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vents not working properly

richiebankrupt on Thu August 07, 2008 6:33 PM User is offline

Year: 2000
Make: chevrolet
Model: astro van
Engine Size: 4.3
Refrigerant Type: 134-a
Country of Origin: Uruguay

vents not blowing hard (driver/passenger), but the rear A.C. and defogger vents seem to be working good. Sometimes when I switch the fan speed or A.C. to max A.C. it will work. But that do not work anymore. Can anyone give me some ideas? Thanks

GM Tech on Thu August 07, 2008 9:05 PM User is offline

So does the air come out elswehere? like the defrost ducts? if so look for a vacuum leak - in black plastic line in front of throttle body- underhood

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......

johnboy123 on Fri August 08, 2008 7:51 AM User is offlineView users profile

it appears that you may have a vacuum problem. under the hood on the passenger side there is a black plastic line going through the fire wall - check it out for leaks to the vacuum source. if that appears to be in good shape the problem could be on the vacuum modulator that operates the blend door and can be easily checked out. one the drivers side just above the gas pedal there is a vacuum module that operates the blend door (changing the air flow from defrost to vent/floor). see if that is in good working order. good luck

NickD on Fri August 08, 2008 9:52 AM User is offline

Either that or your air circuit, works like a vacuum cleaner cleaning up all the debris in the world that ends up on the face of your evaporator. Blower motors and circuitry aren't necessarily designed to last the life of the vehicle either, while I have commented on what the replacement cost of these toys could buy a 3 foot fan driven by a precision weather tight motor, haven't been able to make these fit.

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