🎨 Standard 'cooldown' method

Marlin/src/gcode/control/M80_M81.cpp

  *      This code should ALWAYS be available for FULL SHUTDOWN!
  */
 void GcodeSuite::M81() {
-  thermalManager.disable_all_heaters();
   planner.finish_and_disable();
+  thermalManager.cooldown();
 
   print_job_timer.stop();
 
   #if HAS_FAN
-    thermalManager.zero_fan_speeds();
     #if ENABLED(PROBING_FANS_OFF)
       thermalManager.fans_paused = false;
       ZERO(thermalManager.saved_fan_speed);

Marlin/src/lcd/e3v2/creality/dwin.cpp

         queue.inject_P(G28_STR); // G28 will set home_flag
         Popup_Window_Home();
         break;
+
       #if HAS_ZOFFSET_ITEM
         case PREPARE_CASE_ZOFF:
           #if EITHER(HAS_BED_PROBE, BABYSTEPPING)
           #endif
           break;
       #endif
+
       #if HAS_PREHEAT
         case PREPARE_CASE_PLA: ui.preheat_all(0); break;
         #if PREHEAT_COUNT > 1
       #endif
 
       #if HAS_HOTEND || HAS_HEATED_BED
-        case PREPARE_CASE_COOL:
-          TERN_(HAS_FAN, thermalManager.zero_fan_speeds());
-          #if HAS_HOTEND || HAS_HEATED_BED
-            thermalManager.disable_all_heaters();
-          #endif
-          break;
+        case PREPARE_CASE_COOL: thermalManager.cooldown(); break;
       #endif
 
       case PREPARE_CASE_LANG:
         HMI_ToggleLanguage();
         Draw_Prepare_Menu();
         break;
+
       default: break;
     }
   }

Marlin/src/lcd/e3v2/enhanced/dwin.cpp

 // Ended print job
 void DWIN_Print_Finished() {
   if (checkkey == PrintProcess || printingIsActive()) {
-    thermalManager.disable_all_heaters();
-    thermalManager.zero_fan_speeds();
+    thermalManager.cooldown();
     HMI_flag.print_finish = true;
   }
 }
 #endif
 
 #if HAS_PREHEAT
-  void SetCoolDown() {
-    TERN_(HAS_FAN, thermalManager.zero_fan_speeds());
-    #if HAS_HOTEND || HAS_HEATED_BED
-      thermalManager.disable_all_heaters();
-    #endif
-  }
   void DoPreheat0() { ui.preheat_all(0); }
   void DoPreheat1() { ui.preheat_all(1); }
   void DoPreheat2() { ui.preheat_all(2); }
 #endif
 
+void DoCoolDown() { thermalManager.cooldown(); }
+
 void SetLanguage() {
   HMI_ToggleLanguage();
   CurrentMenu = nullptr;  // Invalidate menu to full redraw
       #if PREHEAT_COUNT > 2
         ADDMENUITEM(ICON_CustomPreheat, GET_TEXT_F(MSG_PREHEAT_CUSTOM), onDrawMenuItem, DoPreheat2);
       #endif
-      ADDMENUITEM(ICON_Cool, GET_TEXT_F(MSG_COOLDOWN), onDrawCooldown, SetCoolDown);
     #endif
+    ADDMENUITEM(ICON_Cool, GET_TEXT_F(MSG_COOLDOWN), onDrawCooldown, DoCoolDown);
     ADDMENUITEM(ICON_Language, PSTR("UI Language"), onDrawLanguage, SetLanguage);
   }
   CurrentMenu->draw();

Marlin/src/lcd/e3v2/jyersui/dwin.cpp

       #define PREPARE_MANUALLEVEL (PREPARE_HOME + 1)
       #define PREPARE_ZOFFSET (PREPARE_MANUALLEVEL + ENABLED(HAS_ZOFFSET_ITEM))
       #define PREPARE_PREHEAT (PREPARE_ZOFFSET + ENABLED(HAS_PREHEAT))
-      #define PREPARE_COOLDOWN (PREPARE_PREHEAT + ENABLED(HAS_PREHEAT))
+      #define PREPARE_COOLDOWN (PREPARE_PREHEAT + EITHER(HAS_HOTEND, HAS_HEATED_BED))
       #define PREPARE_CHANGEFIL (PREPARE_COOLDOWN + ENABLED(ADVANCED_PAUSE_FEATURE))
       #define PREPARE_TOTAL PREPARE_CHANGEFIL
 
             else
               Draw_Menu(Preheat);
             break;
+        #endif
+
+        #if HAS_HOTEND || HAS_HEATED_BED
           case PREPARE_COOLDOWN:
             if (draw)
               Draw_Menu_Item(row, ICON_Cool, F("Cooldown"));
-            else {
-              TERN_(HAS_FAN, thermalManager.zero_fan_speeds());
-              thermalManager.disable_all_heaters();
-            }
+            else
+              thermalManager.cooldown();
             break;
         #endif
 
