Quote Originally Posted by JMI View Post
I dealt with this same issue a few weeks ago on my 1989 535i. Locate main fuse box. Replace fuse #9 - 15 amps.
Once again, this forum proves that it's worth it's weight in gold! After driving around for six hours in the summer heat, I replaced the fuse and have a functioning horn and air conditioner.

Thank you both for your suggestions!!

Norman