i have a 1999 vt executive series 2 wagon , i had a problem that when i turned the egnition key to off, the a/c blower fan kept running for another 30 seconds . Now i have the problem that the a/c blower fan will work on the lower fan speeds but it does not work on high . Has anyone had this problom and are able to advise me on what to look for for me to fix this problem