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Looking for a bimetal-adjustable thermostat control for a home/window box type fan.

This is just a cheap bimetallic adjustable fan switch. I need it for a project and want to keep it simple.

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Try your local hardware store. Ask for a replacement for an attic fan thermostat.

Posted on Apr 13, 2015


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I have an HDX Industrial size pedastool fan that turned on and off by itself. Is that possible!??? U have to turn the knob for it to turn back on. How is that possible for it to turn back on HIGH SPEED ,,,...

Hi Crystal,
There are several possibilities. I am not familiar with your fan.

One possibility is "touch" switching. This type of control uses grounding of the device (in millivolts). Sometimes an electrical circuit loaded heavily will trigger these switching controls.

Another is motor overheat. Many motors have thermal overload protection, so when bearings (for example) start to fail and put additional strain on the motor. During this condition, a bimetallic strip opens the circuit and allows the motor to cool, (rather than overheat and become a fire hazard).

Your final comment, however, makes me wonder about the switch itself. If you manually turned the switch to off, and the unit turned on, the switch itself is suspect. If it cannot be opened up and examined, just replace it.


Oct 22, 2014 | Cars & Trucks

2 Answers

I have 1999 VW Beetle 2.0 have change all cooling fan parts all new relays sensors fans control modules and the temperature dash light keeps showing hot what could it be thats going wrong

connection to radiator fan switch could be bad.

If I take out the connector from the fan switch (thermo switch/fan control switch) that light acts just as you described.
So check the fuse box on top of the battery, take out the fuses and make sure nothing is melted. Now check if you are getting power to the switch connector. red wire is hot wire, 2 striped wires can be used as ground. Make use you get around 12 volts, not mV.

if you got no power there then try checking continuity in the wiring... you need power there to make thing work :D

learning from experiencing.

Jul 26, 2012 | 2000 Volkswagen Beetle

1 Answer

Cooling fans will not turn on

a) the fan switch in the bottom of the radiator. These are bimetal devices and sometimes stick when old. Sometimes a jolt will unstick it.

b) check the wiring to the fans. There's a 10W resistor pack on the fan shroud that may have overheated or failed.

c) check that the fans do rotate. Motors burn out, and these will blow the main fan fuse in the junction box.

Sep 28, 2010 | 1993 Eagle Talon

1 Answer

Fans wont turn on. tried 5 relay replacements but did not work. i can start the fans by jumping them with a wire in the relay jacks.(the original and the other five relays were working properly. tried them...

Check the fan switch at the bottom of the radiator. These are a bimetal device and sometime stick with age. The switch turns on the relays. Check that the switch does have +12v power on one side. If not, trace the power problem. It runs back to the main junction box. Connections on the bottom of this box get corroded.

Sep 07, 2010 | 1993 Eagle Talon

2 Answers

Is there some type of sensor that tells the thermostat to open or a sensor to tell the fan to come on if so whats the name of the sensor for 1995 acura legend my car just start doing this after i noticed a...

The thermostat on the radiator opens by heat automatically. The fan switch is run by the Engine temp Sensor and the ECM. If your fan is not running it is most likely a problem with the fan or the Temp sensor, I would look at the fan first.

