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Old 11-12-2019, 06:43 AM
TommyT578 TommyT578 is offline
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Default Coolant blow back, engine over heating

Hi Guys,
im new to the forum and have recently just bought my first B2500. Absolutely loving it until a couple of weeks ago.
driving to work my heating went cold and the engine temp rose and hit the limit, I pulled over and a large percentage of coolant had been forced out of the reservoir breather/ overflow bottle.
topped it up and managed to recover it with assistance from the AA.
I replaced the thermostat as that was my first thought, it seemed to help for a little bit and the temp fluctuated up and down for a few times with the heating going hot and cold, but eventually ended up doing exactly the same again, coolant everywhere and fully overheated.
So I started reading up on it and worked out that it could be many things. So to save time and the ball ache of it all decided to change everything.
i changed, thermostat again, waterpump, radiator and cap and both top and bottom radiator hoses. Bled the system as per the workshop manual and it has done exactly the same again. Engine gets up to temp heating gets hot then it goes cold and the temp starts to rise, once it has risen the heating then gets hot again. There is very little pressure in the bottom radiator hose which is cold and the radiator itself is cold on the bottom three quarters.
I tried running it with no thermostat and the same thing happened again, except this time there was no heat from the heater at all, the engine got hot and blew the coolant again, the bottom radiator hose was cool but slightly warmer than before and also had pressure in it.
i read somewhere that a chap had had a similar issue and had gone through several thermostats until he bought an OEM one, so I now have one on order and it should be here on Wednesday although I am not 100% that will fix it..
Iím absolutely stumped and would appreciate any help if possible.
many thanks
Tom

forgot to say it is a 2000 2.5 td RHD with no A/C fitted
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Mazda B2500 2.5l TD 2000yr right hand drive
Basically overhauling it whilst using it as a daily driver.....
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  #2  
Old 11-12-2019, 09:51 AM
tomboy tomboy is offline
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Default Re: Coolant blow back, engine over heating

With it blowing coolant out the over flow tank, my first guess would be a bad head gasket.
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Old 11-12-2019, 11:45 AM
TommyT578 TommyT578 is offline
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Default Re: Coolant blow back, engine over heating

Thanks Tomboy

I did think that however there is no oil in the coolant, residue in the oil or any white smoke from the exhaust!
Could it still be a gasket if it isnít showing these signs as well?
Thanks
Tom
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Mazda B2500 2.5l TD 2000yr right hand drive
Basically overhauling it whilst using it as a daily driver.....
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Old 11-12-2019, 02:11 PM
tomboy tomboy is offline
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Default Re: Coolant blow back, engine over heating

A compression leak between the cyl and water jacket will put pressure in the system without the other things you mentioned.
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Old 11-12-2019, 02:48 PM
TommyT578 TommyT578 is offline
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Default Re: Coolant blow back, engine over heating

Ok, thank you very much I shall try it and will let you know the outcome.
Thanks again
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Mazda B2500 2.5l TD 2000yr right hand drive
Basically overhauling it whilst using it as a daily driver.....
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Old 11-18-2019, 11:08 AM
tomw0 tomw0 is offline
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Default Re: Coolant blow back, engine over heating

Two thoughts... Does the upper radiator hose stay cool, and then, almost all at once, get hot? If so, the thermostat is working properly. Does the radiator tank at the top get hot?
If your radiator is plugged, it will not flow coolant and you will overheat. The lower hose should get warm over time as the heated coolant flows from top to bottom in the tubes. If the hose stays cold, it is not flowing coolant.
If the stat is not working properly, make sure the rubber gasket is seated, and the stat held in place by the 'feet' being bent into position in the trough around the stat housing, to be held by the gasket and block when installed in place and bolts tightened.
The heater will get coolant flow when the engine runs. It will need to have the air bubbles purged from the 'high spot' in the heater hoses. You can raise one up, and the bubble will form there, and you can 'work' it to one end or the other to be burped out.
tom
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