Question about 1989 Peugeot 405

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How do i change the heater matrix on a peugeot 405 grd and take out the dashboard

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On paper the procedure for this does indeed involve removing the entire dashboard and it really is a nightmare of a job to do. Having worked on this model before I can however give you this tip.

On the 405 the heater matrix can be disconnected from the engine side as it is connected to the coolant system at the bulkhead. If you then take out the glovebox assembly on the passenger side you will find enough room to work the matrix out towards you.

The only problem is that it is very slightly obstructed by the dash itself when you go to slide it out. If you want to avoid a day and a half of labour all you have to do is take a slight nick - no more than one inch out of the dash which is way down by the passengers feet and really not something you are going to notice a great deal.

The whole heater matrix will then slide out. The matrix can be changed by this method in around an hour. For the sake of an inch of plastic which you are really not going to notice this is the method I would advise.

The alternative is complete removal of the dash assembly for which you will need a service manual and at least a day and a half of your time not to mention the potential problems that occur from removing a dash - upsetting electrics - heater controls etc ........

Hope you find this useful. Please remember to rate my answer. Many Thanks.

Posted on Jul 17, 2009


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Have a Peugeot 406 1.8 petrol LX on a 52 plate. Smell of coolant in the cab, no visible leak, top radiator hose hot, both hoses to heater matrix hot, bottom radiator hose cold. Air con works fine.

it could be a slight leak from the heater matrix (check for damp in the passanger foot well) its self or the thermostat may be sticking this may cause the bottom hose to stay cold. you could try removing the thermostat and running it without it and then putting a rad weld in the coolant system to seal the matrix.

let me know if this helps

cheers big mike

Mar 31, 2011 | 2005 Peugeot 405

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I need to know what sort of oil my peugeot 405 GRD (1989) uses please. I'm a bit cartech useless 8-/

being diesel and its age i would recommend using a 10/40 or if its burning oil,say a pint every 1000 miles then use 20/50 most of the multigrades will be petrol and diesel.

Sep 03, 2010 | 1989 Peugeot 405

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My peugeot 205 has a grd engine i recently did a complete overhaul but i cant find the timing mark for the crunk shaft and camshaft please advise ernest

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Jun 19, 2010 | 1991 Peugeot 405

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1998 peugeot306 blocked heater matrix how to unblock

You can take the cold inlet pipe off at the bulkhead and attach a hose pipe to blow it through, make sure the water has somewhere to come out, If this does not work then most likely you will have to replace the matrix.

Feb 07, 2010 | 1991 Peugeot 405

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Hello, I have a Peugeot 405, and I recently noticed that the driver footwell is all wet. I first thought it was rain or humidity, but the problem persist even on dry wether. Anyone can help? Thanks

it sounds like your heater matrix is leaking and they are not nice to replace as the das has to come out. to confirm this check your coolant level.

if this helps please let me know
Big Mike

Jan 20, 2010 | 1991 Peugeot 405

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Heater on my peugeot 206 only blows cold air

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Jan 02, 2010 | 1991 Peugeot 405

3 Answers

Pressure buildup in cooling circuit of my xantia 1,9 diesel. no heated air inside car bubbles in radiator when lid turned open. no temperature reading on instrument on dashboard french car citroen xantia...

Combustion gas bubbles in the radiator coolant indicates a blown head gasket.
Take it to a radiator shop and get a combustion gas test to confirm.
Most likely will need cylinder head removed for inspection and replacement gasket fitted.
Absence of temperarure indication on dashboard may be due to electrical problem - check connections to temperature sensor etc.

Dec 05, 2009 | 1991 Peugeot 405

1 Answer

Heater matrix leaking on pipe joint. can i fit a new gasket??

well if you can get at it yes, if not i would just put on some radiator stop leak, (ford's put it in brand new van to stop any water leaks) it should last a fuw years or so?

Oct 22, 2009 | 1991 Peugeot 405

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Heater matrix has gone on my 405 diesel bypassed it

sounds like your inner cooler is leaking and is causing an air lock within your coolant system. Sorry to hear this, changing this part is time consuming. Hope this helps you.

Jul 26, 2009 | 1991 Peugeot 405

1 Answer

I can hear water sloshing around at the left hand side of the dashbord.Checked the drain at bottom of windscreen not blocked.No sign of water dripping.

The 405 is renowned for having the heater matrix go bad and often it springs a leak woth an associated slooshing sound. Heater matrix is like a mini radiator which is fed by water from the engine and is located behind the dash.

It is located on the lower left hand side of the dashboard. If you look under the glove box and in towards the direction of the centre of the car you will just about see it. Check the area around passenger floor and closest to the centre console for any dampness on the carpet or signs of leaking. If this is evident you have found your problem.

One solution is replacement from breakers though companies can be found who specialise in radiator repair and if you can find one in your area this is an even better solution.

Slooshing water noise like you describe is sometimes associated with impending head gasket failure but I would check your carpets first for dampness and eliminate the heater matrix first owing to it being a known failure point on the 405.

Hope this helps.

Jun 25, 2009 | 1991 Peugeot 405

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