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Renault Laguna I - Phase 2 - Heating and Cooling - Heater Fan 1,2,& 3 speed not working + FIX

182K views 112 replies 62 participants last post by  Jlbsmart 
#1 ·
Renault Laguna I - Phase 2 - Heating and Cooling - Heater Fan 1,2,& 3 speed not working + FIX

Hi Just thought I would share with you how I have fixed a Laguna heater blower that worked in speed 4 but not in 1, 2 or 3. The root of the problem is there is a device called a Thermal Fuse in the circuit for the 3 lower speeds but not for the top speed. Once they blow they have to be replaced. These special fuses can be obtained from somewhere like RS Components. Have a look at:

http://www.maplin.co.uk/search.aspx...u=y&criteria=Thermal Fuses&doy=15m1&worldid=3

This is what the fuses look like. You would have to check that is has the current carrying capacity of the one fitted to the resistor pack which is 16 Amps at 240 Volts or 25A at 120V. I bought mine from RS some years ago, picking up a couple at the time, I knew it would come in handy eventually!
Also look at :
http://www.atconline.com/microtemp-detail.htm

It is located in the resistor pack that is inserted into the airflow, the Haynes manual calls this the "Heater Blower Motor Resistor/Control Unit". Note the Haynes manual says this unit on a car with Air con cannot be renewed seperately - correct, but it can be repaired! I have done the same job on both types now!
1. Extract the unit, on the aircon you have to leave the unit dangling on it's wiring harness.
2. remove the aliminium shield by bending the lugs straight and gently prising it off.
3. identify the fuse and snip it off leaving the legs attached to the terminal posts(Important this otherwise you will not have anything to connect the fuse to!). You can gently bend the curly resistors out of the way , putting them back once finished.
4. :steam: Now comes the fiddly bit! As the fuse cannot be soldered in (it would 'blow' because of the heat) you have to fit the fuse by mechanical means. I used some small plastic terminal block ( 5 amp size , I think), sometimes called chocolate block, with the plastic cut off. This leaves you with a small brass tube with 2 terminal screws in it. Arrange the tubes and the fuse so that the fuse is in circuit but not touching any other part of the circuit eg the curly resistors, It doesn't matter which way round it goes!
5. put the shield back on, bending the tags over again and double check to see there are no undesireable shorts anywhere
6. Put the unit back in connect up and away you go.

I am an electrical engineer so found this a fairly easy task but any competent DIYer should be able to save them selves £50, the fuse costs about 50p
HTH

Sorry meant to add: my fuse was marked
MICROTEMP This is the manufacturer
TFDAGG
G5A01 This is the part number
TF110C This is it's 'blow' temp ie 110 degrees C
 
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#57 ·
Re: Renault Laguna I - Phase 2 - Heating and Cooling - Heater Fan 1,2,& 3 speed not w

Hi, I've just tried this fix but can't find the thermal fuse, the heater blower resistor is a printed circuit board? I couldn't find anything that resembles the resistor pack described in earlier posts.. Is it part of the blower motor??
Help my car's freezing..
:confused::confused
 
#58 ·
Re: Renault Laguna I - Phase 2 - Heating and Cooling - Heater Fan 1,2,& 3 speed not w

Hi Ben, my resistor unit is nothing like the one described, it is flat and covered in a sort of insulating hard foam and the fuse is right at the end, I bought the fuses described in your post but this one is different it has ' 240 KR1 3301' written on it, is it still 110 degrees or 240? could you advise please, my car has air-con.
 
#60 ·
Re: Renault Laguna I - Phase 2 - Heating and Cooling - Heater Fan 1,2,& 3 speed not w

Hi Ben, my resistor unit is nothing like the one described, it is flat and covered in a sort of insulating hard foam and the fuse is right at the end, I bought the fuses described in your post but this one is different it has ' 240 KR1 3301' written on it, is it still 110 degrees or 240? could you advise please, my car has air-con.
Just realised this is for a laguna 1, mines the later model, just snipped the original fuse off and fitted the new one using the choc block cable connectors and it worked a treat. Thanks Ben you saved me a few quid there.
 