         #define PREHEAT_TOTAL PREHEAT_5
 
         auto do_preheat = [](const uint8_t m) {
-          thermalManager.disable_all_heaters();
-          TERN_(HAS_FAN, thermalManager.zero_fan_speeds());
+          thermalManager.cooldown();
           if (preheatmode == 0 || preheatmode == 1) { ui.preheat_hotend_and_fan(m); }
           if (preheatmode == 0 || preheatmode == 2) ui.preheat_bed(m);
         };
               TERN_(HAS_HOTEND, pausetemp = thermalManager.temp_hotend[0].target);
               TERN_(HAS_HEATED_BED, pausebed = thermalManager.temp_bed.target);
               TERN_(HAS_FAN, pausefan = thermalManager.fan_speed[0]);
-              thermalManager.disable_all_heaters();
-              TERN_(HAS_FAN, thermalManager.zero_fan_speeds());
+              thermalManager.cooldown();
             #endif
           }
           else {
         if (selection == 0) {
           if (sdprint) {
             ui.abort_print();
-            TERN_(HAS_FAN, thermalManager.zero_fan_speeds());
-            thermalManager.disable_all_heaters();
+            thermalManager.cooldown();
           }
           else {
             TERN_(HOST_ACTION_COMMANDS, hostui.cancel());
 void CrealityDWINClass::Stop_Print() {
   printing = false;
   sdprint = false;
-  TERN_(HAS_FAN, thermalManager.zero_fan_speeds());
-  thermalManager.disable_all_heaters();
+  thermalManager.cooldown();
   TERN_(LCD_SET_PROGRESS_MANUALLY, ui.set_progress(100 * (PROGRESS_SCALE)));
   TERN_(USE_M73_REMAINING_TIME, ui.set_remaining_time(0));
   Draw_Print_confirm();

Marlin/src/lcd/extui/dgus/DGUSScreenHandler.cpp

       default:
       switch (var.VP) {
         default: return;
-        case VP_E0_BED_PREHEAT: TERN_(HAS_HOTEND, ui.preheat_all(0)); break;
+        case VP_E0_BED_PREHEAT: TERN_(HAS_HOTEND,       ui.preheat_all(0)); break;
         case VP_E1_BED_PREHEAT: TERN_(HAS_MULTI_HOTEND, ui.preheat_all(1)); break;
       }
       case 7: break; // Custom preheat
-      case 9: // Cool down
-        thermalManager.zero_fan_speeds();
-        thermalManager.disable_all_heaters();
-        break;
+      case 9: thermalManager.cooldown(); break; // Cool down
     }
 
     // Go to the preheat screen to show the heating progress

Marlin/src/lcd/extui/ui_api.cpp

 
   void setFeedrate_percent(const_float_t value) { feedrate_percentage = constrain(value, 10, 500); }
 
-  void coolDown() {
-    thermalManager.disable_all_heaters();
-    TERN_(HAS_FAN, thermalManager.zero_fan_speeds());
-  }
+  void coolDown() { thermalManager.cooldown(); }
 
   bool awaitingUserConfirm() {
     return TERN0(HAS_RESUME_CONTINUE, wait_for_user) || getHostKeepaliveIsPaused();

Marlin/src/lcd/menu/menu_temperature.cpp

 #if HAS_TEMP_HOTEND || HAS_HEATED_BED
 
   void lcd_cooldown() {
-    thermalManager.zero_fan_speeds();
-    thermalManager.disable_all_heaters();
+    thermalManager.cooldown();
     ui.return_to_status();
   }
 

Marlin/src/module/temperature.h

      */
     static void disable_all_heaters();
 
+    /**
+     * Cooldown, as from the LCD. Disables all heaters and fans.
+     */
+    static inline void cooldown() {
+      zero_fan_speeds();
+      disable_all_heaters();
+    }
+
     #if ENABLED(PRINTJOB_TIMER_AUTOSTART)
       /**
        * Methods to check if heaters are enabled, indicating an active job