Automotive cooling component, the OTOTEC Fan Temperature Control Thermal Switch, controls radiator fan operation to help keep engine temperature steady. Owners of classic Porsche 924, 928 and 944 gain reassurance from a direct-fit replacement that avoids rewiring. Is this the straightforward fan thermostat needed for reliable cooling?
⚡ At a Glance
- • Activation behaviour: Temperature-sensing activation for the radiator fan to maintain cooling efficiency
- • Best for: Owners of Porsche 924, 928 and 944 seeking a direct-fit replacement
- • Not ideal for: Vehicles with non-matching thread sizes or different wiring configurations
Temperature-sensing switch designed for classic Porsche cooling systems. Direct-fit 2-pin replacement intended for radiator mounting and straightforward installation.
Direct-fit replacement – with 2-pin design and OEM part compatibility
Two-pin electrical layout matches original wiring so the existing fan harness normally remains unchanged. Listed OEM numbers include 94460648100, 823959481F, 94460948100 and 823959481 for straightforward identification.
A straightforward swap reduces labour and avoids cutting or reterminating wires. Useful when maintaining factory wiring integrity is a priority.
Consistent temperature control – thanks to calibrated 92°C start and 87°C stop temperatures
Thermostatic switching closes at 92°C to start the fan and opens at 87°C to stop it, providing a narrow hysteresis band. The calibration is designed to respond to coolant temperature changes rather than external airflow.
Stable switching helps prevent frequent fan cycling and supports steady engine running temperatures. Particularly helpful under load or in slow traffic where coolant temperature rises.
Robust mounting and sealing – with M22 metal threaded shell
Metal threaded construction uses a standard M22 thread and overall dimensions of 29 x 43.5 mm, built for high-temperature automotive environments. Designed for installation on the radiator to sense coolant temperature directly.
Secure thread and metal shell reduce the risk of leaks and loosening from vibration. Suited to older cars where heat resistance and sealing matter.
✨ The 4 Key Reasons for OTOTEC Fan Temperature Control Thermal Switch
- Simple 2-pin fit – Direct wiring replacement that avoids rewiring the original fan harness
- OEM part compatibility – Matches multiple Porsche OEM numbers for straightforward sourcing
- M22 metal threaded shell – Provides robust sealing and heat resistance under engine conditions
- Automated radiator control – Senses coolant temperature to run fan only when needed
📋 Technical Details at a Glance
- Category: Automotive fan temperature control switch
- Compatibility: Porsche 924 (1975-1989), Porsche 928 (1977-1986), Porsche 944 (1981-1990)
- OEM Reference Numbers: 94460648100, 823959481F, 94460948100, 823959481
- Activation Temperature: Calibrated start point (see technical info)
- Deactivation Temperature: Calibrated stop point (see technical info)
❓ Frequently Asked Questions
Q: Will this fit my Porsche 944?
A: Compatibility is listed for Porsche 944 models from 1981 to 1990, but confirm the M22 thread and overall accessory fit before purchasing.
Q: What temperatures does it switch at?
A: The thermostat is calibrated to start the fan at 92°C and turn it off when the temperature drops to 87°C.
Q: Is installation complicated?
A: A two-pin design allows direct replacement without changing the original wiring, and the usual installation position is on the radiator; confirm thread size and accessories match before fitting.
🏆 Our Verdict
Suitable for owners and mechanics working on Porsche 924, 928 and 944 who need a direct-fit fan thermostat replacement. OEM compatibility, a two-pin layout and metal M22 threading combine for straightforward fitting and reliable cooling control. While costs vary, the ease of installation and robust construction should deliver long-term value by reducing repeat repairs.
