do not press the back button…
Enter your VAT number here and click Verify:
Your details have been verified. VAT number registered to:
,
.
Your order will now be zero rated for VAT purposes. We reserve the right to verify these details after your order request has been made and reinstate VAT if required.
Your VAT details were not recognised or were invalid. Your VAT number must be matched to your Billing Country as specified above. This is currently specified as . You do not need to enter the country code part of your VAT number as this has already been selected in your billing address details above.
The VAT number checking service is currently offline. Please supply your VAT details within the comments or special instructions field below and we will apply a VAT discount after placing your order request.
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 996 GT3 MKI 1999-02
- Porsche 996 GT3 MKII 2003>>
- Porsche 996 GT3 RS 2003-04
The Genuine Porsche 99661610100 is the factory-spec series resistor used to control the speed of the auxiliary radiator (cooling) fan on select Porsche 986 Boxster and 996 Carrera / 996-series models.
Fits:
Porsche 986 Boxster 1997 - 2004
Porsche 996 C2 / C4 / C4S 1998 - 2005
Porsche 996 GT3 / GT3 RS 1999 - 2005
Diagram Ref No 4.
This resistor modulates the electrical current to the cooling fan, allowing the fan to run at different speeds (low and high) depending on engine and coolant temperature demands. By enabling variable fan speed instead of only full-speed operation, it helps regulate engine temperature more precisely, reduces noise when full cooling isn’t required, and ensures efficient radiator airflow under load or idle conditions.
Replace the resistor when:
• The cooling fan only works at high speed or fails to run at low speed (indicating resistor failure).
• Fan runs intermittently or erratically, or coolant temperatures climb under idle/traffic conditions.
• Heat-related failures (resistor overheated, wiring insulation damaged) or exposure to moisture/age has degraded the resistor.
• Cooling system overhaul: radiator or fan motor replacement, or when restoring an older 986/996 to maintain OEM reliability.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99661610100
The product you are viewing cross references to these numbers
- Porsche 918 Spyder 4.6L 2014-15
Fits:
Porsche 918 Spyder 2015
NOTE: Three units are allocated to the engine oil cooler, six units in total are used for the front radiators (three on each side), and six units are designated for the rear radiator fan console.
- Porsche 991.1 Turbo 3.8L (520 Bhp) 2014-16
- Porsche 991.1 Turbo S 3.8L (560 Bhp) 2014-16
- Porsche 991.1 R 4.0L (500 Bhp) 2016
- Porsche 991.1 GT3 3.8L (475 Bhp) 2014-16
- Porsche 991.1 GT3 RS 4.0L (500 Bhp) 2015-16
- Porsche 991.2 Turbo Coupe 3.8L (540 Bhp) 2016-19
- Porsche 991.2 Turbo S Coupe 3.8L (580 Bhp) 2016-19
- Porsche 991.2 Turbo Cabriolet 3.8L (540 Bhp) 2016-19
- Porsche 991.2 Turbo S Cabriolet 3.8L (580 Bhp) 2016-19
- Porsche 991.2 Speedster 4.0L (510Bhp) 2019
- Porsche 991.2 GT3 4.0L (500 Bhp) / GT3 RS 4.0L (520 Bhp) 2017-19
- Porsche 991.2 GT2 RS 3.8L PDK (700 bhp) 2018-19
- Porsche 918 Spyder 4.6L 2014-15
Sold individually; x6 required per vehicle.
Fits:
Porsche 991 Turbo / S 2014-20 - Excludes GT2 RS
Porsche 991 GT3 / RS 2014-21
Porsche 918 Spyder 2015*
Diagram ref. 12.
*NOTE: For the 918 Spyder, an additional 6 spacers are required for the two rear radiator fans.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99162417701
The product you are viewing cross references to these numbers