Three different datastream definitions for the L05 use the same chart of A/D to CTS values and based on the values it appears that inverted CTS is output on the ALDL. Is this how the conversion is set up for the scanner part of TP? If not, then the values you see when testing may not be correct. If you're monitoring events using ALDL data and you're unsure of the temp conversion, use the hex values.
The ALDL end is all documented in ALDL.ds charts, but I went to double check my work. Temps in ALDL datastream have always been correct from startup (ambient) to warmed up (T stat temp), data coming in is raw and goes to a lookup table.

Code:
 
5         COOLANT TEMPERATURE             SEE TABLE 1

Value of coolant X sent to lookup table, look up mode is Interpolate.
        
TABLE 1 --- COOLANT TEMPERATURE


         A/D            DEGREES
        COUNTS             C
        -------         -------
          255            -40
          251            -30
          250            -25
          247            -20
          245            -15
          241            -10
          237            - 5
          231              0
          225              5
          218             10
          209             15
          199             20
          189             25
          177             30
          165             35
          152             40
          139             45
          126             50
          114             55
          102             60
          92              65
          81              70
          72              75
          64              80
          56              85
          50              90
          44              95
          39             100
          34             105
          30             110
          26             115
          23             120
          21             125
          18             130
          16             135
          14             140
          13             145
          12             150
           0             200
So I believe ALDL temp data for comparing what is happening is accurate.

Since I see the same remarks in disassembly I'm wondering if this is where they got the info? And one parameter already has been proven to not need this, it was not marked 1KPUP, but had a conversion, take out conversion and it is accurate in hex compared to data stream Coolant temp.

But in TunerPro XDF looking at:
LD299 FCB 64 ; xxC COOL, Min for CLS LP Enable
Hex is 40h, TP shows in calculated view as 64d. Is it as simple as the decimal value shown for hex is Celcius?

Then I'll try and find a 1k pup one to test...