, that appeared to be the "full-do not add" zone.
Is this different or the same as the amount of freon you mentioned.
There has been NO work on the A/C since I bought it new, so I assumed
that freon would be needed as well. Also, how might one check the "high
side"? I took the kit back and got my 30 bucks back since it appeared
to be {?} full. Would that kit be used to check high side too?
When we checked it on the 4th it was running fine and the clutch was
spinning and all was good. (I couldn't get it to not work) Of course,
as soon as I packaged up the kit and took it back, the clutch would not
spin and no cold air. Back and forth. Would it have made ANY difference
if we were able to have checked it while it was not working properly?

Thanks for all of your help ShoeSalesman. I appreciate your time.
 >> Stay informed about: 99 Silverado A/C in and out....Help! 

Dru wrote:
> Whitelightning wrote:
>
>> 45 psi on the low side, clutch engaged, fan set to max, system set to
>> recirculate, temperature control to full cold, is not good, its too high.
>>
>> Whitelightning
>
> you mean the pressure is too high? What would be the next step here?
> Excuse my ignorance, I haven't dealt with the a/c stuff to much.
> Thanks for looking!
>
If you rev the engine up a little you will find the low side pressure
will go down. At about 2000 rpm it should be lower, like about 35
(depends on some factors like temp outside, how well the fan works, how
worn the compressor is, and of coarse amount of freon. The reason it
does this is because the compressor simply works better when you rev it
up. This however has nothing to do with your problem unless the low
pressure goes too low like 25. If this happens it will kick out for a
short time(low pressure switch)till it reaches about 50psi then kicks on
again. If this is the case usually it means its low on freon but you
really need to see the high side before adding freon (safely). If your
99 has never had freon added before it is most likely low, a loss of a
small amount of freon is considered normal. In seven years I would
expect it too be VERY low.
 >> Stay informed about: 99 Silverado A/C in and out....Help! 

Dru wrote:
> ShoeSalesman wrote:
>
>> you pressure is probably ok....45 at idle right? Of coarse it would be
>> best to check the high side too. If you havent added freon don't worry
>> about it. Anyway, I would look closely at the compressor clutch. It
>> could be that its not kicking in when its hot. Get a test light and
>> monitor the clutch for 12v. If its got 12 volts to it and its not
>> kicking in its either the connection, ground or bad clutch.
>
> Correct, 45 @ idle. Great, I will try that this weekend.
> Thank you very much for the advice! I appreciate it.
> So the high pressure switch is probably NOT the culprit?
>
> Thanks again.
>
Not likely, but you need to diagnose it first. (see above) and check back.
 >> Stay informed about: 99 Silverado A/C in and out....Help! 

Dru wrote:
> ShoeSalesman wrote:
>
>> If you rev the engine up a little you will find the low side pressure
>> will go down. At about 2000 rpm it should be lower, like about 35
>> (depends on some factors like temp outside, how well the fan works, how
>> worn the compressor is, and of coarse amount of freon. The reason it
>> does this is because the compressor simply works better when you rev it
>> up. This however has nothing to do with your problem unless the low
>> pressure goes too low like 25. If this happens it will kick out for a
>> short time(low pressure switch)till it reaches about 50psi then kicks on
>> again. If this is the case usually it means its low on freon but you
>> really need to see the high side before adding freon (safely). If your
>> 99 has never had freon added before it is most likely low, a loss of a
>> small amount of freon is considered normal. In seven years I would
>> expect it too be VERY low.
>
> I will check the 12v on the compressor clutch this weekend as mentioned
> before, but until then perhaps you could enlighten me on a couple of
> things.....I bought the refrigerant refill/ lube/ complete kit from
> Wally world and checked the pressure. That is where it said 45psi and
> from the illustration, that appeared to be the "full-do not add" zone.
> Is this different or the same as the amount of freon you mentioned.
> There has been NO work on the A/C since I bought it new, so I assumed
> that freon would be needed as well. Also, how might one check the "high
> side"? I took the kit back and got my 30 bucks back since it appeared
> to be {?} full. Would that kit be used to check high side too?
> When we checked it on the 4th it was running fine and the clutch was
> spinning and all was good. (I couldn't get it to not work) Of course,
> as soon as I packaged up the kit and took it back, the clutch would not
> spin and no cold air. Back and forth. Would it have made ANY difference
> if we were able to have checked it while it was not working properly?
>
> Thanks for all of your help ShoeSalesman. I appreciate your time.
>
IF it cools well while its working you need to find out why its not
kicking the clutch in....back to the test light. Use the test light to
check both sides of switches like the low and high ones. When running
both wires to the switches should be hot. (current travels THROUGH
them). At the clutch one should be hot, one grounded.
 >> Stay informed about: 99 Silverado A/C in and out....Help! 

