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Message: 987 is different
Changed By: Boxsterra
Change Date: February 18, 2023 09:44PM
987 is different
Change Date: February 18, 2023 09:44PM
987 is different
The fan control system on the 987 is completely different than on the 987 986 so my hack won't work. Also, the hack is to fix non-working high fan speed so it wouldn't apply in your case anyway.
The 987 fans aren't 2-speed (low and high) like on the 986 but instead are infinitely variable. They are supposed to turn on when the coolant temp is over 206° F and increase in speed until they are at their highest at 215° F.
On the 986 the fan low speed is controlled by ballast resistors and 4 relays (low/high, left/right).
On the 987 the fans are controlled by the front end control unit located at the right side of the front trunk (left side if you're facing the back of the car) under the carpet.
On the 987 the high amperage switching is controlled by a "cooling water blower control unit", located at the front right radiator. This is the replacement for the relays found on the 986.
If your coolant is above 206° F and neither of the fans is going on (make sure to double check by holding your hand under each radiator) but they are working at higher speed then I would suspect a problem with the coolant temperature sensor or the wiring from the temp sensor to the control unit. The easiest way to test the coolant temperature sensor is to connect an OBD-2 reader and read the temperature from there.
The 987 fans aren't 2-speed (low and high) like on the 986 but instead are infinitely variable. They are supposed to turn on when the coolant temp is over 206° F and increase in speed until they are at their highest at 215° F.
On the 986 the fan low speed is controlled by ballast resistors and 4 relays (low/high, left/right).
On the 987 the fans are controlled by the front end control unit located at the right side of the front trunk (left side if you're facing the back of the car) under the carpet.
On the 987 the high amperage switching is controlled by a "cooling water blower control unit", located at the front right radiator. This is the replacement for the relays found on the 986.
If your coolant is above 206° F and neither of the fans is going on (make sure to double check by holding your hand under each radiator) but they are working at higher speed then I would suspect a problem with the coolant temperature sensor or the wiring from the temp sensor to the control unit. The easiest way to test the coolant temperature sensor is to connect an OBD-2 reader and read the temperature from there.
Original Message
Author: BoxsterraDate: February 17, 2023 04:09PM
987 is different
The fan control system on the 987 is completely different than on the 987 so my hack won't work. Also, the hack is to fix non-working high fan speed so it wouldn't apply in your case anyway.
The 987 fans aren't 2-speed (low and high) like on the 986 but instead are infinitely variable. They are supposed to turn on when the coolant temp is over 206° F and increase in speed until they are at their highest at 215° F.
On the 986 the fan low speed is controlled by ballast resistors and 4 relays (low/high, left/right).
On the 987 the fans are controlled by the front end control unit located at the right side of the front trunk (left side if you're facing the back of the car) under the carpet.
On the 987 the high amperage switching is controlled by a "cooling water blower control unit", located at the front right radiator. This is the replacement for the relays found on the 986.
If your coolant is above 206° F and neither of the fans is going on (make sure to double check by holding your hand under each radiator) but they are working at higher speed then I would suspect a problem with the coolant temperature sensor or the wiring from the temp sensor to the control unit. The easiest way to test the coolant temperature sensor is to connect an OBD-2 reader and read the temperature from there.
The 987 fans aren't 2-speed (low and high) like on the 986 but instead are infinitely variable. They are supposed to turn on when the coolant temp is over 206° F and increase in speed until they are at their highest at 215° F.
On the 986 the fan low speed is controlled by ballast resistors and 4 relays (low/high, left/right).
On the 987 the fans are controlled by the front end control unit located at the right side of the front trunk (left side if you're facing the back of the car) under the carpet.
On the 987 the high amperage switching is controlled by a "cooling water blower control unit", located at the front right radiator. This is the replacement for the relays found on the 986.
If your coolant is above 206° F and neither of the fans is going on (make sure to double check by holding your hand under each radiator) but they are working at higher speed then I would suspect a problem with the coolant temperature sensor or the wiring from the temp sensor to the control unit. The easiest way to test the coolant temperature sensor is to connect an OBD-2 reader and read the temperature from there.