18748-InstructionSheet
Derale Performance, Los Angeles, CA 800.421.6288 www.derale.com
INSTALLATION INSTRUCTIONS
SINGLE STAGE ELECTRIC FAN THERMOSTAT
PART # 18748
THERMOSTAT PROBE INSTALLATION
Push-in Radiator Probe (See Diagram #1)
For best results we recommend installing the probe as close
as possible to the water inlet of the radiator. (See Diagram #1)
1. Take the brass probe and thread it clockwise onto the thermostat.
2. Carefully insert the probe/thermostat assembly into the fins of the
radiator until thermostat is flush with radiator.
3. Install the 1 x 1 foam pad onto the Push-in Probe.
4. Install Retaining Clip onto the Push-in Probe until tight. (See Diagram #1)
Placement:
Installation:
IMPORTANT
This single stage electric fan thermostat will
control one electric fan with a MAXIMUM DRAW
OF 15 CONTINUOUS AMPS.
Please read these instructions completely before beginning installation
TROUBLE SHOOTING Q&A
Q: Why doesn’t the fan turn on automatically?
A: 1. Check all connectors to make sure contacts are crimped correctly.
2. Check the Ground connection to make sure all paint is sanded off and you are getting a metal to metal contact.
3. Check the 20 Amp Fuse Holder to make sure the fuse is good and is securely in place.
Q: Why does the electric fan run after the engine is turned off?
A: Check the ignition wire to make sure this is connected to a switched ignition source and not a constant power source.
Diagram #2
Ground
Fan Motor
20Amp Fuse
(Not Supplied)
12 Volt (+)
Ignition
Switch
Thermostat
WIRING
(See Diagram #2)
Before starting, disconnect the Negative (-) cable on the
vehicles battery.
1. Attach the Negative (-) wire on the electric fan to a good
chassis ground (-).
2. Attach the Positive (+) wire on the electric fan to EITHER
terminal on the Thermostat Switch.
3. Attach the remaining terminal on the Thermostat Switch to
either wire on the 20 Amp Fuse Holder. (Not Supplied)
4. Attach the remaining wire on the 20 Amp Fuse Holder to a
good Positive (+) switched ignition source.
If this wire is connected to a constant power source
(battery) the electric fan will run after the vehicle has
been shut off and could run down the battery.
Reattach the Negative (-) cable on the vehicles battery.
Note:
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.
KIT CONTENTS
QTY. DESCRIPTION
1 Thermostat Switch
1 Push-in Probe
QTY. DESCRIPTION
1 1 x 1 Foam Pad
1 Retaining Clip
TOOLS NEEDED
12V Test Light
Wire Stripper
Crimping Tool
Radiator
Foam Pad
Retaining
Clip
Push-in
Probe
Diagram #1
Thermostat
Switch
(2 pages)
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