Strange smell with air recirculation on -no ac- - Alfa Romeo Forum
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(Post Link) post #1 of 8 Old 11-01-16 Thread Starter
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Strange smell with air recirculation on -no ac-

After i changed the pollen filter I've noticed a weird smell that occurs when the air recirculating is turned on. The smell reminds me of petrol, plastic, white spirit or something like that. I've not used my AC at all as it's cold winter here.
What could it be?
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What is your engine type???...
For 22JTS where exist well known place for petrol leak.
For 19JTDM DPF regeneration smell may be really nasty. It comes from wet outer lining smolder. Same for 24JTDM.
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(Post Link) post #3 of 8 Old 11-01-16 Thread Starter
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Thanks for your reply.
It's a 1.9 8v jtdm. What does "wet outer lining smolder" mean? Where is it located and why is it only present when recirculation is active? What can be done to fix this?
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(Post Link) post #4 of 8 Old 11-01-16 Thread Starter
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Just to clear, the smell is always present when the recirculation gets turned on. I usually leave it in auto, and when the red circle gets lit, the smell occurs.
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(Post Link) post #5 of 8 Old 17-01-16 Thread Starter
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Any other suggestions on this topic?
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Status: 159 2.4 20007 plate 19,500 DPF/EGR by Adie (AHM)
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It could be the fan controller. it is mounted down beside the passenger footwell. The smell, to me, is like TCP. It is caused because the plug connection becomes loose, gets hot and starts to melt the plastic which then smells as I have described.

In the passenger footwell below the glove box is a piece of hard backed carpet held in by two thumb screws. Remove he thumb screws and that releases the carpet. That reveals the heater blower; at the front and between the blower and transmission tunnel is the resistor. It has two cables attached and is held in by two 5.5mm hex headed screws (5mm is to small and 6mm to large) so make sure you have the right size socket before starting.
Remove the connectors and then the screws. When you drop the screw behind the carpet a standard self taping screw or similar will suffice to replace it!
Now on my wife's car the heater had smelt of burning for a while but I did not need to renew the resistor. It seems that a poor contact between the black cable large connector and the connector spade on the resistor was the problem. A careful bend on connector improved the contact and and voila all working and no TCP smell! 20mins job done.
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OK, thank you. I'm not familiar with TCP so I can't say if that's the same smell. I'll investigate a bit further, but I can't figure why the smell occurs when recycling is turned on.
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Status: 159 2.4 20007 plate 19,500 DPF/EGR by Adie (AHM)
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I thought that I would add a few pics to the threads on heater blowers not working or strange burning / disinfectant smells when it is switched on.

These show where the component is, how it is held in (I dropped a screw down behind the carpet the previous time I attended to this so the cross head screw replaces the normal 5.5mm hex headed screw.)

Under the glove box on passenger side the carpet is held in place by two large plastic nuts that are undone with your fingers, remove these and the carpet under the glove box pulls down and out towards you to reveal what is in the photos. Front right is the item that must be removed. In the early photos (due to poor light) it looks almost black but it is actually blue. Remove this, clean and close the connectors and refit.

Note1: some are so badly burnt that they can't be repaired this way.
Note2: this blue item has a heat sink built into the other side (note shown in the pictures) and that will get hot enough to burn your hands if you run your heater with it out.
Note3: the original hex headed screws are 5.5mm. 5mm is too small and 6mm is too big. 5.5mm or 7/32" if you have one!
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