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**hatzie** · 06-06-2022, 07:31 PM

Something on the HVAC controller board is flaking out on you.
It'd be entertaining to point a Flir camera at the bare controller board after it starts freaking out.

Our 20 and 30 and 40 year old vehicles have various embryonic to fairly sophisticated controllers onboard. Eventually they will start to fail.

I watched an entertaining vid on that subject this weekend. Bill Herd was talking to Adrian Black about MOS fabbed chips on 1980's 8 bit computers and the fact that they were really never designed to last longer than about 10 years. They're all well past the time they should've dropped dead. The controllers in 1980's & 1990's vehicles are similar but not so popular that FPGA replacements for the internal chips are being made like the 8 bit computers from the 1980's.

06-06-2022, 07:31 PM	#2
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,915	Re: Help with HVAC issue Something on the HVAC controller board is flaking out on you. It'd be entertaining to point a Flir camera at the bare controller board after it starts freaking out. Our 20 and 30 and 40 year old vehicles have various embryonic to fairly sophisticated controllers onboard. Eventually they will start to fail. I watched an entertaining vid on that subject this weekend. Bill Herd was talking to Adrian Black about MOS fabbed chips on 1980's 8 bit computers and the fact that they were really never designed to last longer than about 10 years. They're all well past the time they should've dropped dead. The controllers in 1980's & 1990's vehicles are similar but not so popular that FPGA replacements for the internal chips are being made like the 8 bit computers from the 1980's. __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful.