diff --git a/src/mainboard/google/beltino/acpi/thermal.asl b/src/mainboard/google/beltino/acpi/thermal.asl
index 40564c3ad7..7e9d413c59 100644
--- a/src/mainboard/google/beltino/acpi/thermal.asl
+++ b/src/mainboard/google/beltino/acpi/thermal.asl
@@ -141,11 +141,7 @@ Scope (\_TZ)
 		}
 
 		Method (_AC4) {
-			If (\FLVL <= 4) {
-				Return (CTOK (FAN4_THRESHOLD_OFF))
-			} Else {
-				Return (CTOK (FAN4_THRESHOLD_ON))
-			}
+			Return (CTOK (0))
 		}
 
 		Name (_AL0, Package () { FAN0 })
diff --git a/src/mainboard/google/beltino/variants/mccloud/include/variant/thermal.h b/src/mainboard/google/beltino/variants/mccloud/include/variant/thermal.h
index f4c0474329..4a84032609 100644
--- a/src/mainboard/google/beltino/variants/mccloud/include/variant/thermal.h
+++ b/src/mainboard/google/beltino/variants/mccloud/include/variant/thermal.h
@@ -3,29 +3,27 @@
 #ifndef THERMAL_H
 #define THERMAL_H
 
-/* Fan is OFF */
-#define FAN4_THRESHOLD_OFF	0
-#define FAN4_THRESHOLD_ON	0
+/* Fan is OFF at idle (passive cooling) */
 #define FAN4_PWM		0x00
 
 /* Fan is at LOW speed */
-#define FAN3_THRESHOLD_OFF	35
-#define FAN3_THRESHOLD_ON	40
-#define FAN3_PWM		0x88
+#define FAN3_THRESHOLD_OFF	40
+#define FAN3_THRESHOLD_ON	50
+#define FAN3_PWM		0x68
 
 /* Fan is at MEDIUM speed */
-#define FAN2_THRESHOLD_OFF	44
-#define FAN2_THRESHOLD_ON	48
-#define FAN2_PWM		0x94
+#define FAN2_THRESHOLD_OFF	55
+#define FAN2_THRESHOLD_ON	67
+#define FAN2_PWM		0x84
 
 /* Fan is at HIGH speed */
-#define FAN1_THRESHOLD_OFF	53
-#define FAN1_THRESHOLD_ON	58
-#define FAN1_PWM		0xb5
+#define FAN1_THRESHOLD_OFF	67
+#define FAN1_THRESHOLD_ON	75
+#define FAN1_PWM		0xa5
 
 /* Fan is at FULL speed */
-#define FAN0_THRESHOLD_OFF	65
-#define FAN0_THRESHOLD_ON	70
+#define FAN0_THRESHOLD_OFF	85
+#define FAN0_THRESHOLD_ON	90
 #define FAN0_PWM		0xc4
 
 /* Temperature which OS will shutdown at */
diff --git a/src/mainboard/google/beltino/variants/monroe/include/variant/thermal.h b/src/mainboard/google/beltino/variants/monroe/include/variant/thermal.h
index c2a2ef09b8..0074f0dd91 100644
--- a/src/mainboard/google/beltino/variants/monroe/include/variant/thermal.h
+++ b/src/mainboard/google/beltino/variants/monroe/include/variant/thermal.h
@@ -3,30 +3,28 @@
 #ifndef THERMAL_H
 #define THERMAL_H
 
-/* Fan is OFF */
-#define FAN4_THRESHOLD_OFF	0
-#define FAN4_THRESHOLD_ON	0
+/* Fan is OFF at idle (passive cooling) */
 #define FAN4_PWM		0x00
 
 /* Fan is at LOW speed */
-#define FAN3_THRESHOLD_OFF	45
-#define FAN3_THRESHOLD_ON	58
-#define FAN3_PWM		0x40
+#define FAN3_THRESHOLD_OFF	40
+#define FAN3_THRESHOLD_ON	50
+#define FAN3_PWM		0x68
 
 /* Fan is at MEDIUM speed */
-#define FAN2_THRESHOLD_OFF	52
-#define FAN2_THRESHOLD_ON	64
-#define FAN2_PWM		0x80
+#define FAN2_THRESHOLD_OFF	55
+#define FAN2_THRESHOLD_ON	67
+#define FAN2_PWM		0x84
 
 /* Fan is at HIGH speed */
-#define FAN1_THRESHOLD_OFF	59
-#define FAN1_THRESHOLD_ON	68
-#define FAN1_PWM		0xb3
+#define FAN1_THRESHOLD_OFF	67
+#define FAN1_THRESHOLD_ON	75
+#define FAN1_PWM		0xa3
 
 /* Fan is at FULL speed */
-#define FAN0_THRESHOLD_OFF	66
-#define FAN0_THRESHOLD_ON	79
-#define FAN0_PWM		0xff
+#define FAN0_THRESHOLD_OFF	85
+#define FAN0_THRESHOLD_ON	90
+#define FAN0_PWM		0xc4
 
