Renault Laguna II - Climate Control | Technical matters | Back Room Forum

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Mon 10 Jun 2013 15:47

Renault Laguna II - Climate Control - Minofso

I have a problem with the climate control system. With the climate control unit on Auto and temperature set to 18 degrees on both sides; on a warm sunny day I had noticed the A/C light on but the inside of the car was not cooling down like it use to.
The car went into my local Renault dealership last Summer for re-gassing and servicing of the A/C system.
The next day which was a warm day again, I started the car and waited. The control unit was cooling for A/C again so I waited for the usual clunk of the compressor kicking in which it did and the blower fan started to increse speed to cool the inside of the car down. The display was indicating facia vents and floor vents but the air coming through these was only blown ambient temperature air.
I checked the passenger side and this was blowing very cold air from the A/C system. Both sides were still set at 18 degrees C.
I increased the drivers side to 26 degrees and hot air came through with still very cold air from the passenger side. I decreased the drivers side to 16 degrees but only ambient air was coming through.
I have gained access to the temp mixing motors (one on each side of the distribution unit) and have seen these both operate when the temperature dial is increased or decreased, only moving to two positions. The day of testing was not a warm day so I doubt the A/C would be on. Do these motors work to three positions being 1, Hot air 2, ambient air and 3, A/C cooled air?
I have read other posts regarding other issues with A/C indicating low refrigerant could be the cause but if the evaporator is cooling as mine is for the passenger side of my car, could low gas still be the cause?
Another possibillity, the internal temp sensor located in front of the rear view mirror. The fan is working on the sensor. Is there two sensors located here i.e one for the passenger side and one for the drivers side or is it just one sensor for a general inside temperature?
I apologise for the long post but I wanted to be as accurate in explaining diagnosis to you as possible.
Any solutions to this problem would be gratefully appreciated.
Thanks

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