• Stoney Racing Universal Thermal Radiator Fan Switch & Adapter Kit
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Stoney Racing

Stoney Racing Universal Thermal Radiator Fan Switch & Adapter Kit

Stoney Racing Universal Thermal Radiator Fan Switch & Adapter Kit

£29.99 GBP
£29.99 GBP
Sale Sold out

Pre-order: 32mm, 38mm are made to order. Please allow 3–5 weeks for dispatch.

Taxes included. Shipping calculated at checkout.
Adapter O.D.
Switch Temperature

Before fitting: some coolants can damage silicone hoses, and damage caused by the wrong coolant isn't covered by the warranty. Read the Important Fitting Notes (PDF)

Stoney Racing SRU-TFSK Universal Thermal Radiator Fan Switch & Adapter Kit

The Stoney Racing SRU-TFSK is a complete kit for thermally controlling an aftermarket electric radiator fan. It contains an M14 thermal switch, an aluminium hose adapter and a pair of stainless clamps.

Choose from 8 adapter sizes for 26mm to 40mm hoses and 6 switch temperatures from 80°C to 105°C.

Key Features

  • Thermal switch, hose adapter and clamps in one kit
  • Adapters for hose IDs from 26mm to 40mm
  • 6 switch-on temperatures from 80°C to 105°C
  • Unperforated, rolled-edge stainless clamps, safe on silicone hoses
  • Ideal with our 8" to 16" slimline fans

Specifications

Specification Details
Brand Stoney Racing
Product Code SRU-TFSK
Adapter Sizes 26, 28, 30, 32, 34, 36, 38 or 40mm OD
Switch Thread M14x1.5
Switch-On Temperatures 80, 85, 90, 95, 100 or 105°C
Switch Max Current 1 amp (relay control only)
Adapter Material Aluminium
Clamps Pair of stainless steel

Choosing the Adapter Size

Measure the inside diameter of your top radiator hose and choose the matching adapter. Each adapter also fits hoses 1mm smaller, so a 30mm adapter suits 29–30mm hoses. If the hose is wider at one end, measure the section you will cut.

To fit, cut the hose on a straight section, remove about 30mm, and rejoin the two halves with the adapter and the clamps supplied.

Choosing the Switch Temperature

Pick a switch that turns on about 10–15°C above the temperature your thermostat starts to open. For example, a 74°C thermostat suits the 85°C switch, and an 82°C thermostat suits the 95°C switch. Colder is not always better, as the engine needs to reach its normal operating temperature.

Switches On (±3°C) Fahrenheit Switches Off
80°C 176°F 5–8°C lower
85°C 185°F 5–8°C lower
90°C 194°F 5–8°C lower
95°C 203°F 5–8°C lower
100°C 212°F 8–10°C lower
105°C 221°F 8–10°C lower

Important Fitting Information

  • The switch is rated at 1 amp maximum. It must switch the low-current side of a relay (pins 85/86), never the fan directly. Failure from overloading is not covered by the warranty.
  • Run the fan from the battery through a relay and inline fuse.

What's in the Box?

  • 1 × M14x1.5 thermal fan switch
  • 1 × aluminium radiator hose adapter
  • 2 × stainless steel hose clamps

Frequently Asked Questions

Can I wire the fan straight through the switch?

No. The switch is only rated at 1 amp, so it must trigger a relay.

Which hose should it go in?

The top radiator hose, on the hot side before the radiator core.

Can I buy the parts separately?

Yes. The switch and hose adapter are also sold on their own.

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