Question about 1991 Peugeot 405

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1998 peugeot306 blocked heater matrix how to unblock

1998 peugeot306 blocked heater matrix

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Hi
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.

Posted on Feb 08, 2010

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The heater matrix may be blocked or has an airlock.

Set the heater controls to hot - fully open - and leave them like that when you drive the car. When the car reaches normal operating temperature any air in the heater matrix should be 'bled out'. Then check your coolant level.

If the matrix doesn't have an airlock - it may have a blockage caused by corrosion/limescale. If this is the case, any car parts store should be able to sell you a bottle of something to unblock (if possible) the heater matrix.

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Hi it sounds like either the thermostat or the heater matrix, although if there is air in the system then this would also cause this fault. get the thermostat checked first as this could cause more damage if not fixed quickly.

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I have no heat and the front windows will not defrost at all, back is fine, windows fog up all the time. The guage is fine it moves and is in the normal range once the car warms up. I want to go to a...


SOUNDS LIKE YOU MAY HAVE AIR BLOCK, OR BLOCKED HEATER MATRIX, CHECK FIRST CHECK THE HEIGHT OF THE HEATER MATRIX IN THE CAB , IF ITS HIGHER THAN THE FILLER/EXPANSION TANK. THEN COULD BE AN AIR LOCK, LOOK FOR THE HIGHEST PIPE AND SEE IF THERE IS A BLEED VALVE, IF NOT TAKE BOTH PIPES OFF THE MATRIX FEEDS (TWO PIPES GOING FROM ENGINE BAY TO INSIDE OF CAR, AND FLUSH OUT WITH HOSE TO SEE IF IT IS BLOCKED, AND RECONNECT LOWEST PIPE FIRST AND FILL SYSTYM TILL WATER APPEAR FROM TOP AND RECONNECT RUN MOTOR, AND KEEP TOPIN UP,
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1st your fan motor may be going or something has fallen in the vents you will need to gain access for that, or it might be YOU MAY HAVE AIR BLOCK, OR BLOCKED HEATER MATRIX, CHECK FIRST CHECK THE HEIGHT OF THE HEATER MATRIX IN THE CAB , IF ITS HIGHER THAN THE FILLER/EXPANSION TANK. THEN COULD BE AN AIR LOCK, LOOK FOR THE HIGHEST PIPE AND SEE IF THERE IS A BLEED VALVE, IF NOT TAKE BOTH PIPES OFF THE MATRIX FEEDS (TWO PIPES GOING FROM ENGINE BAY TO INSIDE OF CAR, AND FLUSH OUT WITH HOSE TO SEE IF IT IS BLOCKED, AND RECONNECT LOWEST PIPE FIRST AND FILL SYSTYM TILL WATER APPEAR FROM TOP AND RECONNECT RUN MOTOR, AND KEEP TOPIN UP, YOU CAN BY A COOLENT FLUSH SOLUTION TO CLEAN THE SYSTYM OUT

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