Post by
SpecDRacing »
https://forums.nicoclub.com/specdracing-u28175.html
Tue Apr 17, 2007 1:48 pm
Sorry, but this one is too easy to pass up. What your getting is actually a miniature snow storm created by ice accumulating on the evaporator core. Basically, your R134/R12 (whichever) might be a little low, or your expansion valve is not working properly (I think they have expansion valves). Anyway, your pressures arent right. What is happening is:
As the air passes through your evaporator core (from the blower motor) it gets cooled by the evaporator. This cooling causes condensation on the evaporator. When pressures in the A/C system arent proper, or the refrigerent is low, you get an evaporator that acts like a freezer. The ice builds inside the evaporator then starts to break off and exit through the vents.
Thats the "smoke you see". It probably smells funny because your vents, ducts, and the evaporator itself have funk in them (best way to describe it...basically, dead skin, cat hair, dandruff, pollen, etc.).
10 seconds was probably just enough time for a patch of ice to break free and be blown through the system.
Get the pressures checked and the amount checked (lbs.). As for smoke from wiring, blower motor, etc...... In all my years as a technician, I have never seen smoke exit the vents from that type of problem. More than likely, it will exit the dash near the windshield. The blower motors normaly just die, no magic smoke.
Again, get the pressures checked and the refrigerent level checked. I'd bet thats your problem.