Falsely accused: the new part
If insufficient heating and cooling capacity is experienced after replacing a coolant thermostat, suspicion frequently falls on the new thermostat—often wrongly so, since the defect may also have arisen during the repair itself! When replacing the thermostat, the cooling circuit of the engine needs to be opened, causing cooling water to escape and air to enter the system (see Figure 1). If these increasingly complex systems are not completely ventilated after the repair, entrapped air remains in the circuit. This not only results in inadequate cooling water circulation and thus poor heating and cooling performance, but can even ultimately lead to serious engine damage. This is because the trapped air can potentially cause local overheating.
Reliable assistant: the vacuum-venting device
By means of a standard workshop compressed air connection, a vacuum-venting device (see Figure 2) creates a vacuum in the cooling system (see Figure 3). The air is thereby completely evacuated from the circuit and new coolant is sucked in free of bubbles by the vacuum. This ensures that all isolated air traps are removed from the cooling circuit.
You will find more helpful information about the assembly of thermostats and our product range here:
Should you use your air conditioning system in winter?
Definitely! It might seem a strange thing to do at first, but it makes sense. Why? Here are four super-cool reasons:
Air conditioning systems don’t just cool, they also dry. The moisture contained in the air condenses on the surface of the evaporator, thus preventing fogged-up windshields—important for road safety.
With the majority of air conditioning systems, you don’t need to worry about the windows icing up. Temperature sensors measure the outside temperature and prevent the air conditioning system from running under 4°C and the condensation water from freezing.
Turning the compressor on ensures that all parts in the air conditioning circuit are lubricated with oil. The gaskets and hoses remain flexible.
For the system to work reliably, it is important not only to service the A/C regularly, but also to change the cabin air filter annually. This prevents contaminants, such as mold, from forming on the evaporator.
Whether it’s winter or summer
Turn off your air conditioning system five to ten minutes before you arrive at your destination. This allows the evaporator to dry and minimizes the formation of bacteria.