diff --git a/checklists/z27ag-captures.json b/checklists/z27ag-captures.json
index ab84ae8..276c6c0 100644
--- a/checklists/z27ag-captures.json
+++ b/checklists/z27ag-captures.json
@@ -1,6 +1,6 @@
 {
   "id": "z27ag-captures",
-  "version": 4,
+  "version": 5,
   "title": "Z27AG decoding captures",
   "about": "docs/impl/plans/Z27AG-CAPTURES.md",
   "mark_format": "<step> <action>[ #<n>] start|end for a span, <step> <action>[ #<n>] for a point",
@@ -254,7 +254,7 @@
           "id": "14",
           "title": "Engine start",
           "do": "Cold start if possible: mark as the starter turns, then idle 60 s.",
-          "finds": "starting, coolant and oil warming, idle control",
+          "finds": "starting, coolant and oil warming, idle control; after standing overnight, every temperature sensor reads the outside temperature at the first frames, which scales 449 bytes 0, 1, 3 against OBD-II intake and coolant",
           "actions": [
             {
               "label": "engine start",
@@ -320,6 +320,25 @@
               "point": true
             }
           ]
+        },
+        {
+          "id": "32",
+          "title": "Temperature dial",
+          "do": "Engine warm (the heater needs it), blower on, A/C as it is. Sweep: from coldest to hottest a click or two at a time, a few seconds at each, then back; start at coldest, end back at coldest. Then hold hottest 5 min, and coldest 5 min, windows shut.",
+          "finds": "the dial setting on CAN (a byte stepping with each click); whether 449 byte 0 is the cabin temperature (it should drift up over the hot hold, down over the cold one)",
+          "actions": [
+            {
+              "label": "dial sweep"
+            },
+            {
+              "label": "hold hottest",
+              "hold_s": 300
+            },
+            {
+              "label": "hold coldest",
+              "hold_s": 300
+            }
+          ]
         }
       ]
     },
diff --git a/docs/impl/plans/Z27AG-CAPTURES.md b/docs/impl/plans/Z27AG-CAPTURES.md
index 13e462f..7449689 100644
--- a/docs/impl/plans/Z27AG-CAPTURES.md
+++ b/docs/impl/plans/Z27AG-CAPTURES.md
@@ -69,7 +69,7 @@ recorder refuses marks with "no session" otherwise); engine off, doors shut.
   which kind of stretch it is). Any session holds raw IMU samples (`imu.bin`), so
   these can go in their own short session or with anything else.
 
-Version 4 (2026-10-15) adds step 31, one wheel at a time by hand. Version 3 (2026-10-14) adds the IMU calibration section. Version 2 (2026-10-13) adds the stands section and writes down the conditions the
+Version 5 (2026-10-15) adds step 32, the temperature dial (engine running section), and the overnight soak to step 14. Version 4 (2026-10-15) adds step 31, one wheel at a time by hand. Version 3 (2026-10-14) adds the IMU calibration section. Version 2 (2026-10-13) adds the stands section and writes down the conditions the
 first run showed matter: engine off and handbrake on for 1–13, foot brake held for
 the handbrake step, neutral with the clutch up for the revs.