Seat Alhambra Mk2 (7N) - Fan (?) noise when engine cold - Nutkey

When the oil temperature is low (below about 70 degrees), there is a noticeable fan-like noise coming from the right hand side of the car. It is unaffected by the cabin airblower speed, and it remains for some time after the engine is switched off. If anything it got louder shortly after I popped the bonnet to take a look.

I have only noticed it since the ambient air temperature got close to freezing. Haven't yet identified where it is coming from, but if I stand in front of the car and pop the bonnet, it is on my left. There is a component just behind the cornering light that has a hose exiting it (this hose then appears to be a drain of some sort, because it drops straight out of the bottom of the car. It *might* be coming from this. The big radiator fans at the front of the car are not spinning.

It seems pretty reproducible in cold conditions. I captured a video of the noise - it's pretty constant in pitch.

Seat Alhambra Mk2 (7N) - Fan (?) noise when engine cold - elekie&a/c doctor

Is this a petrol or diesel?What year and engine size.?

Seat Alhambra Mk2 (7N) - Fan (?) noise when engine cold - Nutkey
2013 Diesel 2.0
Seat Alhambra Mk2 (7N) - Fan (?) noise when engine cold - elekie&a/c doctor

Is this car fitted with an auxillary heater unit?(webasto).These will operate when ambient temps are very low to assist warm up of cabin.

Seat Alhambra Mk2 (7N) - Fan (?) noise when engine cold - Nutkey
Possibly - but why would it run with the engine off (key out)
Seat Alhambra Mk2 (7N) - Fan (?) noise when engine cold - elekie&a/c doctor

Anything in the owners handbook under heating and ventilation?

Seat Alhambra Mk2 (7N) - Fan (?) noise when engine cold - Nutkey

Assuming you are talking about the auxiliary cabin heater, it's mentioned in the manual as an option on p164. However, it does not appear in the MFD config, nor are there any controls for it on the dash. Not that the manual description precisely matches what the climatronic controls look like anyway...

However, looking at the workshop manual I got off fleabay, it seems that there's an auxiliary heater in precisely the position I mentioned in my original post.

Some relevant points from it are - it starts when coolant < 69C and ambient < 5C, which fits with what I've observed so far. It seems likely that it's the circulation pump making the noise.

... and

When switched off manually, or after a maximum operating time of 60 minutes, or the coolant reaches a temperature of 84C, combusion is ended and the run-on mode begins. The circulation pump V55 and the combustion air blower V6 however continue to run to cool down the auxiliary heater and are switched off automatically.

The post-operation period of the circulating pump V55 and the combustion air blower V6 depend on the operaitng mode in which the auxiliary heater was switched off. The post-operation period is 175 seconds when heater is switched off during full-load, and 110 seconds for part-load.

Having read the chapter on the axuliary heater in the manual very carefully, it does say much the same thing. So all I have to do is have a careful feel to see if it actually gets hot, and time the run-on to verify that it is really that making the noise. Still seems loud to me, but I can understand why I haven't heard it previously. This is my first winter with the car (or with a diesel).

Now I'm just puzzled as to why I have an aux heater but no controls for it.

Seat Alhambra Mk2 (7N) - Fan (?) noise when engine cold - Nutkey

Thanks for the pointer to the aux heater!

 

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