I have the dreaded AC light flashing

I have replaced the relay and didnt not completely fix my problem. Symptoms are : will work and cool at times, if I am on interstate and running same speed ac will cool most of times but if I slow down and in some instances hit a bump, ac will start flashing and stop cooling. Sometimes when I start truck up and get on my way it will work fine and then it will just start flashing. I know according to post that there is one other part the I have to check and maybe replace. Freon is full in compressor, relay not a complete fix, so Im curious as to whether my serpentine belt might be slipping some but its not squealing as I would expect. Could the belt be the problem ? I bought truck used and have no idea when the belt has been replaced or if it has ever. Any thoughts or suggestions greatly appreciated


Larry

 

https://www.tacomaworld.com/threads/a-c-light-blinking-troubleshooting-guide.440200/

 

Thank you !