
How a heater works on a Toyota Previa 2
In the middle of winter it is our best ally on the road when we go to work. And when the latter does not work well we quickly regret it. In this case to know where the problem comes from, we will have to know how it works on this Toyota Previa 2, at least the basics. The heating uses the heat from the engine block to raise the temperature of the personalised tour, then very often from the cooling system. Therefore this system has several functions. In a similar way, the fan system, so that the heat arrives in the cabin, also has a duplication. It's the ventilateur which sends heat when the automobile rolls slowly or or not at all, then it is speed of the vehicle which will send the heat when you are driving faster. Well designed, right?
Recurring problems with a heater on a Toyota Previa 2
Broken thermostat
The concept is easy, if the thermostat that regulates the heat does not really capture the temperature of the water circuit, the latter is affected. Even if the thermostat of this Toyota Previa 2 does not activate properly, the heating will work normally. Quite simply because the natural heat of the engine block will increase over time, then the water circuit in the same way, whether the thermostat is working or not. Our only annoyance is that you will have a hard time changing the air temperature.
Air flaps blocked on the Toyota Previa 2
It is a concern that occurs quite frequently. These shutters, which allow you to direct the air or adjust the intensity, sometimes get blocked over time. To remedy this it is simple, remove the cover and look inside how it was done. Activate the mechanisms to see where it is blocking. Put a little WD 40 to lubricate and voila.
Defective fan on the Toyota Previa 2
You have now entered, the fan is only effective at low speed or in neutral. If it happens that this heater does not generate too much air at low speed and yet you still discern its noise, it is because your fan will most likely be out. Usually, with a higher speed the heater of this Toyota Previa 2 will turn. If it happens that the fan does not really activate, it should be changed.
Blocked hoses
The symptoms will be quite obvious. When your heater turns on but does not heat up or very slightly, the problem is probably with the hoses. Over time, they get dirty and no longer allow hot water to reach the heating of this Toyota Previa 2. In this case, wash the hoses or replace them with new ones.
Air pocket in the circuit of the Toyota Previa 2
The symptom is sometimes the same as that of the hoses. If it happens that small air pockets have got inside the circuit, the high temperature water will also have problems reaching the heating radiator of this Toyota Previa 2. In this case, it will suffice to bleed the circuit.
Conclusion
You now know where the problem will be born from. Having said that, it is possible that the reason may have come from another place, such as the air duct of this cluttered Toyota Previa 2, or a broken valve, however it is nevertheless rather rare. You can write a comment if this text helped you. See you soon !