INSTALLATION INSTRUCTIONS
IN-LINE FAN THERMOSTAT SWITCH
PART # 13021 & 15721
WIRING
1. The temperature switch has two male terminals, attach one (it doesn't matter which) to a switched ignition 12 volt source.
The other attaches to the positive lead on fan motor.
(See Diagram #1 & 2)
2. Connect other fan motor lead to a good chassis ground.
Please read these instructions completely before beginning installation
13021-15721-InstructionSheet
Derale Performance, Los Angeles, CA 800.421.6288 www.derale.com
Warning: Installation of accessories should only be undertaken by those with mechanical knowledge and are familiar with working on
vehicles. Always use eye protection (goggles, safety glasses or shield). Park the vehicle in a well lit area, on level ground and apply the
parking brake. Only work on a cold vehicle that has been sitting overnight, failure to do so will result in severe burns and injury. Before starting
the vehicle, make sure no tools or any other items are left under hood that could interfere with or be drawn into moving parts of the engine.
Failure to follow instructions can lead to severe damage and personal injury.
Diagram #1
Diagram #3
KIT CONTENTS
QTY. DESCRIPTION
1 Thermostat Switch
1 Adapter Fitting
1 AN Male x Hose Barb Fitting
1 AN Female x Hose Barb Fitting
IMPORTANT
The in-line thermostat switch is designed to thermostatically
control the electric fan on a remote mounted transmission or
engine oil cooler. If using the switch on a non-Derale electric fan,
check the amperage draw of the fan. If the fan draws over 10
amps a relay should be used.
ON-INLET INSTALLATION
The best way to mount the switch is directly on the inlet of the cooler core. The switch has AN threads that fits on most Derale oil
cooler cores. If the cooler you are using does not have AN Inlets, see the in-line installation below. (See Diagram #3)
1. Install aluminum in-line thermostat fitting on inlet port of cooler core. Warning: Always use two wrenches, one to tighten
the adapter and one to hold on the cooler inlet. Failure to do this could damage the cooler core. No thread sealant is
required on fittings.
2. Install temperature sensor onto adapter fitting. Use a dab of silicone sealer on threads. The sensor is brass and will break
if over-tightened.
IN-LINE INSTALLATION
If the cooler core you are using does not have AN inlets use the
hose barb adapters included in the kit.
(See Diagram #3)
1. Install hose barb adapters onto in-line adapter. No thread
sealant is required on AN fittings.
2. Install temperature sensor onto in-line adapter. Use a dab of
silicone sealer on threads. The sensor is brass and will
break if over-tightened.
3. Install rubber hoses onto hose barb adapters and use good
quality clamps to hold hose.
Outlet
Diagram #2
Ground
Ignition
Switched
12V (+)
Temp Sensor
Inlet
Adapter
Fitting
Thermostat Switch
Adapter Fitting
AN Female
Port
AN Male
Port
(1 pages)
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