The vans with auto temp control are a real pain in the ass, when they switch to low blower the air flow is not enough to keep the transistor or mosfet cool, and it fails. It has a hugh heat sink but needs more, was also told too good of a cabin filter leads to lower flow on low, killing the atc style resistor. I have had better luck with the Chinese resistor, but am sure that will change. In the winter remove the cabin filter.