Question about 1992 Mazda Protege

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How do I flush out heater core on 1992 Mazda Protege?

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Remove all heater core hoses & use garden hose
at low pressure in both directions

How you adapt the hose end is up to you

I would guess your better to replace it

Posted on Dec 06, 2014

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1 Answer

I need the diagram for heater core hose on 97 protege


you replace the hoses not block them off .

Mar 03, 2015 | 1997 Mazda Protege

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The heater in my 2003 Protege doesn't work properly .the water is hot but the air is not . any suggestions?


The heater core could be plugged or restricted or there could be a problem with the blend door in the heater case.

Apr 12, 2011 | 2003 Mazda Protege

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What to do. my heater dosen't work in my 98 mazda protege


What exactly do you mean? The heater "core" doesnt get hot, or does the blower motor not "blow"?

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Replaced thermostat and did a radiator flush still blows cold


feel the heater hoses with engine warm. if one is much warmer than the other , it indicates a plugged heater core. remove the heater hoses and you can usually flush it iut with aq garden hose. if they are both warm, on the other hand, check the blend door operation on the heater box.

Dec 18, 2010 | 1992 Mazda 929

1 Answer

2003 madza protege5 hear does not work replace and flush out the system and changed out therostat heater core does not leak nor fogg the windshild still no heat from the vents only slightly warm air out...


What is the coolant temperature after it has been running?. If the temperature is normal and you still have no heat there may be a blockage in the heater core. I would recommend reverse flushing out the heater core to try and dis-lodge whatever may be clogging it and see if that helps.

To reverse flush it just dis-connect the hoses to and from the heater core, hook a garden hose up to the oultet side, and turn on the water.

Dec 13, 2010 | 2003 Mazda Protege

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I have a 92 mazda mx3 that i just replaced my water pump on and we thought my radiator was leaking so we put radiator stop leak in and right after that my heater stopped working the heater was working fine...


the stop leak has clogged your heater core. you may be able to flush it out if there is still some flow, otherwise heater core will need to come out.

Jan 02, 2010 | 1992 Mazda MX-3

1 Answer

1992 mazda mx3 heater blows warm, but not hot. Coolant is full, heater hoses are hot. What is wrong?


Hot air is dependent on the coolant temperature and the heater core. There are several things that can cause your problem. The easiest to check is the coolant level in the radiator\reservoir. There must be enough coolant to flow freely between the engine and the heater core. The next is the thermostat. If the thermostat is not closing it would prevent the the coolant from reaching a high enough temperature to allow for hot air. The thermostat is not expensive or difficult to replace. The third thing is a blockage in the heater core. Flush the coolant system properly can sometimes take care of this. If it does not the only alternative is a new heater core.
Hope this helps.

Sep 12, 2009 | 1992 Mazda MX-3

2 Answers

1992 mazda mx3 heater blows warm, not hot


If it ran out of water and you filled it up just before the problem started then their may be air in the system so will need bleading. If that's not the problem then could be a sticking thermostat. Vheck these first and let me know if you need further help I can advise further. Cheer's

Sep 12, 2009 | 1992 Mazda MX-3

1 Answer

No heat in a 98 Mazda Protege


See what your rad fan is doing with setting at heat, not defrost. It should only come on when temp gauge gets up around operating temperature.

Jan 24, 2009 | 1998 Mazda Protege

1 Answer

Running hot


Did you get a new one? or used and yes you need to replace thermostat , also flush radiator and system repeatedly as your heater core maybe becoming blocked buy some radiator flush and read directions! follow heater hose to engine, thermostat will be in the top line

Oct 10, 2008 | 1995 Mazda Protege

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