Auto Air Conditioning & Heater Repair: 1997 Suburban A/C workings, chevrolet suburban, orifice tube

Question
I own a 1997 Chevrolet Suburban,  Recently the forward air no longer blows cold air, the rear air is cool, but slightly above what it has been.

The static pressure on the system at 90deg ambient is 98-100 psi, running pressures are 25-60psi low and 125-130psi high.

Vaccum is good and all doors seem to function in the distribution box.

I assume the two systems are independant on the evaporator side since the hoses split before the condenser and the pump.

How can I troubleshoot this with the dual system?

Answer
The pressures appear to be a little on the low side. have you had to add any freon to the system lately ?. If so, You apparently have a small leak somewhere and you need to find this leak with a leak detector and after you fix the leak, Discharge the system, Replace the orifice tube, vacuum it down and install new freon.


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