#62 · (Edited)
Re: Renault Laguna I - Phase 2 - Heating and Cooling - Heater Fan 1,2,& 3 speed not w

Done and dusted in 20 min.

Laguna 1 PH2 2000 1.8 16v Air coned

Removed glove box. The resistor unit sits on top of the fan.
Mine might have been done in the past as there aren't any retaining springs for it.

Removed the 2 plugs otherwise it cannot be removed. Pushed the cables on the side.

Took the unit out. removed the heatshield. Chopped off the faulty fuse by the PCB pins. Took it out. Chopped off the 2 fuse retainers from the PCB pins. Took the rest of the fuse legs out. Bended the new fuse legs as the old ones.

Replaced the new fuse on the PCB retainers and pushed them back in place. Soldered the PCB pin with the fuse legs and the PCB retainers.

When soldering, remember to place the solder on the soldering iron and then just touch the fuse legs and do not keep it there for long.

Put it back in place and make sure it works. Remove again and put the heatshield back on.
Plug it in and off you go.

THANK YOU everybody for the guide.

Forgot to add. Mine was a 128 degrees fuse
 
#63 ·
Re: Renault Laguna I - Phase 2 - Heating and Cooling - Heater Fan 1,2,& 3 speed not w

Hello there
Please help help help
I have renulte laguna II 1.6 petrol -2002-I just bought it in the summer time -now
I just realised that’s the front air vent not working they located a above the radio and
On dashboard side -but the vent for screen heater are working no problem I have no problem
With the fan as I hear the sound on vent front screen .any body can help why they not working ?
 
#64 ·
Re: Renault Laguna I - Phase 2 - Heating and Cooling - Heater Fan 1,2,& 3 speed not w

Hi - have you checked that the rotary knob is not stuck in closed position? Or that the main heater control knob is working and not not set for windscreen only? If these are correctly set, I think the duct supplying the centre veny may have become dislodged. I've no experience of this but I would think that in that case you will have to take the dashboard out.
 
#65 ·
Re: Renault Laguna I - Phase 2 - Heating and Cooling - Heater Fan 1,2,& 3 speed not w

Laguna 11 resistor pack on my 02 reg 1.9 DCI estate has the ''W'' shaped fuse wire on the back of the circuit board. I removed it from the blower housing and inspected it. I found that the ''w'' fuse had parted company with the solder. Easy fix and no cost!!!
 
#66 ·
Re: Renault Laguna I - Phase 2 - Heating and Cooling - Heater Fan 1,2,& 3 speed not w

I fixed my W plate Laguna yesterday.
I actually managed to get the old thermal fuse out completely using a very fine screwdriver to prise open the spades that hold it at each end.
I then fitted the new one in exactly the same way as the original and you would not know the difference.
Naturally, the fan works in all 4 speeds now.
Many thanks to all on here who found this solution. Brilliant! :d
 
#67 ·
Re: Renault Laguna I - Phase 2 - Heating and Cooling - Heater Fan 1,2,& 3 speed not w

Hi folks, I bought an '04 Laguna 1.9dci sport tourer with the 'fan only works in position 4' problem a few weeks back but thanks to this thread I soon knew what the problem was.

At first I bought a couple of 110C fuses from Maplin on the assumption that I would find the type of resistor pack that comprises a circuit board with coiled wire resistors and a raised metal cover, but it turned out I had the flat ceramic one covered in green cement sealant and the markings on the fuse were illegible.

I fitted a 110C fuse anyway (and cleaned out the pollen filter and surrounding ducts), but the fuse lasted one journey. Reading that others had used 128C fuses, I fitted a 133C one and this has survived two trips so far, but I wondered if anyone could tell me the official fuse temp on this type of resistor pack just in case I have to replace it again.

Thanks
 
#68 ·
Re: Renault Laguna I - Phase 2 - Heating and Cooling - Heater Fan 1,2,& 3 speed not w

I'm trying to save a young mum £70 plus vat at the dealer for the same car as Linker3000, Laguna 2 DCi with the pack surrounded by green cement. I've fitted a 110c fuse but in view of Linkers post am now wondering if that is the correct one.
Can any of you sparky bods enlighten us as I don't want to fit a larger one if that would be dangerous in any way?
Thanks in advance and a very very worthwhile and helpful original post, thanks again!
 
