Hongstertruck

My first year experience with A/C what appear to be on the weak side. Is it typical of this year and model 04-08? Or should it be a lot colder? Thanks for your input..

I might inject some R134a and see what happen.

Aeromech

I recently purchased my 2006 Lariat Super Crew and on the drive home noticed for the first time that my AC wasn't working. The next day I found that the system was flat so I sucked it down for 30 minutes with my vacuum pump. Turned off the pump and closed the valves to my gauges. System held tight for another 30 minutes. I shot a can of PAG oil in plus 3 12 oz. cans of R134A. Blows sometimes too cold now for my comfort. Job cost me roughly $20 since I already had the R134A I'd previously purchased off eBay.

Cutless009

The AC system on these trucks is pretty notorious for getting a leak, especially in the condenser (or so I've been told). For $10 you can have them run dye through it at a shop to see if it has a leak. Could be a good place to start.

If there is a leak and you re-pressurize the system, you'll just make the leak worse.

screamineagle

Pulling a good vacuum and starting from scratch can give good results at times. However, I recommend a leak test be done for the average Joe.

Hongstertruck

What is the trick to shoot some PAG oil in there? And, how many Oz did you use?

Hongstertruck

I don't like to use any shop. You don't think holding vacuum for 30 minutes is good enough leak test?

techrep

iTrader: (1)

that would work for me...

Hongstertruck

Since the A/C was still working some what I decided to add some refrigerant and take it from there.
So, I broke out my A/C service kit, I hooked up all the gauges and what not. Started the truck and turned on the A/C. After 5 minutes, I then record all the temp reading at the vent and pressure readings at the low and high pressure ports.

Temp at vent was 62 degree F.
Low pressure port was 40 PSI.
High pressure port was 220 PSI

I then started to charge the system at 0.2 LBS at a time.
At each iteration of charge I can see an improvement. The vent temperature started to drop and the low pressure also dropped.

I ended up used about 1 LBS of refrigerant. And here are the final readings.

Temperature at vent is 43 degree F.
Low pressure reading is around 32 PSI.
High pressure reading is 180 PSI.

Went out for a long ride, ambient temp today is around 88 F. The A/C is working great I can definitely tell that it is cold now.
Hope it will hang in there for a while, even if I have to do this once every other year it would OK by me.