Question about 1991 Peugeot 405

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Heater matrix has gone on my 405 diesel bypassed it

And its overheating now bled the whole system and water flowing ok just dont understand .start at the begining found water in footwell so wiped it up put more water in radiator and it happend again so i think heater matrix has gone so bypassed it and now runs fine for about 30mins and then overheats bled the whole system and still the same

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Head gasket has gone.
quick 1 since u by passed matrix does your car loose any water.
is it under pressure in radiator when running.
get back to me

Posted on Aug 19, 2009

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How do you change heater matrix on peugeot 405 disesal on a n reg is leaking in side the car do i need to remove dash

Posted on Aug 05, 2009

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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.

Posted on Jul 26, 2009

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Be sure that cooling system has been bled properly after . Start engine while cold with cap off, and heater on. Let engine get up to normal operating temperature and allow thermostat to open and close 2 or 3 times and rev engine slightly once in a while for 5 seconds or so to help improve flow. If you have rad where you can actually look in and see flow, that's better otherwise watch coolant return bottle and temperature gauge. Feel if any difference at heater as you bleed air out. Once you start to feel better /good heat, then it should be bled properly, then top up coolant return bottle and re-install cap properly. Let me know if that helps.

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Has the vehicle been run with anti-freeze its whole life? If not, then flush heater matrix.

With vehicle in cold state, disconnect heater matrix feed and return pipes from within engin bay. Turn the vehicle's internal temperature setting to hot. If the vehicle is fitted with climate control, then do this with the ignition in the 'on' position.

Take a garden hose and with low pressure first, try flushing the matrix. If the water pressure is not enough to flow through matrix at low to medium pressure, then a blockage is almost a certainty. If water does not flow at first, then try using a high pressure air-line to force air and any blockage material through the matrix and out of the exit pipe. You can also reverse the flow to blow or flush any dirt out of the other end.

Once all is clean and free flowing, reconnect and fill entire system with a 50-50 anti freeze-water solution.

If blockage cannot be resolved, then replace heater matrix.

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Excess presure in coolant system

head gasket has gone but you havent stated if its a petrol or a diesel ,because the petrol one especially does have a bleed thump screw on the heater pipe at the back of the engine but if bleed and still pressurising then its a new gasket but these engine do suffer from head corrosion in the water ports if no antifreeze used and yours could have water ports that have corroded too large to hold ,its a 405 which is a old car now so it may be cheaper to buy a newer model

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My car keeps overheating when i turn on the heat...could it be the water pump?

waterpump or water leak. check your water levels, and turn the heater temp up, if its still cold then there is either a problem with your heater matrix, air in the system or water pump is knackered. to check for air pockets in the system take the cap of your water bottle and let the engine run for 15 mins. this will let any air pockets escape, and remember to check the water level afterwards. if you heater matrix is gone then you would probably find that no hot air comes through or their are wet patches in the front passanger and driver carpets.

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No water pump issues I am aware off, are you sure you bled the air out of the cooling system? If not fill the overflow bottle all the way full, then use a floor jack and raise the front of the car as high as you can ( this allows air to go to top of radiator tank), then run the engine at high idle speed until the cooling fan ( I assume the fan works OK?) comes on, but avoid letting the engine get into the overheat area of the guage, if it does turn it off, run water over the radiator until it cools, check the tank and radiator, top off if you need to and repeat above procedure, if this doesn't work you have some other problem like no or little flow in radiator.

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