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15.12.2015

Product Portrait

Thermostats for trucks and buses

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Guaranteed quality has made the brand DT® Spare Parts the leading brand in the international Independent Aftermarket for commercial vehicles. The complete range includes all required spare parts for trucks, trailers and buses, including all standard thermostats.

The DT® brand products, made of high quality materials, meet your highest quality requirements and guarantee a long period of use.

Thermostats regulate the temperature of the coolant in the cooling system of the vehicle engine under all conditions. This is of particular importance for the durability of the engine, the fuel consumption of the vehicle and the exhaust gas development.

DT-Technic Info

A thermostat, the wax pellet of which registers the temperature of the coolant flowing around it, provides for the allocation of coolant flow, either through the coolant cooler or past it via a short-circuit line.

This means that at very low coolant temperatures, cooling is largely avoided and at high temperatures maximum cooling is provided.

In the closed position, a by-pass valve enables the required minimum flow rate of coolant, to prevent damaging over-pressure in the engine.

High flow rates are achieved by double-thermostats, which have two different opening temperatures in order to ensure a uniform engine temperature.

To ensure resistance to the corrosive substances in the coolant, individual components affected are made of corrosion-resistant materials, such as stainless steel or brass.

Some thermostats have ventilation holes with a valve, which simplifies bleeding of the cooling circuit when replacing components.

 Construction of thermostats

  1. Stainless steel housing
  2. Poppet valve
  3. Poppet valve spring
  4. Bypass valve
  5. Bypass valve spring
  6. Expansion element (Wax pellet)
  7. Bleeder valve
  8. Temperature marking
  9. Manufacturing date
  10. Manufacturer‘s marking


Thermostats of the brand DT® Spare Parts are supplied with the appropriate gaskets, O-rings or seal rings in order to facilitate assembly.

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