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99 chevy 5.7 pressures?

daman on Mon June 23, 2008 9:44 PM User is offlineView users profile

Year: 1999
Make: chevy
Model: K1500
Engine Size: 5.7
Refrigerant Type: 134a
Ambient Temp: 75
Pressure Low: 20
Pressure High: 175
Country of Origin: United States

I have the factory amount in,2lbs(32oz's),pressures seem low,engine fan is good vent temps 40ish why they showing low,orifice is new, old one looked good,inlet and out let temps on the evap are the same temp(cold)some frost on low pressure line going out of the comp.????


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'00 Pontiac Sunfire 2200 I4 SFI
'99 Chevy 4x4 Z-71 5.7 Vortec v8 CPFI
'97 Chevy 4x4 6.5 Turbo Diesel 2500
'95 Pontiac Grand Am GT 3100 v6 SFI
'88 Chevrolet Camaro IROC 5.7 TPI(49,000 original miles)

Edited: Mon June 23, 2008 at 9:45 PM by daman

GM Tech on Mon June 23, 2008 10:24 PM User is offline

it is only 75 degrees out -- that's why

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The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

daman on Mon June 23, 2008 10:34 PM User is offlineView users profile

I was thinking that too,, but my FSM shows it should be a little higher,,i guess i'm good then,i'll leave it alone.

-------------------------
'00 Pontiac Sunfire 2200 I4 SFI
'99 Chevy 4x4 Z-71 5.7 Vortec v8 CPFI
'97 Chevy 4x4 6.5 Turbo Diesel 2500
'95 Pontiac Grand Am GT 3100 v6 SFI
'88 Chevrolet Camaro IROC 5.7 TPI(49,000 original miles)

MrBillPro on Mon June 23, 2008 10:34 PM User is offlineView users profile

Spray some water on the condenser and make sure your LPS is working, I have the same truck and my LPS opens at around 18 psi it may be yours is not working if your suction line is starting to freeze "OR" you could still be a tad low on refrigerant. I am am Home a/c professional and I personally would never trust a weighed in charge to many variables, but maybe you can get away with it on a vehicle.

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Don't take life seriously... Its not permanent.

Edited: Mon June 23, 2008 at 10:35 PM by MrBillPro

daman on Mon June 23, 2008 10:40 PM User is offlineView users profile

Sorry whats a LPS,more info please?

-------------------------
'00 Pontiac Sunfire 2200 I4 SFI
'99 Chevy 4x4 Z-71 5.7 Vortec v8 CPFI
'97 Chevy 4x4 6.5 Turbo Diesel 2500
'95 Pontiac Grand Am GT 3100 v6 SFI
'88 Chevrolet Camaro IROC 5.7 TPI(49,000 original miles)

MrBillPro on Mon June 23, 2008 10:50 PM User is offlineView users profile

Quote
Originally posted by: daman
Sorry whats a LPS,more info please?

Sorry, "Low Pressure Switch" most of the factory ones are fixed "non adjustable" I installed an adjustable one on my truck and tweaked
the charge it will freeze you out on 100 degree days in Houston.

-------------------------
Don't take life seriously... Its not permanent.

daman on Mon June 23, 2008 10:53 PM User is offlineView users profile

Ok yea how'd i miss that,lol anyway yea mine is working ok i think kicks off at around 18-17 psi wile
temps were 75 today,sound ok??

-------------------------
'00 Pontiac Sunfire 2200 I4 SFI
'99 Chevy 4x4 Z-71 5.7 Vortec v8 CPFI
'97 Chevy 4x4 6.5 Turbo Diesel 2500
'95 Pontiac Grand Am GT 3100 v6 SFI
'88 Chevrolet Camaro IROC 5.7 TPI(49,000 original miles)

chris142 on Mon June 23, 2008 10:56 PM User is offline

Quote
Originally posted by: daman
Ok yea how'd i miss that,lol anyway yea mine is working ok i think kicks off at around 18-17 psi wile

temps were 75 today,sound ok??yup

daman on Tue June 24, 2008 7:52 AM User is offlineView users profile

K thanks guy's...