what engine do you have if it is the v6, the clutch is probably going out,
when the clutch gets hot the magnetic looses it magnetism thats why it work
fine when its cold, compressor on gm from 96-99 where not all that great

<g22dru.DeleteThis@gmail.com> wrote in message
news:1152215707.627727.52300@s26g2000cwa.googlegroups.com...
>I have been trying for days now to locate/ fix my A/C issue. I have a
> 99 Silverado that is not cooling as it should. When it cools, it is
> fine, it is great. Sometimes it works, sometimes it doesn't. Can't
> find a common denominator there. Anyway, I HAVE checked the refrigerant
> and pressure levels are good (45psi). Then I replaced the low pressure
> switch, no change. It appears that the compressor clutch isn't always
> engaging. When it spins, the truck is cold and all is well....until it
> stops. Does this sound like my high pressure switch may be going out or
> what? What could it be? Thanks in advance.
>



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 >> Stay informed about: 99 Silverado A/C in and out....Help! 

<g22dru DeleteThis @gmail.com> wrote in message
news:1152215707.627727.52300@s26g2000cwa.googlegroups.com...
>I have been trying for days now to locate/ fix my A/C issue. I have a
> 99 Silverado that is not cooling as it should. When it cools, it is
> fine, it is great. Sometimes it works, sometimes it doesn't. Can't
> find a common denominator there. Anyway, I HAVE checked the refrigerant
> and pressure levels are good (45psi). Then I replaced the low pressure
> switch, no change. It appears that the compressor clutch isn't always
> engaging. When it spins, the truck is cold and all is well....until it
> stops. Does this sound like my high pressure switch may be going out or
> what? What could it be? Thanks in advance.
>

I have a 2003 silverado with5.3 and the air conditioner cuts in and out when
its extreemly hot out. My father has a 2003 2500hd 6.0 and his does the
same thing.
 >> Stay informed about: 99 Silverado A/C in and out....Help! 

MINE IS A 2004 SILVERADO. I NOTICED YESTERDAY MY A/C WAS ACTING WEIRD
TOO. CUTS IN & OUT. COOL BUT NOT COLD. WHATS THE DEAL WITH CHEVY'S?
FIRST MY TRANS. SLIPPS WITH ONLY 53000 MILES ON THEN THIS WITH A/C. I
THOUGHT CHEVY'S WERE TOP NOTCH.
Jeremy Yeoman wrote:
> <g22dru.TakeThisOut@gmail.com> wrote in message
> news:1152215707.627727.52300@s26g2000cwa.googlegroups.com...
> >I have been trying for days now to locate/ fix my A/C issue. I have a
> > 99 Silverado that is not cooling as it should. When it cools, it is
> > fine, it is great. Sometimes it works, sometimes it doesn't. Can't
> > find a common denominator there. Anyway, I HAVE checked the refrigerant
> > and pressure levels are good (45psi). Then I replaced the low pressure
> > switch, no change. It appears that the compressor clutch isn't always
> > engaging. When it spins, the truck is cold and all is well....until it
> > stops. Does this sound like my high pressure switch may be going out or
> > what? What could it be? Thanks in advance.
> >
>
> I have a 2003 silverado with5.3 and the air conditioner cuts in and out when
> its extreemly hot out. My father has a 2003 2500hd 6.0 and his does the
> same thing.
 >> Stay informed about: 99 Silverado A/C in and out....Help! 

My 03 Silverado A/C gets warmer and warmer if I just sit still for to long
of a time, especially on a really hot day, I mean you'll end up having to
turn it off after a while because it'll start blowing out Hot Air, but when
I start driving it gets colder and colder again and works really good. When
your in a long line in a hot day trying to get into parking at some event,
it sucks. I had the A/C compressor take a dump once on me, and it had to be
replaced and flushed and recharged like a year after buying the truck. It
did it before, it does it now. Is that really how it is? My last truck had
no A/C, but I can't remember a time is someone else's car doing this either.


