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Was my A/C serviced properly?

1999 Tahoe 4x4 on Sun August 30, 2009 11:55 AM User is offlineView users profile

Year: 1999
Make: Checrolet
Model: Tahoe
Engine Size: 5.7
Refrigerant Type: 134
Ambient Temp: 85
Country of Origin: United States

This is how it all started: A/C cut off and did not reengage after 20min

I went to the A/C experts, who said my system needed to be recharged and I needed to be charged. I doubted that that was the case, but let myself being talked into the service and paying $273.33

My original symptoms in detail:
My otherwise well working A/C would cut off and not reengage. It would work on startup and work for about 20 minutes, or if I drove e.g. 10 minutes after initial startup (doing errands) and then stopped the truck, then the A/C would not reengage upon restarting the truck.

At the service, the system was evacuated and supposedly 3 pounds of refrigerant and some oil was added. My A/C got a bit colder, but the symptoms remained the same: A/C cut off and did not reengage after 20min

Consequently I went back. On my 2nd visit they changed the pressure switch next on the accumulator and supposedly added 1 more pound of refrigerant. My A/C got LESS cold!

My situation now:
1. I have green oil/dye leaking out of the service port on the low/cold side.
2. In idle the A/C stays on and does not cycle (Conditions: 85 degree outside temperature, fan low, tempsetting medium)
3. According to the GM-Manual, my system capacity is 2.75 pound, but according to the claims of the service station my system was charged with 4 pounds.

I went back to the tech a 3rd time to point out all of the above and specifically asked if my system was overcharged - the tech told me not to worry, and just wiped the dye away. He told me he does this for over 20 years.
In retrospect I don't even know how he measured the amount that he claims to have added. Indeed at the time as he claimed to have added an extra pound he just hooked up his hoses, opened his valves for about 30 seconds and looked at his pressure gauges.

I have no confidence in my A/C system and have not used it since. Any advice what to do?

earthworm on Sun August 30, 2009 12:49 PM User is offline

The same thing I tell the Saab owners, try to find a good service facility; stay away from the parts re-placers, who just tend to guess and shaft.
This is a national problem, and to an extent, the people have caused this...they want too much done for "free" and then cry when "free" becomes costly. And I am not safe from this either, maybe no one is.
I favor that a lot more money be spend in quality education - particularly the trades.

Apparently, your 20 year man has been doing things not as well as he should for 20 years.
At the place of leakage?, or is it seepage?, the O ring is slightly damaged.
And I am positive the system is overcharged....
This from an educated old man who is not an AC professional..
Thanx for havong the "Check Spelling".

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'96 900S
'97 Honda, air is inop

mk378 on Sun August 30, 2009 1:23 PM User is offline

It's going to be a clutch gap or electrical issue, which you still have. As it reliably got cold for a while every time you start out, the refrigerant was OK. Unless you have gremlins under the hood that take your R-134a out and put it back when you're not looking.

Of course it's overcharged now, also adding oil routinely is a bad idea as too much oil reduces cooling performance and can cause damage. Unfortunately it's a lot harder to get rid of excessive oil.

The dye probably just blew out when taking the hose off. Nothing to worry about there unless more comes out. Right now a leak would do you some good.

1999 Tahoe 4x4 on Sun August 30, 2009 4:07 PM User is offlineView users profile

The green oil/dye still keeps coming out on the cold side service port. It does so after I run the A/C a bit and turn it off, then the fluid starts appearing.

mk378 on Sun August 30, 2009 4:41 PM User is offline

There should be a plastic cap on the port. If there is, unscrew it and check the rubber gasket in the top of the cap. If you don't have a cap, get one from a junked car or a parts store.

1999 Tahoe 4x4 on Sun August 30, 2009 4:47 PM User is offlineView users profile

Gasket is in there and cap is tight. But forgive my ignorance, isn't that just a dust cap protecting the valve from foreign materials?

Dougflas on Sun August 30, 2009 5:00 PM User is offline

the cap ,is the primary seal.

1999 Tahoe 4x4 on Sun August 30, 2009 7:31 PM User is offlineView users profile

Huh, OK, so I sure have to get a cap then too.
How about the overcharging situation and the compressor always running?

GM Tech on Sun August 30, 2009 9:17 PM User is offline

Your original problem is mostly likely the clutch gap----your second problem was taking it to someone who "just thinks he has twenty years of experience" if he would listen to your symptoms he would be looking for freeze-up, or clutch gap which both fit your scenario....as described by you...

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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......

Chick on Mon August 31, 2009 11:16 AM User is offlineView users profile

find someone who specializes working on AC, not just a mechanic. Have the service ports or shrader valve changed, system evacuated and recharged the proper amount back into a deep vacuum, and have the clutch gap adjusted.,..

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

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Freedoms just another word for nothing left to lose

1999 Tahoe 4x4 on Tue September 01, 2009 10:07 PM User is offlineView users profile

Thank you guys. I apperciate all your comments. I'm going to find a reputable A/C shop.

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