A/C intermittent blower issue

1999 CADILLAC DEVILLE
104,500 MILES • 4.6L • V8 • AUTOMATIC
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MROULET1
  • MEMBER
  • 79 POSTS
My A/C works great sometimes and other times it acts funny with blowing. One time it was started blowing hot. I looked up and the temperature changed. To me it seem to act crazy the longer I drive and my anti-theft light is on.
Aug 27, 2019 at 7:37 AM
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SCGRANTURISMO
  • CERTIFIED EXPERT
  • 4,897 POSTS
Hello,

This could be a problem with your vehicle's Platform Zone Module (PZM) which is what Cadillac calls this model's Body Control Module (BCM). In the diagrams down below I have included the factory diagnostic troubleshooting guide for the TZM, but you will need a scan tool with the ability to communicate with the TZM to do these tests. Please go through this guide and get back to us with what you are able to find out.

Thanks,
Alex
2CarPros
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Aug 28, 2019 at 11:48 PM