Originally Posted by 1fatcat
EVAP core = evaporator core.
Well, the usual cause of cloged EVAP cores is pollen and mold. So just parking under trees is not neccisarily a cause. There is no air flow to draw this in when parked.
Daily driving through a streach of highway that has a lot of pollen floating around can cause the EVAP core to plug.
GM studies showed that a great way to prevent the EVAP core from plugging is to "blow dry" the core before shutting the car off.
If running the A/C, you should turn the compressor off about ten minutes before you get to your destination but leave the fan on high. This will help to dry the core.
A core set to sleep when wet is what promotes mold and clogging.
1fatcat, while we may appreciate the fact that you work at a dealer, again, our personal experience differs from yours. Would you like to see some pictures of foreign material pulled out of one? We have a few here. I had leaves in one of mine. I believe Hans had an entire ecosystem. Several others as well.
Now you see why I made the comment?