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weak fwd air

Rainmann on Wed July 23, 2008 11:38 PM User is offline

Year: 2000
Make: chevy
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????

GM Tech on Thu July 24, 2008 2:53 AM User is offline

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....

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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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