Nissan Car Climate Control Ac

[tilvin]

I have a Nissan Wingroad WFY11 model. In its blower knob, there is auto position. In the morning when you keep that in auto position and temp set at 22.5 C and it works fine. The blower fan speed controls accordingly with the temp. But if I shutdown the engine and start again the blower fan speed will work with full speed continuously. Fan speed will not reduce after 10 minutes even. Also after some time there is a hot metal burning smell coming from the A/C if it continuously run. What I do is put the blower speed in 2 or 3 and on/off AC periodically to stop this annoying smell. Also when a diesel vehicle with full of smoke(Visible grey/white smoke) passes, I can able to smell significant exhaust smoke as well. But I am keeping AC in recirculation mode. What can be wrong? Any experts please help....

[The Don]

There is a resistor in the blower compartment that is responsible for controlling fan speed. What you might be smelling might be this resistor heating up, which it does after normal function.

Basically when the car starts from cold mid day, the interior is warm so it is normal for the system to start at full speed, and then after a while it will cool down and slow down. As you can understand the ambient temperature is around 30C and inside the car it can be even warmer due to the green house effect.

The above resistor does become faulty after a while, but is cheap to replace. Its heat stink might also be covered in gunk. So this might be the reason why the fan speed operation seems to be buggy. When did you last have your AC serviced?

[Magnum]

Could the smoke smell be caused by a clogged A/C filter?

[tilvin]

Thanks guys for your suggestions and great support as usual...

And what do you think causing my other problem? stated in red below.

Also when a diesel vehicle with full of smoke(Visible grey/white smoke) passes, I can able to smell significant exhaust smoke as well. But I am keeping AC in recirculation mode. What can be wrong? Any experts please help....

[The Don]

Recirculation mode does not completely seal the outside world. Its a plastic flap that changes around so most of the air is circulated. You do realise if you achieve 100% re circulation you will die due to oxygen starvation.

againg gunk on the lines could affect the flap operation, but its also possible the cable thats supposed to make the recirculation has either come off, stretched or faulty.

As with most things you need to take a few of the plastic bits around and observe whats going on. We can discuss till the sun comes out but its no substitute for a closer inspection. Any AC shop will do it and your mechanic can manage it as well if you are not handy with a screw driver.

[tilvin]

Thanks guys for the support.....