Head Gasket / Cracked Head.

matthenley · Post by **matthenley** » Wed Jan 02, 2013 11:52 am

Temperature gauge sounds a good idea.

Noticed today this is broken under drivers seat, towards the back:

What is this? Air intake temperature sensor? Another filter?

Northern Bongolow · Post by **Northern Bongolow** » Wed Jan 02, 2013 1:10 pm

its a one way valve.
it holds/exhausts the vacuum in the vac line from the cold start and egr solenoids into the air intake line to the turbo.
if this is broken it allows too much air into the air/fuel system, but also lets the vac go so may not operate the cold start on the fuel pump.

these are a common part on all mazda.s of similar age both diesel and petrol with egr fitted, scrappy will have them. or bongo breakers.

matthenley · Post by **matthenley** » Wed Jan 02, 2013 4:10 pm

Thanks Northern. Ordered one.

Had the Bongo running again. Bled properly, ran for 15 minutes (internal heaters on full) before all fans come on and temperature gauge fluctuates quickly between off and just-about-cold (only a couple of mm movement on the needle, but wildly doing so). White smoke/steam out of the exhaust and a steady hissing from the header tank. Radiator is still cold. None of the coolant pipes are particularly hot, only warm next to the engine. Heaters blowing warm.

What's your thoughts? Temperature sender? Solenoid that opens the radiator circuit when coolant is hot?

Northern Bongolow · Post by **Northern Bongolow** » Wed Jan 02, 2013 4:35 pm

hi,
phone me for a chat if you wish, i will pm you my number.

Northern Bongolow · Post by **Northern Bongolow** » Wed Jan 02, 2013 9:01 pm

had a phone chat with matt.
just to talk though the bleed process as per the three vids on youtube by bwitched blingo. and to talk through how to check flow through both heater matrix and the importance of flow through these.

hope it helps. good luck.

matthenley · Post by **matthenley** » Wed Jan 02, 2013 9:08 pm

Yeah thanks loads for the chat. Put a hose pipe in the pipes under the rear heater. Quite a bit of rusty water came out. Then it went dark so finished for the day.

Found a leak in the bulging hose while running the engine this time, although this is new. Next job will be fit the replacement hose for this, when it gets here, then refill and bleed properly as video: http://www.youtube.com/watch?v=jRAKOSxgbKo

Northern Bongolow · Post by **Northern Bongolow** » Wed Jan 02, 2013 9:15 pm

thats good that you have maybe found the cause.s ,now your moving forward.

Head Gasket / Cracked Head.

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