#69 ·
Re: Renault Laguna I - Phase 2 - Heating and Cooling - Heater Fan 1,2,& 3 speed not w

Ok, sodding Renault. I've uploaded some photo's to show the heater panel removal.
I had a mate turn up with a resistor in her hand saying that someone had told her this was the cause of her fan not working. I changed the heat fuse on the top of the pack by carefully cutting the old one off and butchering a small domestic 5amp electric block to use as a connector.
The thing is it WASN'T the resistor.
The way to tell without p!ssing about is this:
If it blows on 4 only, it's the resistor. If it all dead like mine was it's either the motor or the panel.
The motor + and - are easily accesible and I flashed the terminals to find the blower motor worked, so having checked the 20 amp fuse on the drivers side panel was ok the only other thing it could be was the panel. It's quite easy to take out and doesn't really need the radio removing although I pulled it forward to get better access.
Remove the ash tray by gently pulling it towards you and then the key card panel which surround the heater panel and also just gently pulls towards you and out, connected at the bottom with a block connector which you can remove without fear of having to re code and all that kak. The panel is held by two small star head screws and you the coax it out disconnecting the wire and cables at the back.
I then checked all the wiring which looked ok but the + terminal on the panel showed signs of burn and THAT was the problem. Sadly the one bought off ebay to replace was as bad and didn't work, so as a "put me on" I wired the positive side of the power block (top right but check with a continuity test lamp) to the second speed fan wire on the same block ( left hand bank opposite the positive side) and Robert was your fathers brother, on came the fan with the ignition on and off when it was switched off. The heat can be adjusted by pulling the bowden cable in and out as and the direction of flow. It's a temporary measure until a new unit arrives but I hope this clears up things for others if they follow the primary checks I did in checking the fuse then the motor.
So to summarise: If the fuse is'nt blow, does it work only on 4..if so it's you resistor. If it doesn't work on any number it's either your motor or the panel. If you flash the motor direct and it works it's the panel, if not it's the motor.
I must say it's a poor design , the filter MUST be changed regularly or you will start getting these issues.

The reverse lights on this car do not work. I have changed the switch and all the bulbs are new. I gather the heater panel shares the same fuse so I'm putting it down to the control panel and hoping that we will have light when I remake all the connection to a good unit, but I have never worked on such a cheap and nasty product...sorry Laguna owners.
 

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#71 ·
Re: Renault Laguna I - Phase 2 - Heating and Cooling - Heater Fan 1,2,& 3 speed not w

How long did the 133 last Linker?
Is your fan free to turn under very little finger pressure?

I'm not that deep into the electronics side which is why I've asked for help without success.

If your heat fuse is blowing at 133 it's certainly getting hot or the internals of the green resistor are shot and the replacement of the heat fuse is a waste of time.

I've stripped the original three button panel down on my problem to its component parts to find the holder arm for the fan speed dial was melted due to arcing which must have got progressively worse. I have rebuilt the arm usin aroldite and await the car to see if this will work. All I know is the 110c fuse I fitted to my problem is still working with the control panel remove and the positive side bridged to fan speed 2 so I'm hoping the "repaired" control panel will be the answer

Best of luck
 
#72 ·
Re: Renault Laguna I - Phase 2 - Heating and Cooling - Heater Fan 1,2,& 3 speed not w

In addition to my last, the control panel was at fault on the vehicle I was working on. I couldn't find a decent one for a reasonable price so I stripped the old one down. It's quite easy and just a matter of easing platic clips to release the fron panel and then the rear. This eventually reveals that at the back of the fan speed control knob is a plastic arm with a copper saddle that runs in a track. Obvioulsy what had happened is that with time the track had got dirty and caused a bad contact. This had caused arcing and melted the arm to the point where it no longer made contact. With a little time and effort and a tube of araldite I managed to make good the dodgy arm put it all back together and so far it has been fine.
 
