So all my relays under the hood will start intermittently not working after the car is driving for about 10 mins. My car started to over heat and I noticed the fans were not coming on all the time. My ac does the same thing. If I jump the relay socket for the ac it will stay on fine. I thought of relays go bad they either stick opened or closed? Can they be intermittently working?

 

First reading overheat tends me to think a bad head gasket as it is so common in these engines...