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Forklift thermostat

Reading time 4 min 7 sec

Find a great selection of forklift thermostats at Low Prices, OEM, and aftermarket supply. The Lift parts warehouse team finds all kinds of other ways to save you some money without sacrificing the quality of the product you get in the final result. Buy a new forklift thermostat at low prices with quality guaranteed at our shop with Quick Shipping and Delivery.


The following technical information allows the reader to know more about the thermostat and its functioning within the cooling system of an internal combustion engine. Besides, you will find the selection criteria to acquire the correct replacement for your thermostat and some tips about installing a new thermostat in your forklift cooling system.

Table of content

  1. What is a thermostat?

  2. Components of a thermostat

  3. How a thermostat works

  4. How to choose the correct forklift thermostat

  5. Signs of a thermostat damaged

  6. How to install a new thermostat

What is a thermostat?

The thermostat is a valve that opens or closes depending on the temperature of a fluid. This device is an essential element within the forklift cooling system, and its function is to allow or block the outlet of coolant from the engine body to the radiator.

forklift thermostat
Figure 1. The thermostat of a forklift cooling system

Components of a thermostat

The following parts compound the thermostat:

  1. Main valve (or primary valve).

  2. Seal.

  3. Charge cylinder.

  4. Spring.

  5. By-pass valve (or secondary valve).

Thermostat components
Figure 2. Thermostat components

How a thermostat works

This device is part of an engine cooling system and communicates the engine body outlet with the radiator inlet. When an internal combustion engine is running, heat is generated, and its temperature increases. The cooling system circulates coolant around the engine to avoid overheating.

This device acts as a valve. The thermostat charge cylinder contains wax inside, which is a material with a set melting point. So, heat exchange is produced between the valve and the coolant circulating. As the coolant gets hotter, the wax melts.

foirklift thermostat
Figure 3. Example of another thermostat model

While the coolant is still cold, the wax remains solid, and the by-pass valve is open. It permits that coolant keeps circulation in the engine body. When the fluid temperature rises, the wax begins to melt; Gradually, the by-pass valve closes, and the main valve opens. In this way, the hot fluid passes through a hose towards the radiator.

When the water pump inserts cold coolant to circulate in the engine body, the temperature decreases, and the thermostat valve returns to its initial position ( the by-pass valve opens and the main valve closes).

How to choose the correct forklift thermostat

Be sure that the specifications of the new thermostat match the old one. Some of the more important of these are:

  • The opening temperature measure.

  • The maximum outside diameter (OD).

  • Height ( its total height but also its height for the radiator and engine side).

Signs of a thermostat damaged

If the thermostat is defective, the cooling system will not work well. The most evident problem is engine overheating, which occurs a few minutes after running.

Another sign that something's wrong with your thermostatic valve is the incorrect ( or fluctuating) temperature changes shown by the forklift gauge. The below are the symptoms of thermostat damaged:

  • Coolant is leaking from the thermostat. It happens when the device keeps stuck and cannot open; commonly, the leaking is found in the housing or the mounting surface. If this issue occurs in a recently installed thermostat, the problem could be caused by a faulty installation. But also it can be caused by a defective thermostat gasket.

  • The thermostat is entirely rusted. When the material of the thermostat does not have resistance against the properties of the coolant, the device can get rust. The air can also generate corrosion (which commonly comes from a defective radiator cap). A suitable new thermostat must replace the damaged one to solve the problem. In addition, it is recommended to check the radiator cap.

  • Thermostat clogged. It is caused by a coolant that is contaminated or non-compatible. It generates a sludge accumulation around the main valve and avoids the correct functioning of the device.

How to install a new thermostat

First off, it is recommended to get a new gasket in addition to a new thermostat. The gasket function is to seal the connection between the engine and the radiator hose. In this way, you can avoid a future problem by using the old gasket.

Follow the below steps for the thermostat replacing:

  1. Be sure that the engine is cold.

  2. Locate where your thermostat is. As a reference, remember it is located inside the inlet upper-radiator hose.

  3. Pull off the radiator hose. Before doing this- for a clean working environment- put a recipient to catch the coolant containing the hose.

  4. Remove the thermostat housing.

  5. Remove the old gasket.

  6. Remove the old/damaged thermostat.

  7. Place the new thermostat and gasket.

  8. Install the thermostat housing and the radiator hose again.

Additionally, we suggested refilling the coolant and a correct bleed of the cooling system, refilling of coolant, and replacing radiator hose clamps.


  • It is a valve whose function is to allow or block the coolant outlet from the engine body to the radiator.

  • When the coolant is cold, the by-pass valve makes it recirculate; when the coolant is hot, the wax melts, and the main valve opens to deliver the hot coolant to the radiator.

  • The thermostat valve is chosen by its dimensions and the temperature value that makes the valve open.

  • Coolant leaking and a clogged or corroded thermostat are the most common signs of a damaged device.

  • A correct installation of a new thermostat avoids future inconvenience.

Our team knows how frustrating it can get when you're looking for a specific part and end up getting the wrong one. Let's help you to find a suitable forklift thermostat according to your requirements and specifications.

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