#73 ·
Re: Renault Laguna I - Phase 2 - Heating and Cooling - Heater Fan 1,2,& 3 speed not w

Hi, I have a Renault master van 2004 and the blower ONLY works on speed 4, could the thermal fuse be the issue with my master van too or is it something totally different? Any help is grateful
 
#74 ·
Re: Renault Laguna I - Phase 2 - Heating and Cooling - Heater Fan 1,2,& 3 speed not w

The short answer is yes.

If the fan is working at all it is getting power, so the main fuse and electric supply are ok.

It will be either the fan speed switch, which are common faults across the range, are easily stripped into component parts and repaired if you are at all handy, or the resistor pack/ thermo fuse which give your symptom of only working on four.

The fan speed switch is a simple device. It has an arc of copper as a connector to the motor wiring via the multiplug at the back, onto which a plastic arm with a copper saddle that runs in the arc is connected at the back of the bit you twiddle. It gets dirty over time and causes bad connection, which then starts to arc the power, spark and heat up the copper saddle in the plastic arm. This over time melts the plastic arm and it just gets progressively worse until the system stops. Maybe this problem causes overheating in the thermal fuse as the power isn't flowing as it should thus altering resistance and blowing the fuse but the entire system is a cheap nasty thing.

There have been quiet a few on here with blown thermo fuses. It is apparent that they blow when the system is overheating as they are designed to do. What causes this? Leaves and general dirt blocking filters and fans? Lack of lubrictaion in the fan motor bearings causing it to run hot? Poor
contact at the switch? Either way they are easily rectifyable and the fuse is easily replaced and cheap.

What I would do is take out the fan speed control and use a piece of wire to cross the power feed directly into each fan speed port (which is only what the switch does). Find the power using a simple 12v test light or bulb with wires attached + and - with the ignition on. Connect one end to any metal part of the body and go down each port in the block until the bulb lights and that is your power feed (sorry if that is a suck eggs instruction but I don't know how much you know). If you get it wrong the only thing you will do is blow the main fuse in the fuse box for the blower, not the end of the world.


The connector should have + and - on the same bank (on the Laguna it's the right side) and all the port for the four speeds on the other so you can go down each one and see if the fan works on 1 2 3 and 4. If it does it is more than likely the switch. If it doesn't the problem will be the resistor system.
Whilst you have it out it's a good idea to strip the control down and have a look in the back to see if the connector are clean as although it may well be your resistor fuse, what has made it blow? My money is on the switch! but make sure the filter and fan are clean and free running.

If you're ok with diy and confident it's simple stuff, If you're not sure though, don't.

Hope that helps. Best of luck. Let us know.
 
#76 ·
Re: Renault Laguna I - Phase 2 - Heating and Cooling - Heater Fan 1,2,& 3 speed not w

The answer is on here somewhere but as I'm still waiting for a simple thankyou or kiss my ass from Jgttdi :mad:
I'm tempted not to help...It's a good job we are not all the same insn't it: :loser:

It's in the heater blower motor casing towards the rear accessed from underneath it so you have to get into the passenger side foot well and do a good impression of a contorsionist up under the glove box. It has a wire connector block running to it and is taken out by removing two small alloy headed screws, I think they are 10mm
 
#77 ·
Re: Renault Laguna I - Phase 2 - Heating and Cooling - Heater Fan 1,2,& 3 speed not w

Hello Gents

I'm a new bloke, hailing from Kenilworth, Cape Town RSA. Although I have been a member here before, career and location changes the last 18months prevented me from checking in here more often.

I have been driving Renault cars since the mid 60's and had purchased most of them imported or assembled in South Africa over the years - including my beloved 'settee' - an R25 2l which I bought slightly used from the French embassy.

About a year ago, I sold my '86 11TXE hatchback as it was seldomly used.

My current Renault is a 2001 Laguna 2l 16V with climate control and loaded with all the rest.


My current problem: I used the car yesterday and turned on the airconditioning as it is almost 40degrees C here at the moment.

About a block away from my home, I smelled burning plastic. I stopped, lifted the bonnet and saw nothing amiss.

I decided to return to the safety of my driveway which was just as well.

