Heating and a/c lights flashing like a strobe light. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

72timemachine · 08-11-2021, 04:07 PM

Hello,

Just as the title suggests, "sometimes" when I have the dashboard lights on in my 1990 c2500 Chevy, 5.7 liter, the climate control lights will flash very quickly like a strobe light. The lights which illuminate my gauges are not affected and work fine. I can also hear the engine's rpm over the music playing on the factory radio, I don't really mind that, however does that have to do with something in the ignition system?

If anyone has a remedy for this, would you please let me know. Thank you for any help.

**Palf70Step** · 08-15-2021, 06:33 PM

I have seen that before on my buddy's 90, and it was an issue in the head unit. We swapped it out with a spat he had.

08-11-2021, 04:07 PM	#1
72timemachine Registered User Join Date: Oct 2008 Location: los angeles ca Posts: 223	Heating and a/c lights flashing like a strobe light. Hello, Just as the title suggests, "sometimes" when I have the dashboard lights on in my 1990 c2500 Chevy, 5.7 liter, the climate control lights will flash very quickly like a strobe light. The lights which illuminate my gauges are not affected and work fine. I can also hear the engine's rpm over the music playing on the factory radio, I don't really mind that, however does that have to do with something in the ignition system? If anyone has a remedy for this, would you please let me know. Thank you for any help.

08-15-2021, 06:33 PM	#2
Palf70Step State of Confusion! Join Date: Jul 2002 Location: Gulfport, MS USA Posts: 48,486	Re: Heating and a/c lights flashing like a strobe light. I have seen that before on my buddy's 90, and it was an issue in the head unit. We swapped it out with a spat he had. __________________ Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God!



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