Question about 1996 Mazda MPV

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Mazda bongo 2.5 turbo diesel 1996. over heating

The bongo is over heating. recently the main water pipe under the drivers seat spilt, the one going to the top of the engine. i replaced it, but now bongo over heats. the temp gage goes to high you can hear the water boil in the header tank then all of a sudden it goes back to normal.also whilst it is boiling the interior heater doesn't work, but when it stops the heater works fine. i have put in a new thermostat and flushed the radiator thru still keeps over heating. could it be the head gasket?
please help

reggie

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  • 3 more comments 
  • Miss Jolley Jan 12, 2009

    ive had a same problem but ive had the head gasket replaced and it hasnt changed the performance of it!!!

    sorry i couldnt help you!


  • bongoman54 Feb 24, 2009

    I have exactly the same problem ! except when trying to warm the engine it blow a hole in the radiator :-( did you manage to get this fixed on yours ? I tried bleeding it, thermostat, matrix, checked pipes. any help please.

  • Mark Salmon
    Mark Salmon Apr 27, 2009

    I HAVE THE SAME PROB IN OVER HEATING CANANY ONE HELP !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

  • Graham smith
    Graham smith Apr 03, 2014

    Try running with out thermostat

  • Graham smith
    Graham smith Apr 03, 2014

    Thermostat try running with it out

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No im a mechanic it sounds like that you have an air lock in the cooling system .i am familiar with ford freda and bongo and the design where the engine is is a bit far from the radiator ,so the problem with air locks magnifies.really the solution is just drain the water and refill it slowly while you are pressing and releasing,just repeat the action on the top radiator hose to get rid of any air trapping within the system,it's as simple as that really.you want it to have just water and no air as this will cause a blockage.

Posted on Nov 11, 2009

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My Bongo's been naughty like yours called the dealers and they said they had the same problem with a different persons Bongo.
They found in the end it was the water pump it had a very small hole and was drawing air in causing airlocks and the bongo overheated. If you open the expansion tank and theres more than normal back pressure.Id look into changing the water pump.

Posted on Mar 27, 2010

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Take the thermostat out complety and that should solve it i had same prob now its ok

Posted on May 13, 2009

  • kathleen sadler Oct 05, 2011

    but does your heater work ?

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Change cylinder gasket, do not forgat to reface cylinder head sure it is bended.

Posted on Jan 18, 2009

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Header bottle boiling up,new head new rad new water pump new gaskets new thermostsat,why did it just boil up again,my man is so peed off after putting new head on and every thing whats wrong.................

Posted on Oct 05, 2011

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  • Brian Noble Sep 09, 2012

    almost no one bleeds these vehicles correctly, down load the 'how to bleed PDF' and insist the garage follow the advice

  • Brian Noble Sep 09, 2012

    Also the plastic top of the radiater (called the tank) splits and leaks and sometimes bursts like a water melon. The answer is get a new tank in aluminim fitted by a radiater specialist. Then let the specialist bleed the vehicle.

  • Brian Noble Sep 09, 2012

    Forgot to add the overhating /bleeding correctly PDF is free on the Bongo Forum

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Put new head on mine with new water pump, gasket etc, and now the engine sounds like its detonating checked all timing marks, tried moving fuel pump but no change please help...

Posted on Aug 14, 2012

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Hi all, Is it easy to remove the cylinder head, Or does the whole engine have to come out,

Posted on Sep 19, 2009

  • kathleen sadler Oct 05, 2011

    easy to remove cylinder head just remove rocker cover pipes n hoses undo all head bolts but replace them with NEW because they are stretch bolts one use only.riggle and tug head comes off.check for cracks ,etc....

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