AC fan 3 and 4 positions

["dmcorlando2003" <SundeQuick@xxxx>]

After my AC runs for awhile (30-45 min or so) Wen the Fan is on 3 or 
4 it cuts off. I kow the are on two seperate relays, one for 3 and 
one for 4. Whatis causing this...is it that they are over heating? 
Do they need to be replaced? (Should I swap them with one of the 
other relays like the high or low beam and try that first?)

Unfortunately I am never in a position to check them out when the fan 
stops.

Michael
Vin# 2944