Jun 23, 2010 | Cars & Trucks

1 Answer

2001 volvo s440 1.9t

Volvo Radiator, Thermostat and Sensors Your cooling system's temperature controls include all coolant temperature sensors, Volvo thermostat, Volvo radiator or expansion tank cap, cooling fan(s) and fan clutch (if equipped). These cooling system parts function primarily independent of the engine but control the engine either through cooling or by sending control signals to your Volvo's electronic systems.
The Volvo thermostat is a spring-loaded valve that opens and closes based on the temperature of the coolant flowing through it. A high temperature reading followed by a drop to normal temperature (or a continuously low temperature) is a common first sign of a sticking Volvo thermostat. However, many other conditions may cause these symptoms, so you need to know how to eliminate each possibility.
The Volvo radiator or expansion tank cap is also a spring-loaded valve reacting to system pressure. It serves to maintain proper system coolant level at predetermined pressures. It must always be replaced with an exact replacement cap with the same pressure setting. Never use other caps except for short-term emergencies!
A belt-driven fan blade for pulling air through the Volvo radiator is usually on the Volvo water pump pulley and should have a fan clutch to control it. The fan clutch allows the fan to turn with the belt at low engine speed and "free-wheel" at higher speeds. A bad fan clutch either doesn't allow the fan to spin at low speed (overheating in traffic) or doesn't allow it to free-wheel at high speed (potential overheating on highway or reduced gas mileage).
An electric fan can be either by itself (usually front-wheel drive) or auxiliary (used with a mechanical fan). Both types are controlled via a temperature sensor - in the Volvo radiator or upper Volvo radiator hose or on the Volvo thermostat or Volvo water pump housing. This sensor is usually an on/off type switch with a fixed temperature setting. (Some vehicles may have 2-3 settings for multi-speed fans.) This sensor is commonly called an "auxilliary fan switch".
Other common temperature sensors are: 1) gauge sender (variable output); 2) warning light sender (on/off type); 3) lambda and/or fuel injection sensor(s) (variable to control fuel injection settings); 4) thermo-time switch (cold start valve control). Your Volvo may have other sensors as well.
Temperature control is critical to both performance and emission control. Unfortunately, this system is the most difficult to troubleshoot without proper equipment and diagrams. It's even more difficult with computers that adjust timing, idle speed, vacuum and fuel delivery automatically to make up for potentially faulty temperature sensor signals.
Maintenance of your cooling system sensors is virtually impossible since there's nothing really to "maintain". Keeping them clean both internally (coolant replacement) and externally (engine cleaning) is the best way to ensure trouble-free driving. Checking and replacing all parts at the factory-recommended time or mileage limits helps as well

Jul 23, 2009 | 2001 Volvo S40

2 Answers

Temperature guage running colder than normal

This is the Thermostat Causing this and Yes you are Correct on the Location of it. Please Rate My Response! Thanks!

Feb 06, 2009 | 2000 Chrysler Town & Country

1 Answer

Cooling fan relay control ciruit

Are you sure it isn't only a failed thermoswitch?
There isn't normally much of a circuit; the fan motor is directly or indirectly controlled by a bimetal switch that is screwed into the lower radiator tank. That switch could control a relay but it isn't common to do it that way, it would be better since that kind of switch doesn't handle fairly heavy currents as the fans need so a relay would relieve it from carrying no more than a couple hundred milliamperes at the most.  

Jan 14, 2009 | 2002 Dodge Ram Maxi

2 Answers

Blower is working on position 4 (max) only

The fan speed control resistor is burned out.

Nov 23, 2008 | 2000 Nissan Quest

1 Answer

Car is overheating

2 Inspect Belt Incorrectly routed, adjusted, tensioned, missing, or worn water pump belt(s). grey_line.gif 3 Inspect Oil Pan Gasket - Performance Ruptured, cracked or leaking radiator hose. grey_line.gif 4 Inspect Radiator Cap Worn or damaged radiator cap grey_line.gif 5 Inspect Thermostat Thermostat stuck closed grey_line.gif 6 Inspect Fan Blade Broken, missing, or defective fan blade(s). grey_line.gif 8 Inspect Water Pump Damaged, worn or leaking water pump. grey_line.gif 9 Inspect Intake Manifold Plenum - Perform Leaking water pump gasket. grey_line.gif 10 Inspect Cooling Fan Control Faulty cooling fan control or circuit. grey_line.gif 11 Inspect Cooling Fan Switch - Radiator Faulty radiator cooling fan switch or circuit. grey_line.gif 12 Inspect Engine Temperature Sensor Faulty engine temperature sensor or circuit. grey_line.gif 13 Inspect Temperature Switch Damaged or faulty temperature switch or temperature switch circuit. grey_line.gif 14 Inspect Fan Clutch Worn, loose or faulty fan clutch. grey_line.gif 15 Inspect Ported Vacuum Switch Damaged, leaking, or faulty ported vacuum switch. grey_line.gif 16 Inspect Radiator Obstructed radiator core or radiator cooling fins. grey_line.gif 17 Inspect Head Gasket - Performance Head gasket leaking coolant into cylinders here is a list of things to check Shaun

Nov 17, 2008 | 2000 Cadillac DeVille

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