? on temp/blower control module
 

got a quick question......

my Expy has been doing something weird lately

when i hv the a/c going... blowing out the vents.... it will all of a sudden switch to defrost for awhile then after a couple minutes switch back

It also has gotten stuck on a high temp also and i couldnt lower it manually til i restarted the truck.....??????

Do i need to replace that unit?
they prob hv one at the junkyard....the truck has 185000 miles on it too

Check for the infamous broken vacuum hose by the battery. Here's a thread on the issue.
https://www.ford-trucks.com/forums/8...t-vents-2.html