Model: 1500 express van
Engine Size: 5.7
Refrigerant Type: 134
Ambient Temp: 80
Pressure Low: 35
Pressure High: 220
Country of Origin: United States
Forward air weak, rear air ok, with system running fwd I/P vent far passenger side 40-45 degrees, middle vents 50-55 degrees,
drivers side 60-65????? checked heater mixing door ok, got access to evap output air outboard side very cold inboard not so much.
expansion valve???? evap core????
Weak? is air flow CFM not adequate? Look for blockage in front of evap but behind blower motor- remove blower to check..
If air flow is not coming out at right position- look for vacuum leak under hood in vacuum control line.
Other than that- have refrigerant charge level checked- you most likely are too low on refrigerant to completely cool across entire front of evap...therefore the cooling right to left is affected....
The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......
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