"CHROME" <MYCHROMECHEVY.RemoveThis@YAHOO.COM> wrote in message
news:1153230162.204905.322180@m79g2000cwm.googlegroups.com...
> MINE IS A 2004 SILVERADO. I NOTICED YESTERDAY MY A/C WAS ACTING WEIRD
> TOO. CUTS IN & OUT. COOL BUT NOT COLD. WHATS THE DEAL WITH CHEVY'S?
> FIRST MY TRANS. SLIPPS WITH ONLY 53000 MILES ON THEN THIS WITH A/C. I
> THOUGHT CHEVY'S WERE TOP NOTCH.
> Jeremy Yeoman wrote:
>> <g22dru.RemoveThis@gmail.com> wrote in message
>> news:1152215707.627727.52300@s26g2000cwa.googlegroups.com...
>> >I have been trying for days now to locate/ fix my A/C issue. I have a
>> > 99 Silverado that is not cooling as it should. When it cools, it is
>> > fine, it is great. Sometimes it works, sometimes it doesn't. Can't
>> > find a common denominator there. Anyway, I HAVE checked the refrigerant
>> > and pressure levels are good (45psi). Then I replaced the low pressure
>> > switch, no change. It appears that the compressor clutch isn't always
>> > engaging. When it spins, the truck is cold and all is well....until it
>> > stops. Does this sound like my high pressure switch may be going out or
>> > what? What could it be? Thanks in advance.
>> >
>>
>> I have a 2003 silverado with5.3 and the air conditioner cuts in and out
>> when
>> its extreemly hot out. My father has a 2003 2500hd 6.0 and his does the
>> same thing.
>
 >> Stay informed about: 99 Silverado A/C in and out....Help! 

JBDragon wrote:
> My 03 Silverado A/C gets warmer and warmer if I just sit still for to long
> of a time, especially on a really hot day, I mean you'll end up having to
> turn it off after a while because it'll start blowing out Hot Air, but when
> I start driving it gets colder and colder again and works really good. When
> your in a long line in a hot day trying to get into parking at some event,
> it sucks. I had the A/C compressor take a dump once on me, and it had to be
> replaced and flushed and recharged like a year after buying the truck. It
> did it before, it does it now. Is that really how it is? My last truck had
> no A/C, but I can't remember a time is someone else's car doing this either.

I live in Texas where it's hot as hell. I had the same problem that
you have with every GM vehicle I ever bought. I'm really not saying this
to bash GM but I bought my first Dodge Ram back in 2001 and I haven't
looked back. Ice cold air and no mechanical problems at all. Not even
the vibration that my 2000 Shakerado had.

Bob
 >> Stay informed about: 99 Silverado A/C in and out....Help! 

"Bob M" <ram1220.TakeThisOut@vzavenue.net> wrote in message
news:xoadnWGZCsro_CPZnZ2dnUVZ_vydnZ2d@texas.net...
> JBDragon wrote:
>> My 03 Silverado A/C gets warmer and warmer if I just sit still for to
>> long of a time, especially on a really hot day, I mean you'll end up
>> having to turn it off after a while because it'll start blowing out Hot
>> Air, but when I start driving it gets colder and colder again and works
>> really good. When your in a long line in a hot day trying to get into
>> parking at some event, it sucks. I had the A/C compressor take a dump
>> once on me, and it had to be replaced and flushed and recharged like a
>> year after buying the truck. It did it before, it does it now. Is that
>> really how it is? My last truck had no A/C, but I can't remember a time
>> is someone else's car doing this either.
>
> I live in Texas where it's hot as hell. I had the same problem that you
> have with every GM vehicle I ever bought. I'm really not saying this to
> bash GM but I bought my first Dodge Ram back in 2001 and I haven't looked
> back. Ice cold air and no mechanical problems at all. Not even the
> vibration that my 2000 Shakerado had.
>
> Bob

I'm not a big fan of Dodge Trucks. They have there own problems. I haven't
had any AC problems in a couple years, but when it's really HOT out and I'm
just sitting there, the AC Temp gets less and less cool and will actually
start blowing out warm air. Once I'm moving again it starts getting cold
once again, and it does get quite cool. This is the first Vehicle I've had
with AC! My last 77 Chevy truck, NO AC, my Old car I had, No AC. My
Parents Cars/Trucks never had AC when I was growing up. The only AC that
was around was a small Unit in my Parents Bedroom because my Dad worked
Graveyard, so slept during the day. It's almost like the fan is not pulling
enough Air though the Condenser when I'm just sitting there, yet the Engine
doesn't over heat. Just don't know if this is normal, or if I should just
bring it to the dealer and have them take a look at it again. It's
normally not a problem, but last year for example waiting behind a huge line
of cars to get into the State Fair, it was pretty HOT out, and I'm sitting
there cool, and after a bit, it's getting less and less cool, until it's
blowing out HOT Air. I hat to turn it OFF and Open the Windows. What's the
point of having AC if it's not going to work. No AC, in a Hot truck
sitting there waiting for the line to move up, very very slowly wondering
where the FU*K is my AC. Other then the AC, it's been a great truck.
 >> Stay informed about: 99 Silverado A/C in and out....Help!