Smoke started coming from the airvents. On arrival home, I immediately disconnected a battery cable but since I was unsure how far the potential fire had progressed, I called a friend to bring over a fire extinguisher.

This morning, I had a good look around under the dashboard on the passenger's side.

Eventually, I discovered it was the blower motor which had started burning. NO looms appear to have been damaged or overheated.

I have a pic of the blower/fan and will try to upload it here so you can see the damage.

What do you think could have caused this problem?

Is something blocked? All fan or climate controls worked normally before this. As it is so hot here, I set the climate control to 16degrees C and this worked as well, prior to the burning.

The blower's brand is Behr Buono, made in Italy. I am at present trying to locate a replacement but haven't as yet contacted the local agents as their prices are likely to be astronomical.

IF I find and fit a replacement, do you think I should first look at any related cause of the cooked blower before fitting a replacement?

Regards to all

11TXE/andre
 

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#78 ·
Re: Renault Laguna I - Phase 2 - Heating and Cooling - Heater Fan 1,2,& 3 speed not w

11 TXE Andre
Count yourself lucky It's minus 4 here! Regards to Capetown!

You wil probably find that if the wiring has not been affected at all that it is just the motor that has given up. If the fuse has not blown to the system and you have 12volts to the motor feed you should be fine. Does your Laguna have digital air con or the cheaper dial type that has associated problems I describe above in detail?
If it is digital it will probably be just a new motor but run it and keep your eye on it for say 20 minutes after you have fitted it just to make sure. I would also make sure your cabin filter and vents that feed the duct to the motor are clean as the filters get really bad and should be changed regularly especially in dusty conditions and the feed ducts under the screen panel get gummed up with dirt and leaves!
 
#79 ·
Re: Renault Laguna I - Phase 2 - Heating and Cooling - Heater Fan 1,2,& 3 speed not w

Hello Nosun

Much obliged for your kind reply. Thanks too for 'regards to Cape Town' - it's as hot as hazes and wish you were here for a beer.

The car has digital indications for climate control.

Leaves and other debris is always a problem - especially the space below the wiper blades but I do clean there by vacuuming periodically.

The car is at a workshop now, awaiting a blower motor. I will call the bloke later today and ask him to clean the motor duct and elsewhere as the same problem will occur if this is not done.

With best regards to all from Cape Town:d

11TXE/andre
 
#80 · (Edited)
Re: Renault Laguna I - Phase 2 - Heating and Cooling - Heater Fan 1,2,& 3 speed not w

The idea of a beer in Capetown right now has brightened my day, never mind the memories of Hermanus, Gans bay and Knysna, you have a beautiful country!
I'm sure it will be fine now. If the control is digital it will be the motor that has just had enough....it is FrancoItalian after all :crazy:
Just keep the vents under the wipers and cabin filter clean. You can imagine that it is only cooled with air coming in from outside and if that air is already at 40 degrees it's working hard before it starts. If you then block the air stream it will give up...I think you and I would under those conditions!

Best Regards
 
#81 ·
Re: Renault Laguna I - Phase 2 - Heating and Cooling - Heater Fan 1,2,& 3 speed not w

Hi mate, can you help me? I have Laguna 1.9 dci 52 plate, when I turn the heater/cooler speed dial it works fine 1,2and 3, when I turn it to 4 it switches off. I tap it and fiddle with it and it will come back on, can you give me any idea's to solve it? It's a similar problem to what you had but the other way round, 1,2,3 work fine 4 doesn't. Any help would be appreciated. It's a pretty new system, new radiator , intercooler and air con radiator and gas only about 3 month ago.
 
#82 ·
Re: Renault Laguna I - Phase 2 - Heating and Cooling - Heater Fan 1,2,& 3 speed not w

Presuming it's a dial type switch and not digital.......Dodgy switch gear at a guess. Whip it out, strip it down and check the copper arc at the back is clean and making a good connection...otherwise it just gets worse as heat is created and the back of the dial which is plastic and holds the copper saddle, it can start to melt which just makes it all worse.

You have power
The motor is working
The fan works on the first one two or three speeds

SWITCH not making good contact to position of fan speed four
 
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