-------------------------
'00 Pontiac Sunfire 2200 I4 SFI
'99 Chevy 4x4 Z-71 5.7 Vortec v8 CPFI
'97 Chevy 4x4 6.5 Turbo Diesel 2500
'95 Pontiac Grand Am GT 3100 v6 SFI
'88 Chevrolet Camaro IROC 5.7 TPI(49,000 original miles)

Edited: Tue June 24, 2008 at 8:04 AM by daman

GM Tech on Tue June 24, 2008 8:19 AM User is offline

Quote
Originally posted by: MrBillPro
I am am Home a/c professional and I personally would never trust a weighed in charge to many variables, but maybe you can get away with it on a vehicle.


Sure would look funny- having all those technicians in the assembly plant "tweaking" in the a/c charge amount so that they will work in Southwest, Northeast, Northwest, Southeast, all at the same time.....

Assembly plants actually use a big cylinder - like an oversized syringe" to put the exact amount in as tested for in the wind tunnels,,,,,


-------------------------
The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

MrBillPro on Tue June 24, 2008 10:21 AM User is offlineView users profile

Quote
Originally posted by: GM Tech
Assembly plants actually use a big cylinder - like an oversized syringe" to put the exact amount in as tested for in the wind tunnels,,,,,

But I already knew that, and I did not say this was a good idea to do as I did, I just said that this is what I did "BECAUSE" I do know what I am doing, remember I was an auto mechanic for 10 years before I got into the commercial and residential a/c business and I am even ASE certified from way back in 1972 been to the GM factory
back in 1969 that was a really nice experience, I may not show up much around here, but Tim will tell you that Mr. Bill is not clueless when it come to
automotive a/c I do have a clue.

-------------------------
Don't take life seriously... Its not permanent.

Edited: Tue June 24, 2008 at 10:23 AM by MrBillPro

GM Tech on Tue June 24, 2008 10:35 AM User is offline

Sorry if I offended you-- but I couldn't resist thinking of charging cars in the same way home units are done---I did not even look at who posted the comment..... guess you can't have any fun sometimes.....

-------------------------
The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

MrBillPro on Tue June 24, 2008 10:47 AM User is offlineView users profile

Quote
Originally posted by: GM Tech
Sorry if I offended you-- but I couldn't resist thinking of charging cars in the same way home units are done---I did not even look at who posted the comment..... guess you can't have any fun sometimes.....

Hey don't worry about it I was not offended at all I just basically wanted to explain that I do understand were your coming from as for as weighing in the charge, but I can tell you from experience you can tweak your auto a/c "if you have an adjustable LPS" and you know what your doing for your local, would it be profitable for GM or any other mfg. to do this of course not.

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Don't take life seriously... Its not permanent.

Edited: Tue June 24, 2008 at 10:47 AM by MrBillPro

TRB on Tue June 24, 2008 10:54 AM User is offlineView users profile

What's more important in this thread. Is how many grammar and spelling errors we can find!

Obviously any system can be tweaked a little from OEM. I'm sure GMTech has a few tricks up his sleeve many of us don't know. I also know the party line dealer mechanics pull sometimes is laughable. If an item does not drop into place for them! They have no will to see why it won't fit. I have fixed many R134a factory systems by tossing there condenser and installing a FSHE PF unit. Yep I had to make hoses and I changed the OEM configuration. But it was cooling in 110 plus AZ heat when it did not with the OEM setup.

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When considering your next auto A/C purchase, please consider the site that supports you: ACkits.com
Contact: ACKits.com

MrBillPro on Tue June 24, 2008 11:09 AM User is offlineView users profile

Quote
Originally posted by: TRB
What's more important in this thread. Is how many grammar and spelling errors we can find!


Hey I am from Texas I have an excuse.

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Don't take life seriously... Its not permanent.

brickmason on Wed June 25, 2008 1:17 AM User is offline

Ok boys, GM Tech go stand in that corner, Mr bill you go stand in that corner, Tim come here your getting a whipping.

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Just another brick in the wall

Had a little mule I fed him castor oil and every time he jumped the fence he fertilized the soil

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