[franklinpoole]

My 97 Suburban LT is close to being sent to the scrap heap. I've been running a long thread on another A/C specific forum, but after replacing nearly the entire A/C system, piece by piece, I'm stuck with 70+degree air coming from the front vents. Rather than post the entire thing again here, I ask that someone take a look briefly at what I've done already and posted on the acsource.net forum.

http://www.acsource.net/acforum/viewtopic.php?t=4517

A short synopsis reads:
I've replaced:
Compressor, (three times, two defective replacements)
Pressure and vacuum hoses attached to same.
Condenser
Orifice Tube
Accumulator (twice since I had the system open so many times)
front evaporator (ruined when not able to remove accumulator)
Rear TXV valve
And yes, I have some familiarity with A/C systems although I'm not an expert. I vacuumed the system each time, and carefully measured oil when replacing the compressor and accumulator.

Have 56oz refrigerant in system and 50psi/250psi at 87 ambient idling with fans on condenser and 40/200 driving at 45mph. Lowest front vent temp is 70deg.

 

[franklinpoole]

How can I check the blender door? I've disconnected the heater lines and it didn't change the temps, but that may not matter if warm air is 'leaking' past the Evaporator.

I've replaced, and or cleaned everything downstream of the compressor. I've replaced the orifice tube three times. Now I'm sure it's clean. I've got fairly good pressures 250lb and 50lb idling at 90deg, but no cool air in front.

Is there some way to test/move the blender door without removing the dash? I know the heat works, as I checked last night while driving, and it quickly got to 100deg in the vents.