Would anyone happen to know what would cause all my HVAC controls to work only on high????.... it's been doing this for a lil while now and it's startin to get annoying...

Thanks in advance for any help..

Keith P. Killed in action-4/27/06 '99 CSVT #2369/2760-7/28/99 New Recruit- 1998 EO CSVT # soon to come Black 106,xxx