VS Caprice Demister Circuit Help

Holden/Delco Tuning. ALDL, OBD 1.5. Circa 1989 to 2004.
Posts: 6
Joined: Tue Feb 22, 2022 10:04 am

VS Caprice Demister Circuit Help

Postby Flyingwide » Sat Apr 02, 2022 12:37 pm

Hi All,

I have another strange one. My VS Caprice L67 Auto has a relay clicking on and off constantly when the engine is running, whether it’s idling, driving or just started, it keeps clicking, and in turn the rear demister switch keeps clicking on and off. I’ve changed the LP check relay, and no difference, I’ve also disconnected the demister switch, and still the relay clicks on and off constantly and not particular pattern to it either. The relay clicking also makes a slight difference to idle, it increases load on the engine similar to an AC compressor cutting in and out. I don’t have a wiring diagram, so not sure what circuits share the rear demister circuit, but any help would be much appreciated.

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