Heater intermittent problems

[IC99]

Hi.

I’m hoping someone can assist me.
I have a Qashqai on a 67 plate.

2 days ago I noticed the heater became problematic and intermittent.

Heater would kick in and I would put to max volume to help clear the ice.

Worked fine and then I would reduce to 2 bars instead of 7 bars.

When I then tried to move up from 2 bars the display would indicate the increase but the fan would not increase.

Tried switching the blower off. Left for 5 mins and tried again.

Worked in exactly the same way as I described above.

Has anyone had this before or know what the fix is?

Many thanks for reading this as this is my first post.

Also. Thanks in advance for any replies I may receive.

Ian

[calnorth]

Does the fan goto full speed when you press Defog and which brings aircon ON

[IC99]

Hi. Thanks for the reply.

Yes it does.

[fbgqashqai]

and what about the auto setting does that seem to provide variable fan speeds?

[IC99]

Hi. Yes it does.

[IC99]

Auto and Max both work.

However when you switch this off and try to adjust the fan speed down it does go down.

However when you try to increase the fan speed it does not.

[calnorth]

From what you say that clears problems with both the fan motor (Blower) and its electronic controller (Power Transistor unit).

This leaves a possible problem with the A/C Controller Unit and communications to the Fan switch (buttons). This can only be tested with Nissans CONSULT tool. The A/C Controller has a number of sensor inputs. Its also possible that an error code exists (DTC) which would need a scanner/CONSULT to extract. No quick fix seems to be available.

It worries me...i have the same car

[IC99]

Thanks for the reply.
This sounds expensive..........