Hello, I have an Alphard 2004 with a 3.0l machine. My heater doesn't work. It has enough liquid and the thermostat is working. Does anybody know how to clean the heatexchanger or how to replace it.

A manual would be marvelous.

Greetings Karsten 

On 9/3/2024 at 9:51 PM, karsten doering said:

Hello, I have an Alphard 2004 with a 3.0l machine. My heater doesn't work. It has enough liquid and the thermostat is working. Does anybody know how to clean the heatexchanger or how to replace it.

A manual would be marvelous.

Greetings Karsten 

 

You may need to bleed the heater system.

 

I don't know how, but other members do; so you should get an answer soon.

Thanks for your answer. I will do so. Does anybody know where the heat- exchanger is. I want to clean it.

The heat exchanger is up inside the dash board 

I checked it, there is no air in the System. 

But i just noticed in the rear the heater is working. Does anybody know what the reason can be? 

Is the temperature control flap moving?

 

This video will help to locate it 

 

Great Link and video. Thank you very much.

I can't say if the actuator is moving it doesn't make any sound. Can you hear it if it is moving?

If you turn the temperature all the way to maximum and all the way to minimum you should be able to hear it moving the flaps to either end of its range.  You might be able to see some of the mechanism moving as well. 

Ok thanks, good idea.

I tried that and there is no noise where it should be, regarding your video. 

At the back I could hear a noise. So probably thats the reason.

Next week I will have someone reading out the computer connecting via the OBD port, which toyota couln't read. Then I should be save with the diagnosis. 

Great help, thanks.:)

I removed the Plastic paneling. And did not yet repair anything,  and now the front heater is working and the front flip is moving. but in the back the air is cold.

I have no idea what happend. Is there any part I could have touched which regulates back and front?