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A/C intermittent blower issue

Tiny
MROULET1
  • MEMBER
  • 1999 CADILLAC DEVILLE
  • 4.6L
  • V8
  • AUTOMATIC
  • 104,500 MILES
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.
Tuesday, August 27th, 2019 AT 7:37 AM

1 Reply

Tiny
SCGRANTURISMO
  • MECHANIC
  • 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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Wednesday, August 28th, 2019 AT 11:48 PM

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