1999 Burb Front A/C not cold

[CalessaSSracer]

This is the same thing as my 98!

[MT-2500]

Originally Posted by Figaros

OK, here are the readings

Low side at idle 32psi.
High side at idle 160 psi

Low side at 2000rpm 18psi to 50psi back and forth
High side 125psi to 160psi back and forth

Pressure reading show it may be a little low on R-134a

High side is low and low side at 2K should not be going up and down very fast or compressor should not be turning on and off very fast.

While you have the gauges on it add a can and see what it does.
If you get to much the high side will go way up and low side will climb up.
Add a little at a time and watch gauges.

But as 777stickman said conform the tempt door on front unit is switching all of the way back and forth.

You may have to remove the front temperature actuator the one on front of heater housing and switch it manually.
Set tempt to cold and remove actuator and check for the door being in cold position.
Feel for binding and listen for door to flop over from hot to cold.
If you can get actuator and door in full cold side put actuator back on and unplug actuator and try AC.

[grumpy5]

You are not alone. I am also having a similar problem. One thing I noticed was my aux fan was not kicking on when I turn on the a/c. I dont have the correct wiring print ( I've been using a chilton's book for up to 96) but I believe the fan should turn on when the a/c is on. My pressures are good( The high should be about twice the ambient temp) I took the lower valance panel off to see the blend door actuator and it appears to be in the full closed position. I haven't had time to go any further. Hopefully if we bang enough of this info around we can figure this out. Yes The fan is good, and I changed the relay. No help. My next step is to get a current witing diagram and go from there.

[Figaros]

I just added 3 - 13oz. cans of r-134. Wow, what a difference! Low pressure is still only at 35lb at idle but cold air is a blowen' out the front vents. What I don't get is why the rear vents still blew cold before I added anything, they both feed off the same compressor so......? Oh, well I guess I watch for leaks and enjoy cold air up front for now.
Thanks for all the help.

[MT-2500]

Originally Posted by Figaros

I just added 3 - 13oz. cans of r-134. Wow, what a difference! Low pressure is still only at 35lb at idle but cold air is a blowen' out the front vents. What I don't get is why the rear vents still blew cold before I added anything, they both feed off the same compressor so......? Oh, well I guess I watch for leaks and enjoy cold air up front for now.
Thanks for all the help.

You are welcome and thanks for posting back how it went.
If it is low on gas one unit will rob the other one of cooling.
Big dog eats the little dog.
MT

[CalessaSSracer]

It was cold in the rear now its cold up front!

[Figaros]

They are now both cold and working properly.