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rear air is colder than front air

HarvO on Wed July 14, 2010 12:35 PM User is offline

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 User is offline

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.


"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 User is offline

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

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