Automotive Air Conditioning Information Forum (Archives)

Provided by www.ACkits.com

We've updated our forums!
Click here to visit the new forum

Archive Home

Search Auto AC Forum Archives

Identifying valve core in 99 Suburban

ketch on Fri August 13, 2004 8:53 PM User is offline

99 Suburban 5.7L with dual a/c

Valve stem in high side leaking 134a, oil, and system not cooling anymore

Valve stem appears to be leaning over.

Solution I hope for is to buy a valve stem puller that will seal the system. Then all I need to do is add some R134a.

Problem:

I see there are valve stem pullers for different types of cores. There is a GM high flow valve remover. Does this apply to my Suburban? Does it have high flow or "large core" valves.

Or, do all R134a systems have the same size valve core? 16MM?

Thanks


-------------------------
We will never surrender....at least until they throw us out of the bar

TRB on Sat August 14, 2004 12:35 AM User is offlineView users profile

I believe on that vehicle the high side service port is replaced. The complete service port unscrews itself as the Schrader valve is not replaceable.

-------------------------

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

Chick on Sat August 14, 2004 8:24 AM User is offlineView users profile

As Tim stated, you have to change the whole fitting. Use AcDelco part number 15-5438 as shown below..Hope this helps..



-------------------------
Chick
Email: Chick

---------------------------------------------

Freedoms just another word for nothing left to lose

ketch on Mon August 23, 2004 10:08 PM User is offline

was not logged in .......

got this fitting installed, evacuated system, added 23oz R134a so far. Pressure readings were 42/230 (ls,hs). Manual I have says 33/233 but I realized just now this is for Tahoe - single evaporator system. Mine is dual evap. Anyone have a way to look up the pressures on a 1999 5.7L 2WD Chevy Suburban with dual a/c?

THanks



-------------------------
We will never surrender....at least until they throw us out of the bar

Edited: Mon August 23, 2004 at 10:09 PM by ketch

TRB on Mon August 23, 2004 10:20 PM User is offlineView users profile

Refrigerant capacity dual unit: 64 ounces.

Low Side Reading: 34 PSI
High Side Reading: 228 PSI



-------------------------

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

torque395 on Sun June 28, 2009 6:47 PM User is offline

Quote
Originally posted by: TRB
Refrigerant capacity dual unit: 64 ounces.



Low Side Reading: 34 PSI

High Side Reading: 228 PSI

I realize this post is like 5 years old but here goes.

This quoted post helps me out some too. I have a topic posted under "suburban AC" and by one person i'm being told the AC just isnt worth a d*mn in my truck and others say airflow issue. Someone else posted that their suburban had 45 degree vent temps on a 95 degree day and i was barely able to get 60 degrees while driving. Sometimes up to 80 at idle. Water over the condenser does drop the pressures, and the low side is right on the money with this posting, however the high side drops from 250 to 125 which is WAY off from what this posting states it should be. Now my truck is a 96, but a 99 should be the same. Other than that the only difference is my truck is diesel, and that really shouldnt matter. What would cause my low side to be correct and the high side to be low? I probably do have an airflow issue but there is another problem too. Even with water on the condenser it would only cool another 5 degrees cooler. So, with the pressure drop that i get and the fact that the engine heats up easily with a light trailer and AC on i would say yes i have an airflow issue (dirty radiator. fan clutch is fine) but until thats fixed i turned on the garden hose and set it to spray inside the grille at the condenser and radiator to get the system to read what it should read with the correct airflow. That is when i get 35 low 125 high and vent temp only drops 5 degrees.

-------------------------
1996 Chevy Suburban 2500 4x2 6.5L Turbo

Edited: Sun June 28, 2009 at 6:48 PM by torque395

Cussboy on Sun June 28, 2009 7:48 PM User is offline

I'd have the refrigerant recovered, measured, and correct amount added, I wonder if you're low on refrigerant as well as having the air flow issue. Suburbans cool well here in Arizona when all is operating correctly. Mine's a 1994 dual air.

torque395 on Sun June 28, 2009 10:29 PM User is offline

Its possible, this thing had a slow leak but i replaced the high side port (the thing pictured above) and the low side valve core. I was pretty sure that would cure my problem, but maybe not. The way I understand it, the HT6 compressor itself is pron to leakage. Its been good for a month or so tho so who knows. What can I expect a shop to charge me to recover and weigh the refrigerant? I'll have to work that into my budget, money is tight for me, as well as so many others, right now.

-------------------------
1996 Chevy Suburban 2500 4x2 6.5L Turbo

Bobby78 on Tue June 12, 2012 6:27 PM User is offline

Quote
Originally posted by: Chick
As Tim stated, you have to change the whole fitting. Use AcDelco part number 15-5438 as shown below..Hope this helps..





Back to Automotive Air Conditioning Forum

We've updated our forums!
Click here to visit the new forum

Archive Home

Copyright © 2016 Arizona Mobile Air Inc.