 /* Temperature which OS will shutdown at */
 #define CRITICAL_TEMPERATURE	98
diff --git a/src/mainboard/google/beltino/variants/panther/include/variant/thermal.h b/src/mainboard/google/beltino/variants/panther/include/variant/thermal.h
index 27c6c33756..07f7c9f075 100644
--- a/src/mainboard/google/beltino/variants/panther/include/variant/thermal.h
+++ b/src/mainboard/google/beltino/variants/panther/include/variant/thermal.h
@@ -3,9 +3,7 @@
 #ifndef THERMAL_H
 #define THERMAL_H
 
-/* Fan is OFF */
-#define FAN4_THRESHOLD_OFF	0
-#define FAN4_THRESHOLD_ON	0
+/* Fan is OFF at idle (passive cooling) */
 #define FAN4_PWM		0x00
 
 /* Fan is at LOW speed */
@@ -14,22 +12,22 @@
 #define FAN3_PWM		0x6b
 
 /* Fan is at MEDIUM speed */
-#define FAN2_THRESHOLD_OFF	75
-#define FAN2_THRESHOLD_ON	83
-#define FAN2_PWM		0xcc
+#define FAN2_THRESHOLD_OFF	55
+#define FAN2_THRESHOLD_ON	67
+#define FAN2_PWM		0x86
 
 /* Fan is at HIGH speed */
-#define FAN1_THRESHOLD_OFF	86
-#define FAN1_THRESHOLD_ON	90
-#define FAN1_PWM		0xe5
+#define FAN1_THRESHOLD_OFF	67
+#define FAN1_THRESHOLD_ON	75
+#define FAN1_PWM		0xa8
 
 /* Fan is at FULL speed */
-#define FAN0_THRESHOLD_OFF	93
-#define FAN0_THRESHOLD_ON	96
-#define FAN0_PWM		0xff
+#define FAN0_THRESHOLD_OFF	85
+#define FAN0_THRESHOLD_ON	90
+#define FAN0_PWM		0xdc
 
 /* Temperature which OS will shutdown at */
-#define CRITICAL_TEMPERATURE	100
+#define CRITICAL_TEMPERATURE	98
 
 /* Temperature which OS will throttle CPU */
 #define PASSIVE_TEMPERATURE	90
diff --git a/src/mainboard/google/beltino/variants/tricky/include/variant/thermal.h b/src/mainboard/google/beltino/variants/tricky/include/variant/thermal.h
index 68db6b89e6..791f2dd279 100644
--- a/src/mainboard/google/beltino/variants/tricky/include/variant/thermal.h
+++ b/src/mainboard/google/beltino/variants/tricky/include/variant/thermal.h
@@ -3,9 +3,7 @@
 #ifndef THERMAL_H
 #define THERMAL_H
 
-/* Fan is OFF */
-#define FAN4_THRESHOLD_OFF	0
-#define FAN4_THRESHOLD_ON	0
+/* Fan is OFF at idle (passive cooling) */
 #define FAN4_PWM		0x00
 
 /* Fan is at LOW speed */
diff --git a/src/mainboard/google/beltino/variants/zako/include/variant/thermal.h b/src/mainboard/google/beltino/variants/zako/include/variant/thermal.h
index 5006b64983..7a1cbc77ec 100644
--- a/src/mainboard/google/beltino/variants/zako/include/variant/thermal.h
+++ b/src/mainboard/google/beltino/variants/zako/include/variant/thermal.h
@@ -3,30 +3,28 @@
 #ifndef THERMAL_H
 #define THERMAL_H
 
-/* Fan is OFF */
-#define FAN4_THRESHOLD_OFF	0
-#define FAN4_THRESHOLD_ON	0
-#define FAN4_PWM		0x4c
+/* Fan is OFF at idle (passive cooling) */
+#define FAN4_PWM		0x00
 
 /* Fan is at LOW speed */
-#define FAN3_THRESHOLD_OFF	48
-#define FAN3_THRESHOLD_ON	52
+#define FAN3_THRESHOLD_OFF	40
+#define FAN3_THRESHOLD_ON	50
 #define FAN3_PWM		0x6d
 
 /* Fan is at MEDIUM speed */
-#define FAN2_THRESHOLD_OFF	50
-#define FAN2_THRESHOLD_ON	55
+#define FAN2_THRESHOLD_OFF	55
+#define FAN2_THRESHOLD_ON	67
 #define FAN2_PWM		0x7c
 
 /* Fan is at HIGH speed */
-#define FAN1_THRESHOLD_OFF	52
-#define FAN1_THRESHOLD_ON	58
+#define FAN1_THRESHOLD_OFF	67
+#define FAN1_THRESHOLD_ON	75
 #define FAN1_PWM		0xa3
 
 /* Fan is at FULL speed */
-#define FAN0_THRESHOLD_OFF	55
-#define FAN0_THRESHOLD_ON	60
-#define FAN0_PWM		0xba
+#define FAN0_THRESHOLD_OFF	85
+#define FAN0_THRESHOLD_ON	90
+#define FAN0_PWM		0xdc
 
 /* Temperature which OS will shutdown at */
 #define CRITICAL_TEMPERATURE	98