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Problem with ventilation

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13:40
September 22, 2017


gportaluppi

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Hello, I am new to this forum, I have purchased a 2002 3.0 dci Initiale about a month ago, the only Vel Satis in Argentina, was brought here by Renault for a car show back in 2004, and then sat in Renault central offices for nearly 8 years! it has only 30k kilometers, the car is really in good shape but with the typical issues…rear parking sensors not working, cruise control not working…

But the main issue is a problem I´m having with the airflow of the ventilation system, the fan works well but the quantity of air coming out of the ventilation grilles is very little, no matter what position the fan speed is placed, almost no air comes out of the vents, even if I change the position of the air selector, up, down or central, almost no air comes out.

The fan works well, I took it out and tested it out of the air box, all the speeds work OK, I've changed the particle filter, and even tested without it, the quantity of air is minimal….

All the motors movin the internal flaps seem to work, they turn slowly when changing the air flow position, I've checked this removing the glove compartment, so everything seems to be OK except, there's almost no air coming out.

Does anyone from the forum had a similar problem? any thoughts on what this problem can be? I'm guessing something inside the ventilation box must be jammed or obstructed, but to remove that part the whole dashboard needs to come out first, I don't want to go for that option for now…

Well, I hope someone can give some light on what this could be.Confused I need this fixed before summer!

15:28
September 22, 2017


dpress

Member

posts 188

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I have not had this issue myself, but have you tested the system using the recirculating function to see if there is any increase in airflow? I can only think there is a blockage caused by something just before or after the fan housing, or an electrical fault that is causing one of the many flaps to stop the airflow.

I don't know if you can check the external intake through which air enters the air conditioner compartment in the glove box, without removing the dash – is that blocked with something that has accumulated over time? The scuttle panel has some vents in it that can be removed to clear debris.

Also is the airflow equally poor in the rear, when the rear fan in on?

There is a Vel Satis digital workshop manual that is available, and it has lots of detail about the air con system, and how complicated it is! The Renault fault finding procedure is to do a 'clip' test first and connect the car computer to an analyser to find if there are any faults present. The manual gives details of 17 separate faults that could be reported by a customer, and the procedure to check and repair them, including details about the various motors that adjust airflow, such as the recirculating motor or the mixing motor.

I am not sure what cars Renault have sold in Argentina, but I am sure you will be aware that the Vel Satis shares parts with the Espace, and Laguna 11 models, so certain parts of all the systems are likely to be common, such as the various motors, flaps etc even if they may appear under different Renault part numbers.

Good luck with fixing the car, and welcome to the forum.

 

Regard, dpress

16:28
September 22, 2017


gportaluppi

Guest

3
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Thanks dpress for your info, using the recirculating function does nothing to increase the airflow, all the air intakes are clean and debris free, the rear ventilation works OK, with good airflow.

 

I will try to check  again the normal operation of the flap motors, externally, and see if there's anything unusual that I overlooked last time, but it is really annoying, I will update as soon as I can get my hands on it.

 

Regards, Alex.

18:56
September 22, 2017


bmn

St.Andrews

Member

posts 152

4
0

just  as dpress says The cabin/pollen filter is located in the glove box and it sounds that this could be choked with dust if it has been sitting in an arid area for any length of time. My own Vel Satis when parked in St.Andrews near the beach would have lot of sand in the box when I  changed the filter after 18 months. I would go for changing the filter,it would probably need changing anyway.

Welcome to the site and the best of luck.

Brian

20:07
September 22, 2017


dpress

Member

posts 188

5
0

Alex, if the rear ventilation works well, then that would suggest to me that there is no blockage either before or after the fan itself, but that the blockage must be somewhere in the front 'circuit'. Unfortunately the workshop manual does not give a full schematic indicating how the air is distributed around the car, or the layout of the pipes within the system. It could be something as simple as a foreign object that is blocking a pipe.

From your first message you indicate you have already removed and changed the pollen filter, so that is probably not the issue. I can only suggest that one of the distribution flaps is not working or a pipe is blocked, preventing air being circulated at the front, and that is likely to be close to the air conditioner box in the glove box area I suspect. If you remove the glove box liner again that may give you some room to see, although the whole unit takes up the entire passenger side – as you know if you have taken off the fan.

With the ignition only on, and no fan running you should be able to hear the flap motors working when you change the settings on the control unit – mine creak a bit as they move.

Final thought – there are all sorts of sensors that send info to the control computer, light sensor under the dash grill by the windscreen, humidity sensor in the mirror unit etc, and one of these may have failed and be causing a problem somewhere perhaps. Unfortunately if your car is the only Vel in Argentina, finding a dealer with knowledge may be difficult (!), but they might have access to the diagnostic program even if they have not used it on a Vel before. You will probably know that the diagnostic port is under the front ash tray – maybe a local Renault dealer may be able to plug their machine in and help you? 

 

All the best, dpress

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