Automotive Air Conditioning Information Forum (Archives)

HarvO on Wed July 14, 2010 12:35 PM

Year: 1998
Make: chevrolet
Model: suburban
Engine Size: 5.7 litr
Refrigerant Type: R134a
Ambient Temp: 90F
Pressure Low: 35psi
Pressure High: 260psi
Country of Origin: United States

I had to find and fix leak. It was the 9ft. suction hose going to rear evaporator. Replaced accumulator, front evaporator and added 3oz. of pag 150.Vaccumed system for 11/2 hrs. than charged with 64oz. of r134. Rear vent blows 40F. Front vent is 60-65F. I did not change the orfice tube.Should the front air be at least the same temperature as rear air? Could the orfice tube be causing the problem?

Edited: Thu July 15, 2010 at 9:36 AM by HarvO

bohica2xo on Wed July 14, 2010 1:01 PM

The orifice tube is the primary filter in the system. It is also the quick check for debris in the system, and the first part I look at after opening a CCOT system.

Yes, it is probably part of the performance issue. The other thing I find on 5.7 suburbans is dead fan clutches. If the system cools ok at 60 mph, and stinks in traffic the clutch is dead.

B.

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"Among the many misdeeds of the British rule in India, history will look upon the act of depriving a whole nation of arms, as the blackest."
~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446.

HarvO on Wed July 14, 2010 11:35 PM

Thanks for your advice. I will check the fan clutch and go from there.