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Re: temp controller
RH picture looks like you have a chunk of the steel dash and definitely some of the bezel missing where the A/C controls used to bolt in.
In the LH picture it looks like someone completely disassembled the A/C control unit.
If you don't have all the pieces you'll need to find a complete one in a yard.
Left switch is the blower motor switch.
Center??? Does it have a cable attached? If so it might be the temp control.
Left is the Vacuum Mode selector switch. Be careful of those hoses. Be sure to hook them up to the same locations on the new control head and take care not to crunch them up or you'll have leaks.
The 1981 GM Light Truck service manual has a lot on the AC system in Chapter 10.
Schematics are in the back of the service manual.
Download all of the 81 service manuals at the link in my signature.
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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... 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.
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